Lincoln Navigator Manuals

Lincoln Navigator: Four-Wheel Drive Systems / DTC Chart and Pinpoint Tests - Vehicles With: 1-Speed Torque On Demand Transfer Case. Diagnosis and Testing

Lincoln Navigator 2018-2025 Workshop Manual / Automatic Transmission / Four-Wheel Drive Systems / DTC Chart and Pinpoint Tests - Vehicles With: 1-Speed Torque On Demand Transfer Case. Diagnosis and Testing

Diagnostic Trouble Code (DTC) Chart

Diagnostics in this manual assume a certain skill level and knowledge of Ford-specific diagnostic practices.
REFER to: Diagnostic Methods (100-00 General Information, Description and Operation).


Module DTC Description Action
ATCM U0140:00 Lost Communication With Body Control Module: No Sub Type Information GO to Pinpoint Test C
ATCM U2002:9E Switch: Stuck On GO to Pinpoint Test F
ATCM U2009:9E Rotary Encoder: Stuck On GO to Pinpoint Test F
ATCM U3000:49 Control Module: Internal Electronic Failure GO to Pinpoint Test F
PCM U0100:00 Lost Communication With ECM/PCM 'A': No Sub Type Information GO to Pinpoint Test C
TCCM P0562:00 System Voltage Low: No Sub Type Information GO to Pinpoint Test A
TCCM P0563:00 System Voltage High: No Sub Type Information GO to Pinpoint Test A
TCCM P06B8:00 Internal Control Module Non-Volatile Random Access Memory (NVRAM) Error: No Sub Type Information GO to Pinpoint Test F
TCCM P1825:00 4-Wheel Drive Clutch Relay Open Circuit: No Sub Type Information GO to Pinpoint Test B
TCCM P1826:00 4-Wheel Drive Low Clutch Relay Circuit To Battery: No Sub Type Information GO to Pinpoint Test B
TCCM P1827:00 4-Wheel Drive Low Clutch Relay Circuit To Ground: No Sub Type Information GO to Pinpoint Test B
TCCM U0121:00 Lost Communication With Anti-Lock Brake System (ABS) Control Module 'A': No Sub Type Information GO to Pinpoint Test C
TCCM U0138:00 Lost Communication with All Terrain Control Module: No Sub Type Information GO to Pinpoint Test C
TCCM U0140:00 Lost Communication With Body Control Module: No Sub Type Information GO to Pinpoint Test C
TCCM U0418:00 Invalid Data Received from Brake System Control Module 'A': No Sub Type Information GO to Pinpoint Test D
TCCM U0439:00 Invalid Data Received From All Terrain Control Module: No Sub Type Information GO to Pinpoint Test D
TCCM U2300:54 Central Configuration: Missing Calibration GO to Pinpoint Test E
TCCM U2300:55 Central Configuration: Not Configured GO to Pinpoint Test E
TCCM U2300:56 Central Configuration: Invalid/Incompatible Configuration GO to Pinpoint Test E
TCCM U2300:64 Central Configuration: Signal Plausibility Failure GO to Pinpoint Test E
TCCM U3000:04 Control Module: System Internal Failures GO to Pinpoint Test F
TCCM U3000:46 Control Module: Calibration/Parameter Memory Failure GO to Pinpoint Test F
TCCM U3000:49 Control Module: Internal Electronic Failure GO to Pinpoint Test F
TCCM U300D:11 Ignition Input On/Start: Circuit Short To Ground GO to Pinpoint Test G
TCM U0101:00 Lost Communication with TCM: No Sub Type Information GO to Pinpoint Test C

Global Customer Symptom Code (GCSC) Chart

Diagnostics in this manual assume a certain skill level and knowledge of Ford-specific diagnostic practices.


Symptom Action
Start/Run/Move > Moving > 4 x 4 Function > Inoperative GO to Pinpoint Test H
Start/Run/Move > Noise > Moving/Driving > Always GO to Pinpoint Test I
Start/Run/Move > Noise > Moving/Driving > Always GO to Pinpoint Test J
Start/Run/Move > Noise > Moving/Driving > Always GO to Pinpoint Test K
Start/Run/Move > Noise > Moving/Driving > Always GO to Pinpoint Test L

Symptom Chart

Diagnostics in this manual assume a certain skill level and knowledge of Ford-specific diagnostic practices.
REFER to: Diagnostic Methods (100-00 General Information, Description and Operation).

Condition Actions
The AWD module does not respond to the diagnostic scan tool  
REFER to: Controller Area Network (CAN) Module Communications Network - System Operation and Component Description (418-00A Controller Area Network (CAN) Module Communications Network, Description and Operation).
The ATCM does not respond to the diagnostic scan tool  
REFER to: Controller Area Network (CAN) Module Communications Network - System Operation and Component Description (418-00A Controller Area Network (CAN) Module Communications Network, Description and Operation).
Unable to achieve flat tow (neutral tow) mode   GO to Pinpoint Test H

Symptom Chart — NVH

NVH symptoms should be identified using the diagnostic tools that are available. For a list of these tools, an explanation of their uses and a glossary of common terms,
REFER to: Noise, Vibration and Harshness (NVH) (100-04 Noise, Vibration and Harshness, Diagnosis and Testing).
Since it is possible any one of multiple systems may be the cause of a symptom, it may be necessary to use a process of elimination type of diagnostic approach to pinpoint the responsible system.

Condition Actions
The transfer case makes noise   GO to Pinpoint Test I
Transfer case whine - noise at all ranges   GO to Pinpoint Test J
Transfer case growl/rumble - noise at all ranges   GO to Pinpoint Test K
Transfer case scraping/grating - noise at all ranges   GO to Pinpoint Test L

Pinpoint Tests


PINPOINT TEST A: P0562:00, P0563:00

Refer to Wiring Diagrams Cell 34 for schematic and connector information.

Normal Operation and Fault Conditions

If the TCCM observes an overpower or underpower voltage condition, a DTC is set and all TCCM outputs are turned off.

DTC Fault Trigger Conditions

DTC Description Fault Trigger Condition
TCCM P0562:00 System Voltage Low: No Sub Type Information This TCCM sets when the TCCM Detect battery voltage less than 9 volts for 5 seconds or more at the TCCM .
TCCM P0563:00 System Voltage High: No Sub Type Information This TCCM sets when the TCCM Detect battery voltage greater than 16 volts for 5 seconds or more at the TCCM .

Possible Sources

  • Fuse
  • Charging system
  • Open TCCM Ground
  • Open TCCM Power circuit
  • TCCM Power circuit short to ground
  • TCCM
A1 RETRIEVE ALL CMDTC (CONTINUOUS MEMORY DIAGNOSTIC TROUBLE CODE) IN ALL MODULES

NOTE: DTC P0562:00 or P0563:00 can be set if the vehicle has been recently jump started, the battery has been recently charged or the battery has been discharged. The battery may become discharged due to excessive load(s) on the charging system from aftermarket accessories or if the battery has been left unattended with the accessories on.

  • Ignition ON.
  • Enter the following diagnostic mode: Retrieve all CMDTC .

Is DTC P0562:00 or P0563:00 present in one or more modules or P0563, P0620, P0625, P0626 or P065B present in the PCM ?
Yes For diagnosis of the battery and charging system,
REFER to: Charging System - 3.5L EcoBoost (272kW/370PS) (414-00 Charging System - General Information, Diagnosis and Testing).
No GO to A2

A2 CHECK VOLTAGE AND GROUND TO THE TCCM (TRANSFER CASE CONTROL MODULE)
  • Ignition OFF.
  • Disconnect TCCM C2371B .
  • Ignition ON
  • Measure:
    Click to display connectors
    Positive Lead Measurement / Action Negative Lead
      C2371B-7   C2371B-3

Is the voltage between 11 and 14 volts?
Yes GO to A4
No GO to A3

A3 CHECK VOLTAGE TO THE TCCM (TRANSFER CASE CONTROL MODULE)
  • Measure:
    Click to display connectors
    Positive Lead Measurement / Action Negative Lead
      C2371B-7   Ground

Is the voltage between 11 and 14 volts?
Yes REPAIR the ground circuit. CLEAR all CMDTC .
No VERIFY BCMC fuse 13 (10A) is OK. If OK, REPAIR the open circuit. If not OK, REFER to the Wiring Diagrams manual to identify possible causes of the circuit short. CLEAR all CMDTC .

A4 CHECK FOR CORRECT TCCM (TRANSFER CASE CONTROL MODULE) 4WD (FOUR-WHEEL DRIVE) OPERATION
  • Ignition OFF.
  • Disconnect and inspect all TCCM connectors.
  • Check for the following:
    • corrosion (install new connector or terminals - clean module pins)
    • damaged or bent pins - install new terminals/pins
    • pushed-out pins - install new pins as necessary
  • Connect TCCM connectors. Make sure they seat and latch correctly.
  • Operate the system and verify the concern is still present.

Is the concern still present?
Yes CHECK OASIS for any applicable service articles: TSB , GSB , SSM , or FSA . If a service article exists for this concern, DISCONTINUE this test and FOLLOW the service article instructions. If no service articles address this concern, INSTALL a new TCCM .
REFER to: Transfer Case Control Module (TCCM) (307-07A Four-Wheel Drive Systems, Removal and Installation).
No The system is operating correctly at this time. Concern may have been caused by a loose or corroded connector. ADDRESS the root cause of the connector or pin issues.

PINPOINT TEST B: FOUR-WHEEL DRIVE (4WD) CLUTCH FIELD COIL - ELECTRICAL

Refer to Wiring Diagrams Cell 34 for schematic and connector information.

Normal Operation and Fault Conditions

When the transfer case is in 4A and 4H modes, the TCCM provides a PWM voltage to the transfer case clutch field coil. The energized field coil moves a ball and ramp cam to engage a clutch as necessary to provide torque to the front axle.

The TCCM 4WD clutch field coil driver monitors the circuit for open circuit, short to power, and short to ground. If an electrical fault is detected, the TCCM will store a DTC .

DTC Fault Trigger Conditions

DTC Description Fault Trigger Condition
TCCM P1825:00 4-Wheel Drive Clutch Relay Open Circuit: No Sub Type Information This DTC sets when TCCM detect an open circuit. The TCCM disables transfer case clutch operation.
TCCM P1826:00 4-Wheel Drive Low Clutch Relay Circuit To Battery: No Sub Type Information This DTC sets when TCCM detect a short to voltage. Transfer case clutch operation, though disabled by the TCCM , is fully engaged when this DTC is present.
TCCM P1827:00 4-Wheel Drive Low Clutch Relay Circuit To Ground: No Sub Type Information This DTC sets when TCCM detect a short to ground. The TCCM disables transfer case clutch operation.

Possible Sources

  • Clutch control circuit short to ground
  • Clutch control open circuit
  • Clutch control circuit short to voltage
  • Clutch control ground open circuit
  • Clutch field coil
B1 CHECK FOR TCCM (TRANSFER CASE CONTROL MODULE) DTC (DIAGNOSTIC TROUBLE CODE)
  • Ignition ON.
  • Enter the following diagnostic mode on the scan tool: TCCM KOEO Self-Test.

Are any DTC s present?
Yes For DTC P1825:00, GO to B3 For DTC P1826:00, GO to B4 For DTC P1827:00, GO to B2. For all other DTC refer to the DTC chart above.
No The 4WD clutch field coil is electrically sound at this time.

B2 CHECK CLUTCH CONTROL CIRCUIT FOR A SHORT TO GROUND
  • Ignition OFF.
  • Disconnect Transfer Case C1290 .
  • Disconnect TCCM C2371B .
  • Measure:
    Click to display connectors
    Positive Lead Measurement / Action Negative Lead
      C1290-2   Ground

Is the resistance greater than 10,000 ohms?
Yes GO to B3
No REPAIR the short to ground.

B3 CHECK CLUTCH CONTROL CIRCUIT FOR AN OPEN
  • Ignition OFF.
  • Disconnect Transfer Case C1290 .
  • Disconnect TCCM C2371B .
  • Measure:
    Positive Lead Measurement / Action Negative Lead
      C1290-2   C2371B-10

Is the resistance less than 3 ohms?
Yes GO to B4
No REPAIR the open circuit.

B4 CHECK CLUTCH CONTROL CIRCUIT FOR A SHORT TO VOLTAGE
  • Ignition OFF.
  • Disconnect Transfer Case C1290 .
  • Disconnect TCCM C2371B .
  • Ignition ON.
  • Measure:
    Click to display connectors
    Positive Lead Measurement / Action Negative Lead
      C1290-2   Ground

Is any voltage present?
Yes REPAIR the short to voltage.
No GO to B5

B5 CHECK CLUTCH GROUND CIRCUIT FOR AN OPEN
  • Ignition OFF.
  • Disconnect Transfer Case C1290 .
  • Measure:
    Positive Lead Measurement / Action Negative Lead
      C1290-1   Ground

Is the resistance less than 3 ohms?
Yes CHECK OASIS for any applicable service articles: TSB , GSB , SSM , or FSA . If a service article exists for this concern, DISCONTINUE this test and FOLLOW the service article instructions. If no service articles address this concern, INSTALL a new transfer case clutch coil.
REFER to: Transfer Case - Vehicles With: 1-Speed Torque On Demand Transfer Case (307-07B Transfer Case, Disassembly and Assembly).
No REPAIR the open circuit.

PINPOINT TEST C: LOST COMMUNICATION WITH ANOTHER MODULE

Refer to Wiring Diagrams Cell 34 for schematic and connector information.

Normal Operation and Fault Conditions

The TCCM communicates directly with the PCM and ABS on the FD-CAN network. The TCCM communicates with the ATCM module on the HS-CAN2 network via the GWM . The TCCM communicates with the BCM on the HS-CAN1 network via the GWM . The TCCM communicates with the IPC on the HS-CAN3 network via the GWM .

The TCCM sets a DTC for lost communication when it has not received messages from the suspect module for more than 5 seconds with ignition in RUN and battery voltage in range. Other modules that require data from the suspect module may also set a lost communication DTC if the fault is common to both receiving modules.

DTC Fault Trigger Conditions

DTC Description Fault Trigger Condition
ATCM U0140:00 Lost Communication With Body Control Module: No Sub Type Information Sets in continuous memory in the ATCM if data messages received from the ATCM through the ATCM are missing for 5 seconds or longer.
PCM U0100:00 Lost Communication With ECM/PCM 'A': No Sub Type Information Sets in continuous memory in the TCCM if powertrain data messages received from the PCM over the FD-CAN are missing for longer than 5 seconds with ignition in RUN and battery voltage in range.
TCM U0101:00 Lost Communication with TCM: No Sub Type Information Sets in continuous memory in the TCCM if powertrain data messages received from the TCM over the FD-CAN are missing for longer than 5 seconds with ignition in RUN and battery voltage in range.
TCCM U0121:00 Lost Communication With Anti-Lock Brake System (ABS) Control Module 'A': No Sub Type Information Sets in continuous memory in the TCCM if ABS module data messages received from the ABS module over the FD-CAN are missing for longer than 5 seconds.
TCCM U0138:00 Lost Communication with All Terrain Control Module: No Sub Type Information Sets in continuous memory in the TCCM if data messages received from the ATCM through the GWM are missing for 5 seconds or longer.
TCCM U0140:00 Lost Communication With Body Control Module: No Sub Type Information Sets in continuous memory in the TCCM if data messages received from the BCM through the GWM are missing for 5 seconds or longer.

Possible Sources

  • Communication concern
  • Battery voltage concern
  • Network fault
  • Intermittent network traffic jam
  • PCM , TCM , ABS , ATCM , BCM , IPC
C1 CHECK FOR LOST COMMUNICATION DTC (DIAGNOSTIC TROUBLE CODE) IN OTHER MODULES
  • Enter the following diagnostic mode: Retrieve al CMDTC .

Do any other modules on the vehicle also have a Lost Communication DTC with the suspect module?
Yes
REFER to: Controller Area Network (CAN) Module Communications Network (418-00A Controller Area Network (CAN) Module Communications Network, Diagnosis and Testing).
No GO to C2

C2 REVIEW CMDTC (CONTINUOUS MEMORY DIAGNOSTIC TROUBLE CODE) FOR LOW VOLTAGE DTC (DIAGNOSTIC TROUBLE CODE)
  • Review all module CMDTC for low voltage DTC

Do any modules have a low voltage DTC set?
Yes Resolve all vehicle voltage concerns.
REFER to: Charging System - 3.5L EcoBoost (272kW/370PS) (414-00 Charging System - General Information, Diagnosis and Testing).
No GO to C3

C3 INSPECT FD-CAN (FLEXIBLE DATA RATE CONTROLLER AREA NETWORK) CONNECTORS

  • Refer to Wiring Diagrams Cell 14 for schematic and connector information.
    DISCONNECT and INSPECT the FD-CAN connectors between the TCCM or GWM and the suspect module
  • Repair:
    • corrosion (install new connector or terminals - clean module pins)
    • damaged or bent pins - install new terminals/pins
    • pushed-out pins - install new pins as necessary
  • Connect all connectors. Make sure each connector seats and latches correctly.
  • Operate the system and verify the concern is still present.

Is the concern still present?
Yes CHECK OASIS for any applicable service articles: TSB , GSB , SSM , or FSA . If a service article exists for this concern, DISCONTINUE this test and FOLLOW the service article instructions. If no service articles address this concern, INSTALL a new suspect module.
For U0100,
   Click here to access Guided Routine (PCM).
REFER to: Powertrain Control Module (PCM) (303-14 Electronic Engine Controls - 3.5L EcoBoost (272kW/370PS), Removal and Installation). For U0101, INSTALL a new TCM .
REFER to: DTC Chart and Pinpoint Tests - 3.5L EcoBoost (272kW/370PS) (307-01 Automatic Transmission - 10-Speed Automatic Transmission – 10R80, Diagnosis and Testing). For U0121, INSTALL a new ABS
REFER to: Electric Brake Booster (EBB) (206-09 Anti-Lock Brake System (ABS) and Stability Control, Removal and Installation). For U0138, INSTALL a new ATCM .
REFER to: All Terrain Control Module (ATCM) (307-07A Four-Wheel Drive Systems, Removal and Installation). For U0140, INSTALL a new BCM
REFER to: Body Control Module (BCM) (419-10 Multifunction Electronic Modules, Removal and Installation).
No The system is operating correctly at this time. The concern may have been caused by module connections. ADDRESS the root cause of any connector or pin issues.

PINPOINT TEST D: INVALID DATA RECEIVED FROM ANOTHER MODULE

Refer to Wiring Diagrams Cell 34 for schematic and connector information. Refer to Wiring Diagrams Cell 14 for schematic and connector information.

Normal Operation and Fault Conditions

The TCCM expects to receive network data from other modules on the FD-CAN . The TCCM and ATCM will set a DTC when it receives an invalid or incomplete message from another module. Incomplete or corrupted messages typically result from high network traffic preventing the complete message from being received within the calibrated time limit.

DTC Fault Trigger Conditions

DTC Description Fault Trigger Condition
TCCM U0418:00 Invalid Data Received from Brake System Control Module 'A': No Sub Type Information The TCCM received an invalid wheel speed message data from the ABS . Mode changes to or from 4L may be prevented when this DTC is present.
TCCM U0439:00 Invalid Data Received From All Terrain Control Module: No Sub Type Information The TCCM received an invalid mode selection message data from the ATCM . mode changes may be prevented when this DTC is present.

Possible Sources

  • High network traffic event
  • Intermittent network connection
  • Suspect module
D1 CHECK SUSPECT MODULE FOR DTC (DIAGNOSTIC TROUBLE CODE)
  • Enter the following diagnostic mode: On Demand and CMDTC self-test for the suspect module.
  • Road test the vehicle.

Are any DTC set in the suspect module?
Yes DIAGNOSE and REPAIR all DTC in the suspect module.
No GO to D2

D2 ATTEMPT TO DUPLICATE THE DTC (DIAGNOSTIC TROUBLE CODE)
  • Enter the following diagnostic mode: Clear and Retest the TCCM CMDTC self-test.
  • Road test the vehicle.
  • Enter the following diagnostic mode: TCCM CMDTC self-test.

Did the invalid data DTC set again?
Yes GO to D3
No The system is operating correctly at this time. The concern may have been caused by a high network traffic event.

D3 INSPECT FD-CAN (FLEXIBLE DATA RATE CONTROLLER AREA NETWORK) CONNECTORS

  • Refer to Wiring Diagrams Cell 34 for schematic and connector information.
  • DISCONNECT and INSPECT the FD-CAN connectors between the TCCM and the suspect module.
  • Check for the following:
    • corrosion (install new connector or terminals - clean module pins).
    • damaged or bent pins - install new terminals/pins.
    • pushed-out pins - install new pins as necessary.
  • CONNECT all connectors. Make sure each connector seats and latches correctly.
  • Operate the system and verify if the concern is still present.

Is the concern still present?
Yes CHECK OASIS for any applicable service articles: TSB , GSB , SSM , or FSA . If a service article exists for this concern, DISCONTINUE this test and FOLLOW the service article instructions. If no service articles address this concern, INSTALL a new suspect module.
For U0418, INSTALL a new ABS .
REFER to: Electric Brake Booster (EBB) (206-09 Anti-Lock Brake System (ABS) and Stability Control, Removal and Installation). For U0439, INSTALL a new ATCM .
REFER to: All Terrain Control Module (ATCM) (307-07A Four-Wheel Drive Systems, Removal and Installation).
No The system is operating correctly at this time. The concern may have been caused by module or network connections. ADDRESS the root cause of any connector or pin issues.

PINPOINT TEST E: CENTRAL CONFIGURATION FAULTS

Refer to Wiring Diagrams Cell 14 for schematic and connector information.

Normal Operation and Fault Conditions

The TCCM receives VID (vehicle identification) block configuration data from the BCM via the GWM over the FD-CAN . This data includes items like tire size, axle ratio, and other vehicle options.

DTC Fault Trigger Conditions

DTC Description Fault Trigger Condition
TCCM U2300:54 Central Configuration: Missing Calibration The TCCM central configuation software has detected an internal data error.
TCCM U2300:55 Central Configuration: Not Configured The TCCM central configuation software has detected an internal data error.
TCCM U2300:56 Central Configuration: Invalid/Incompatible Configuration The TCCM central configuation software has detected an internal data error.
TCCM U2300:64 Central Configuration: Signal Plausibility Failure The TCCM central configuation software has detected an internal data error.

Possible Sources

  • BCM faults
  • TCCM
E1 CHECK FOR BCM (BODY CONTROL MODULE) DTC (DIAGNOSTIC TROUBLE CODE)
  • Enter the following diagnostic mode: BCM On Demand and CMDTC self-test.

Are any BCM DTC present?
Yes DIAGNOSE and REPAIR all DTC in the BCM . If no service articles address this concern, INSTALL a new BCM .
REFER to: Body Control Module (BCM) (419-10 Multifunction Electronic Modules, Removal and Installation).
No GO to E2

E2 ATTEMPT TO CORRECT THE DATA ERROR
  • Enter the following diagnostic mode: BCM automatic as-built programming.
  • Ignition OFF.
  • Ignition ON.
  • Enter the following diagnostic mode: TCCM Clear and retest CMDTC .

Is the U2300:xx DTC present?
Yes CHECK OASIS for any applicable service articles: TSB , GSB , SSM , or FSA . If a service article exists for this concern, DISCONTINUE this test and FOLLOW the service article instructions. If no service articles address this concern, INSTALL a new TCCM .
REFER to: Transfer Case Control Module (TCCM) (307-07A Four-Wheel Drive Systems, Removal and Installation).
No The repair is complete.

PINPOINT TEST F: CONTROL MODULE INTERNAL FAULTS

Normal Operation and Fault Conditions

The TCCM and ATCM monitor the internal circuitry and memory for errors. If a fault is detected multiple times, a DTC is set.

DTC Fault Trigger Conditions

DTC Description Fault Trigger Condition
ATCM U2009:9E Rotary Encoder: Stuck On Sets when the ATCM detect rotary encoder stuck On.
ATCM U2002:9E Switch: Stuck On Sets when the ATCM detect switch stuck On.
ATCM U3000:49 Control Module: Internal Electronic Failure This DTC sets if voltage levels vary across different internal circuit. INSTALL a new ATCM .
REFER to: All Terrain Control Module (ATCM) (307-07A Four-Wheel Drive Systems, Removal and Installation).
TCCM P06B8:00 Internal Control Module Non-Volatile Random Access Memory (NVRAM) Error: No Sub Type Information This DTC sets if all NVRAM blocks have an error. The DTC is permanent. INSTALL a new TCCM .
REFER to: Transfer Case Control Module (TCCM) (307-07A Four-Wheel Drive Systems, Removal and Installation).
TCCM U3000:04 Control Module: System Internal Failures This DTC sets if an internal error is detected while the clutch is on. INSTALL a new TCCM .
REFER to: Transfer Case Control Module (TCCM) (307-07A Four-Wheel Drive Systems, Removal and Installation).
TCCM U3000:46 Control Module: Calibration/Parameter Memory Failure This DTC sets if the two-point motor or clutch calibration is invalid. INSTALL a new TCCM .
REFER to: Transfer Case Control Module (TCCM) (307-07A Four-Wheel Drive Systems, Removal and Installation).
TCCM U3000:49 Control Module: Internal Electronic Failure This DTC sets if voltage levels vary across different internal circuit. INSTALL a new TCCM .
REFER to: Transfer Case Control Module (TCCM) (307-07A Four-Wheel Drive Systems, Removal and Installation).

Possible Sources

  • TCCM
  • ATCM
Diagnostic steps are not provided for this symptom or DTC.  REFER to: Diagnostic Methods (100-00 General Information, Description and Operation).
PINPOINT TEST G: U300D:11

Refer to Wiring Diagrams Cell 34 for schematic and connector information.

Normal Operation and Fault Conditions

The TCCM receives ignition switch position status from the hardwired run/start input to TCCM and the ignition switch position status message communicated by the GWM over the FD-CAN . The ignition switch position status message originates from the BCM which communicates the ignition switch position status over the HS-CAN1 . For information regarding network messaging, REFER to: Controller Area Network (CAN) Module Communications Network - System Operation and Component Description (418-00A Controller Area Network (CAN) Module Communications Network, Description and Operation).

DTC Fault Trigger Conditions

DTC Description Fault Trigger Condition
TCCM U300D:11 Ignition Input On/Start: Circuit Short To Ground This DTC sets when the ignition switch position status message broadcast by the BCM over the HS-CAN does not match the hardwired run/start input circuit voltage signal at the TCCM .

Possible Sources

  • VPWR Short to Ground
  • VPWR Open circuit
  • VPWR Short to voltage
  • BCM
G1 CHECK THE TCCM (TRANSFER CASE CONTROL MODULE) IGNITION CIRCUIT FUSE
  • Inspect BCMC Fuse 13 (10A).

Is the fuse OK?
Yes GO to G2
No REPAIR short to ground. INSTALL new fuse.

G2 CHECK THE TCCM (TRANSFER CASE CONTROL MODULE) IGNITION CIRCUIT FOR VOLTAGE
  • Ignition OFF.
  • Disconnect TCCM C2371A .
  • Ignition ON.
  • Measure:
    Click to display connectors
    Positive Lead Measurement / Action Negative Lead
      C2371A-7   Ground

Is the voltage greater than 10v?
Yes GO to G3
No REPAIR open circuit between the BCMC and the TCCM

G3 CHECK THE TCCM (TRANSFER CASE CONTROL MODULE) IGNITION CIRCUIT FOR SHORT TO VOLTAGE
  • Ignition OFF.
  • Disconnect TCCM C2371A .
  • Measure:
    Click to display connectors
    Positive Lead Measurement / Action Negative Lead
      C2371A-7   Ground

Is any voltage present?
Yes REPAIR the short to voltage.
No The TCCM is receiving the correct Ignition status. VERIFY BCM is broadcasting correct ignition status. If no service articles address this concern, INSTALL a new BCM .
REFER to: Body Control Module (BCM) (419-10 Multifunction Electronic Modules, Removal and Installation).

G4 CHECK THE TCCM (TRANSFER CASE CONTROL MODULE) IGNITION CIRCUIT FOR SHORT TO VOLTAGE
  • Ignition OFF.
  • Disconnect TCCM C2371A .
  • Measure:
    Click to display connectors
    Positive Lead Measurement / Action Negative Lead
      C2371A-7   Ground

Is any voltage present?
Yes REPAIR the short to voltage.
No The TCCM is receiving the correct Ignition status. VERIFY BCM is broadcasting correct ignition status. If no service articles address this concern, INSTALL a new BCM .
REFER to: Body Control Module (BCM) (419-10 Multifunction Electronic Modules, Removal and Installation).

PINPOINT TEST H: UNABLE TO ACHIEVE NEUTRAL FLAT TOW MODE

Normal Operation and Fault Conditions

1-Speed Torque on Demand transfer case vehicles cannot be flat towed with any of the wheels on the ground. Vehicle or transmission damage will occur. REFER to: Neutral Flat Tow Activation and Deactivation (307-07A Four-Wheel Drive Systems, General Procedures).

Possible Sources

  • Wiring, terminals or connectors
  • HS-CAN
  • IPC
  • TCCM
  • Ignition switch and/or circuitry
  • Door ajar switch
Diagnostic steps are not provided for this symptom or DTC.  REFER to: Diagnostic Methods (100-00 General Information, Description and Operation).
PINPOINT TEST I: THE TRANSFER CASE MAKES NOISE

Normal Operation and Fault Conditions

  • VERIFY all tires inflation pressures are correct.
    • VERIFY all tires and wheels are the same.
    • CHECK tire tread wear to see if there is more than 1.6 mm (0.062 in) or 2/32 inch difference in tread wear between front and rear. INTERCHANGE one front wheel and one rear wheel. ROAD TEST again.
  • CHECK the planetary gears, the bearings, the upper and lower drive sprockets and drive chain for damage. INSTALL new parts as necessary, REFER to: Transfer Case (307-07B Transfer Case, Diagnosis and Testing).
  • CHECK that the transfer case is filled to the correct level and with the specified fluid. REFER to: Transfer Case Draining and Filling (307-07B Transfer Case, General Procedures).

Possible Sources

  • Tire inflation pressure
  • Tire and wheel size
  • Tire tread wear
  • Internal components
  • Fluid level
Diagnostic steps are not provided for this symptom or DTC.  REFER to: Diagnostic Methods (100-00 General Information, Description and Operation).
PINPOINT TEST J: TRANSFER CASE WHINE - NOISE AT ALL RANGES

Normal Operation and Fault Conditions

  • CHECK that the transfer case is filled to the correct level and with the specified fluid. REFER to: Transfer Case Draining and Filling (307-07B Transfer Case, General Procedures).
  • DISASSEMBLE the transfer case. CHECK the oil pump for wear or damage. REPAIR as necessary. REFER to: Transfer Case - Vehicles With: 1-Speed Torque On Demand Transfer Case (307-07B Transfer Case, Disassembly and Assembly).
  • CONFIRM that the tires and wheels are correct for the vehicle. CHECK that the tire inflation pressures are correct.

Possible Sources

  • Incorrect fluid level or fluid quality
  • Worn oil pump
  • Under-inflated or oversized tires
Diagnostic steps are not provided for this symptom or DTC.  REFER to: Diagnostic Methods (100-00 General Information, Description and Operation).
PINPOINT TEST K: TRANSFER CASE GROWL/RUMBLE — NOISE AT ALL RANGES

Normal Operation and Fault Conditions

  • DISASSEMBLE the transfer case. CHECK the bearings or planetary gear for wear or damage. REPAIR as necessary. REFER to: Transfer Case (307-07B Transfer Case, Diagnosis and Testing).

Possible Sources

  • Damaged or worn bearings or planetary gear
Diagnostic steps are not provided for this symptom or DTC.  REFER to: Diagnostic Methods (100-00 General Information, Description and Operation).
PINPOINT TEST L: TRANSFER CASE SCRAPING/GRATING — NOISE AT ALL RANGES

Normal Operation and Fault Conditions

  • DISASSEMBLE the transfer case. CHECK the drive chain for wear or damage. REPAIR as necessary. REFER to: Transfer Case (307-07B Transfer Case, Diagnosis and Testing).

Possible Sources

  • Excessively stretched drive chain hitting the case
Diagnostic steps are not provided for this symptom or DTC.  REFER to: Diagnostic Methods (100-00 General Information, Description and Operation).

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