DTC U0302 (CVT)

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DTC U0302: PGM-FI System and A/T System Program Version Mismatch

General Description

Courtesy of HONDA, U.S.A., INC.

The transmission control module (TCM) and the powertrain control module (PCM) uses communication line (H line and L line) to transmit/receive multiple signals simultaneously. When the software version in the TCM and software version sent from the PCM via the TM-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 TM-CAN lines are mismatched (software version of the TCM is old compared to the PCM) 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.

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.