P1381 GEO – Misfire Detected – No Communication with Brake Control Module

P1381 GEO Possible Symptoms

Engine Light ON (or Service Engine Soon Warning Light)

P1381 GEO Possible Causes

P1381 GEO Possible Causes

P1381 GEO Description

The Powertrain Control Module (PCM) receives rough road information from the Electronic Brake Control Module (EBCM) on the serial data circuit. The 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.