DTC P1381: Misfire Detected - No Communication With Brake Control Module: Description

The PCM receives rough road information from the Electronic Brake Control Module (EBCM) on the serial data circuit. PCM uses the rough road information to enhance the misfire diagnostic by distinguishing crankshaft speed variations caused by driving on rough road surfaces from variations caused by true misfires. The EBCM transmits rough road information based on inputs from the wheel speed sensors. If a loss of communication occurs which causes PCM not to receive rough road information while DTC P0300 is requesting MIL, DTC P1381 will set.