DTC P0600: Powertrain Control Module (PCM) Serial Communication Failure (V6) (2017-19)

General Description 

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

The driver IC which has diagnostic function and the CPU are built into the powertrain control module (PCM). If the CPU cannot receive diagnostic information from the driver IC for a specified duration due to occurrence of communication abnormality between the driver IC and the CPU, the PCM detects a malfunction and stores a DTC.

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

Execution	Continuous
Sequence	None
Duration	5 seconds or more
DTC Type	One drive cycle, MIL on
OBD Status	PASSED/FAILED/NOT COMPLETED (STILL TESTING)

Enable Conditions 

Condition	Minimum	Maximum
12 volt battery voltage [BATTERY]	10 V	-
State of the engine	Running

[ ]: HDS Parameter

Malfunction Threshold 

One of the conditions is met for at least 5 seconds:

• The CPU does not receive signal from the driver IC via the communication lines.
• The signal sent from the driver IC is abnormal.

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

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.