DTC Advanced Diagnostics: U0302 (A/T System)

DTC U0302 : Software Incompatibility With Transmission Control Module

General Description

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

The transmission control module (TCM) and the powertrain control module (PCM) uses communication line (F-CAN lines) to transmit/receive multiple signals simultaneously. When the software version in the TCM and software version sent from the PCM via the F-CAN lines are mismatched 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
Vehicle	ON mode

Malfunction Threshold

The software version in the TCM and software version sent from the PCM via the F-CAN lines 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.

Software version in the TCM and the PCM are mismatched

Confirmation Procedure

Operating Condition

Turn the vehicle to the ON mode, and wait for several seconds.

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.