P1381

DTC P1381 ABS Rough Road Class 2 Serial Link Error

Circuit Description
The powertrain control module (PCM) monitors no ABS signal. When PCM does not receive ABS signal, PCM will set DTC P1381.

Conditions for Setting the DTC
- PCM does not receive ABS signals from ABS ECU.
- Vehicle speed is more than 0 mph.
- Load is less than 99%.
- Engine revolution is less than 6250rpm.
- 2.5 second after key on.
- Misfire DTCs exist.
- 100 test failures within 120 test samples.

Action Taken When the DTC Sets
- The PCM will store DTC 1381 only, MIL on.

Conditions for Clearing the MIL/DTC
- A history code DTC P1381 will clear after 40 consecutive warm-up cycles have occurred without a fault.
- DTC P1381 can be cleared by Tech-II or by disconnecting the PCM battery feed.

Diagnostic Aids
Check for the following conditions:
- Inspect open circuit of communication wire between ABS ECU and PCM.
- Follow ABS ECU diagnosis procedure.

Reviewing the Failure Records vehicle mileage since the diagnostic test last failed may help determine how often the condition that caused the DTC to be set occurs. This may assist in diagnosing the condition.