DTC Advanced Diagnostics: U0301
DTC U0301:PGM-FI System and Transmission System Program Version Mismatch

General Description

The controller area network (CAN) uses two signal lines. TM-CAN_H and TM-CAN_L, and it receives and transmits multiple signals simultaneously to/from multiple control modules. When the software version in the powertrain control module (PCM) and the transmission control module (TCM) are mismatched for a set time, the PCM 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

Enable Conditions
Condition
 
Vehicle
ON mode

Malfunction Threshold
The software version in the PCM and the TCM are mismatched for at least 1 second.

Possible Cause
NOTE: The causes shown may not be a complete list of all potential problems, and it is possible that there may be other causes.
PCM software data not updated

Diagnosis Details
Conditions for setting the DTC
When a malfunction is detected, the MIL comes on and a Pending DTC, a Confirmed DTC, and the freeze data are stored in the PCM memory.

Conditions for clearing the DTC
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 or by disconnecting the 12 volt battery.