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

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