P167A

P167A-CALIBRATION MISMATCH

For a complete wiring diagram Refer to the Wiring Information.

Theory of Operation

The Transmission Control Module (TCM) performs various internal tests to verify proper controller operation. If the TCM detects that the variables that dictate the vehicle application are not present, the controller will enter Limp-in mode and illuminate the MIL.

- When Monitored:
Continuously with the ignition on.

- Set Condition:
If the TCM detects the variables that dictate the vehicle application are not present.





Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. 8HP45 Pre-Diagnostic Troubleshooting Procedure

PERFORM TCM REPLACEMENT PROCEDURE

NOTE: Controller is programmed with generic boot and trim calibrations and will not allow the correct vehicle Powertrain management.

1. With the scan tool, attempt to program the TCM with the latest calibrations.

Were you able to program the TCM successfully?

Yes

- Test Complete.
- Perform the TRANSMISSION VERIFICATION TEST. Verification Tests

No

- Using the schematics as a guide, check the Transmission Control Module Assembly (TCMA) terminals for corrosion, damage or terminal push out. Pay particular attention to all power and ground circuits. If no problems are found, replace and program the TCMA. Valve Body - Removal.
- Perform the TRANSMISSION VERIFICATION TEST. Verification Tests