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The powertrain control module, otherwise known as the PCM or computer, is essentially your vehicle's brain. The PCM in your car or truck is designed to control and regulate all of its functions and parts. Problems in the computer can lead to serious problems with almost every aspect of your car or truck because ...


The ECM power relay is the relay responsible for sending power to the ECM. If the relay fails, or has any issues, it can cause the vehicle to have all sorts of problems, and may even render it undriveable. Usually a problem with the ECM power relay will produce a few symptoms that can alert the driver of a problem that should be serviced. 1.


The engine control module (ECM), also commonly referred to as the engine control unit (ECU) or powertrain control module (PCM), is one of the most important components found on virtually all modern vehicles. It essentially functions as the main computer for many of the vehicle’s engine performance and drivability functions.


Symptoms of Wear or Failure of the PCM (Powertrain Control Module) Check Engine Light illuminates with codes that cannot be repaired are stored. When the PCM detects an issue, but no issue exists, the PCM may have failed, and is reading erroneously.


What are the symptoms of a bad powertrain control module - Answered by a verified Chevy Mechanic We use cookies to give you the best possible experience on our website. By continuing to use this site you consent to the use of cookies on your device as described in our cookie policy unless you have disabled them.


Powertrain Control Module (PCM) OPERATION. The Powertrain Control Module (PCM) performs many functions on your car. The module accepts information from various engine sensors and computes the required fuel flow rate necessary to maintain the correct amount of air/fuel ratio throughout the entire engine operational range.


What Are the Symptoms of a Bad PCM? A bad PCM, or power train control module, has a check engine light that does not turn off, an assortment of random codes, intermediate stalling issues and poor engine performance. The power train control module monitors the drive train system.


Powertrain Control Module (PCM ) Power Relay Note: The IGN START/RUN and ground circuits, or the B+ and VPWR circuits may be reversed in the harness connector. Refer to the Wiring Diagrams Manual Electronic Engine Control Cell for schematic and connector information. This pinpoint test is intended to diagnose the following:


Common Symptoms of a Failing… As the primary computer control for your vehicle, your powertrain control module (PCM) plays a vital role in ensuring that your engine and transmission work in tandem. When your PCM fails, it typically exhibits one or more different behaviors.


The core function of a fuel pump relay is to produce a small amount of voltage in a consistent manner which is supplied to the fuel pump once the ignition is turned on. Mostly the fuel pump relay is controlled and regulated by the powertrain control module or the ignition control module installed in your vehicle.