DTC P16C0: PCM A/T Control System Incomplete Update (USA and Canada models) (2013-18)

General Description

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

The control program in the powertrain control module (PCM) has a rewriting function that can be done in the field. The programs in the PCM CPU are the powertrain control program (rewritable program) and the update program (non-rewritable program). When the program rewriting process is not finished normally, such as turning off the PCM power during the rewriting process, and then pressing the engine start/stop button to select the ON mode again, the A/T CPU starts according to the rewriting function program, and this DTC is sent to the FI CPU via serial communication and stored in the PCM.

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

Execution	Continuous
Sequence	None
Duration	1 second or less
DTC Type	One drive cycle, MIL on, A/T gear position indicator off
OBD Status	N/A

Enable Conditions

Condition
Engine start/stop button	ON mode

Malfunction Threshold

The program rewriting process does not finish normally due to an irregular process, such as turning off the PCM power during the A/T CPU rewriting process, and the engine start/stop button is pressed to select the ON mode again.

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 internal circuit failure
A/T CPU program unwritten

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.