Advanced Diagnostics

DTC U0122: F-CAN Malfunction (VSA-Engine Control Module (ECM)/ Powertrain Control Module (PCM))




General Description
Using two serial signal lines (CANH and CANL), the frame controller area network (F-CAN) enables the engine control module (ECM)/powertrain control module (PCM) and the vehicle stability assist (VSA) modulator-control unit to communicate with each other. If the ECM/PCM receives no signal from the VSA modulator-control unit for a specified time, it detects a malfunction and stores a DTC.




Monitor Execution, Sequence, Duration, DTC Type, OBD Status




Enable Conditions

Malfunction Threshold
No signal from the VSA modulator-control unit is received for at least 1 second.

Diagnosis Details

Conditions for illuminating the indicator
When a malfunction is detected, the DTC and the freeze frame data are stored in the ECM/PCM memory. The MIL does not come on.

Conditions for clearing the DTC
The DTC and the freeze frame data can be cleared by using the scan tool Clear command or by disconnecting the battery.