DTC Advanced Diagnostics: U0302
DTC U0302 : PGM-FI System and A/T System Program Version Mismatch
General Description
The transmission control module (TCM) and the powertrain control module (PCM) uses communication line (PT-CAN_H and PT-CAN_L) to transmit/receive multiple signals simultaneously. When the software version in the TCM and software version sent from the PCM via the PT-CAN lines are mismatched (software version of the TCM is old compared to the PCM) for a set time, the TCM detects a malfunction and stores a DTC.
Monitor Execution, Sequence, Duration, DTC Type
| Execution | Continuous |
| Sequence | None |
| Duration | 1 second or more |
| DTC Type | One drive cycle, MIL on, Shift position indicator blinks |
Enable Conditions
| Condition | |
|---|---|
| Other | When the vehicle is turned to the ON or OFF (LOCK) mode |
Malfunction Threshold
The software version in the TCM and software version sent from the PCM via the PT-CAN lines are mismatched (software version of the TCM is old compared to the PCM) for at least 1 second.
Possible Cause
The causes shown may not be a complete list of all potential problems, and it is possible that there may be other causes.
- Software version of the TCM is old compared to the PCM
Diagnosis Details
Conditions for setting the DTC
When a malfunction is detected, the MIL comes on, the shift position indicator blinks, and a Pending DTC, a Confirmed DTC, and the freeze data are stored in the TCM memory.
Conditions for clearing the DTC
The shift position indicator comes off by turning the vehicle to the OFF (LOCK) mode. The MIL is cleared if the malfunction does not return in three consecutive trips in which the diagnostic runs. The MIL, the Pending DTC, the Confirmed DTC, and the freeze data can be cleared with the scan tool clear command.