<P> A power - train control module , abbreviated PCM , is an automotive component , a control unit , used on motor vehicles . It is generally a combined control unit , consisting of the engine control unit ( ECU ) and the transmission control unit ( TCU ) . On some cars , such as many Chryslers , there are multiple computers : the PCM , the Transmission Control Unit , and the Body Control Module , for a total of three separate computers as an example . These automotive computers are generally very reliable . The PCM commonly controls more than 100 factors in a car or truck . There are many hundreds of error codes that can occur , which indicates that some subsection of the car is experiencing a problem . When one of these errors occurs , usually it will turn on the `` check engine '' light on the dashboard . The PCM is one of potentially several on - board computers , or essentially the `` brain '' of the engine control system . </P>
<P> A power - train control module , abbreviated PCM , is an automotive component , a control unit , used on motor vehicles . It is generally a combined control unit , consisting of the engine control unit ( ECU ) and the transmission control unit ( TCU ) . On some cars , such as many Chryslers , there are multiple computers : the PCM , the Transmission Control Unit , and the Body Control Module , for a total of three separate computers as an example . These automotive computers are generally very reliable . The PCM commonly controls more than 100 factors in a car or truck . There are many hundreds of error codes that can occur , which indicates that some subsection of the car is experiencing a problem . When one of these errors occurs , usually it will turn on the `` check engine '' light on the dashboard . The PCM is one of potentially several on - board computers , or essentially the `` brain '' of the engine control system . </P>
what does pcm stand for on a vehicle
what does pcm stand for on a vehicle
power - train control module
power - train control module