No Response From TCM (Transmission Control Module) - NGC

NO RESPONSE FROM TCM (TRANSMISSION CONTROL MODULE) - NGC












1. TEST FOR INTERMITTENT CONDITION

NOTE: Check for any TSB(s) related to the condition. If a TSB applies, perform the procedure outlined in the TSB before continuing.

1. Turn the ignition on.

NOTE: Make sure the IOD fuse is installed and battery voltage is between 10.0 and 16.0 volts.

2. With the scan tool, select ECU View.

NOTE: A red "X" will be next to the module that is not communicating, indicating that the module is not active on the Bus network. A green check indicates that the module is active on the Bus network.

NOTE: Check the TIPM for any active CAN C hardware DTCs, perform DTC before proceeding.

Does the scan tool display a red "X" next to the module?

Yes

- Go To 2

No

- The no response condition is not present at this time. Using the wiring diagrams as a guide, check all related splices and connectors for signs of water intrusion, corrosion, pushed out or bent terminals, and correct pin tension.

2. CHECK FOR LOSS OF COMMUNICATION WITH PCM
1. With the scan tool, read the active DTCs.

Does the scan tool display U0100-LOST COMMUNICATION WITH ECM/PCM?

Yes

- Perform the NO RESPONSE FROM PCM diagnostic procedure.

No

- Go To 3

3. (Z908) GROUND CIRCUITS OPEN




1. Turn the ignition off.
2. Disconnect the PCM C4 harness connector.

CAUTION: Do not probe the PCM harness connectors. Probing the PCM harness connectors will damage the PCM terminals resulting in poor terminal to pin connection. Install PCM Pinout Box 8815 to perform diagnosis.

3. Using a 12-volt test light connected to 12-volts, check each (Z908) Ground circuit.

Does the test light illuminate brightly for each circuit?

Yes

- Replace the PCM.
- Perform the appropriate TRANSMISSION VERIFICATION TEST. PCM/TCM Programming.

No

- Repair the open in the (Z908) Ground circuit.
- Perform the appropriate TRANSMISSION VERIFICATION TEST. PCM/TCM Programming.