P167A – Calibration Mismatch

P167A Possible Symptoms

Engine Light ON (or Service Engine Soon Warning Light)

P167A Possible Causes

Transmission Control Module (TCM) Relearn Procedure Not Performed

P167A Description

During the initial ignition on, the Transmission Control Module (TCM) receives the calibrated data from the EEPROM assembly inside the transmission and stores this information in the EEPROM of the TCM. At every ignition on, the TCM compares the stored data in the EEPROM to the transmitted data from the EEPROM in the transmission. If the calibration data does not match the DTC will set and the MIL will illuminate after one failure.