F-CAN Malfunction (Powertrain Control Module (PCM)-Servo Unit)

DTC U0129: F-CAN Malfunction (Powertrain Control Module (PCM)-Servo Unit)




General Description
The controller area network (CAN) transmits/receives pulsing signals to/from the control modules simultaneously by using two signal lines (CANH and CANL).

When the information is not sent from the servo unit through the F-CAN and this condition continues for a specified time or when the information sent from the servo unit is abnormal and this condition continues for a specified cycle, the powertrain control module (PCM) detects a malfunction and a DTC is stored.




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




Enable Conditions

Malfunction Threshold
One of these conditions must be met.
- The PCM does not receive any signals from the servo unit for at least 1 second.
- The information sent from the servo unit is abnormal at least 20 times.

Diagnosis Details

Conditions for illuminating the indicator
When a malfunction is detected, the DTC and the freeze frame data are stored in the 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.