Pinpoint Test N: DTC U0301

WARNING: This page is about a different variant/trim than selected.

Normal Operation and Fault Conditions

On some vehicles, it is possible to install a TCM that is compatible with the drivetrain, but not with shift by wire. A TCM that is compatible with shift by wire will send out a compatibility communication signal to the GSM. Each time the GSM wakes up from sleep mode, it will check to make sure that the TCM installed in the vehicle is compatible with shift by wire.

DTC Fault Trigger Conditions

DTC	Description	Fault Trigger Condition
GSM U0301:00	Software Incompatibility with ECM/PCM: No Sub Type Information	ThisDTC indicates the TCM software is not compatible with the GSM.

Possible Sources

Incorrect or corrupted TCM calibration.

N1 CHECK ALL MODULES FOR LOW VOLTAGE DIAGNOSTIC TROUBLE CODES (DTCS)
- Using a diagnostic scan tool, review all continuous memory diagnostic trouble codes (CMDTCs) in all modules.
Is a low voltage DTC set in any module?

Yes RESOLVE the vehicle voltage concern first. REFER to: Charging System - 5.2L 32V Ti-VCT - Supercharged .

No GO to N2

N2 CHECK FOR CAUSES OF COMMUNICATION CONCERNS

NOTE: If new modules were installed prior to the DTC being set, the module configuration can be incorrectly set during the PMI or the PMI may not have been carried out.
- CHECK the vehicle service history for recent service actions related to the TCM. If recent service history is found:
  - verify correct replacement module was installed
    - HVBOM may be used to verify correct part application
  - verify the configuration of replacement module was correct
    - re-configure module using as-built data if prior configuration is suspect
  - verify the module was not obtained from a like vehicle and installed into customer vehicle
    - return the swapped module to source vehicle and obtain new replacement module
Were any causes of a communication concern found in the vehicle service history?

Yes PROGRAM or INSTALL a new module as necessary.

No GO to N3

N3 PROGRAM THE TCM (TRANSMISSION CONTROL MODULE) WITH THE LATEST CALIBRATION

NOTE: If a GSM self-test is carried out, the driver door must be fully closed. A false P166B DTC may set if the driver door is not fully closed during the self-test.
- Using a diagnostic scan tool, program the TCM with the latest calibration. REFER to:MODULE PROGRAMMING
- Ignition OFF.
- Wait 10 seconds.
- Start the engine.
- Move the selector lever to each gear position. Let the vehicle move both forward and in reverse.
- Using a diagnostic scan tool, CARRY OUT the GSM self-test.
Is DTC U0301 present in the GSM?

Yes GO to N4

No The concern is not present at this time. It may have been caused by an incorrect or corrupted TCM calibration.

N4 CHECK FOR CORRECT TCM (TRANSMISSION CONTROL MODULE) OPERATION

Ignition OFF.

Disconnect TCM C1750A and all related in-line electrical connectors.

Using a good light source, inspect all disconnected electrical connectors for the following:
- corrosion - install new connector or terminal and clean the module pins
- damaged or bent pins - install new terminals or pins
- pushed-out pins - install new pins as necessary
- spread terminals - install new terminals as necessary

Reconnect TCM C1750A and all related in-line electrical 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 TSB. If a TSB exists for this concern, DISCONTINUE this test and FOLLOW TSB instructions. If no TSB addresses this concern, INSTALL a new TCM. REFER to: Transmission Control Module (TCM) .

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.