DTC U0300: PGM-FI System and A/T System Program Version Mismatch (2013-15)

General Description

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

A check of the communication data is done during communication between the FI CPU and the A/T CPU. When the FI CPU or the A/T CPU is rewritten in the powertrain control module (PCM), and the internal communication version that is rewritten does not match, the PCM detects a malfunction and stores a DTC.

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

Execution	Continuous
Sequence	None
Duration	500 milliseconds or more
DTC Type	One drive cycle, MIL on
OBD Status	PASSED/FAILED/NOT COMPLETED (STILL TESTING)

Enable Conditions

Condition
Engine start/stop button	ON mode

Malfunction Threshold

The FI CPU or the A/T CPU is rewritten in the PCM, but the internal communication version that is rewritten does not match.

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.

FI CPU and A/T CPU internal communication data version mismatch

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 battery.