DTC 21

DTC 21: Cancel Latch Signal System

DTC SET CONDITIONS
The PCM communicates cancellation retention information between the two microprocessors. This DTC is set when cancellation retention information contains inconsistency.

TROUBLESHOOTING HINTS (The most likely causes for this code to be set are:)
Malfunction of the PCM.

DIAGNOSIS
Replace the PCM [Refer to Power Control Module (PCM)]. Then check that diagnostic trouble code 21 is not set.