A power-train control module stands for PCM, is a component of automotive Technology, an onboard computer which is used on vehicles. It is a combination of the engine control unit (ECU) and the transmission control unit (TCU). It is also called the brain of the engine control system. On some cars, there are multiple computers: the Transmission Control Unit, the Body Control Module and the PCM, in whole three computers. These automotive computers are mostly very consistent, dependable and reliable. The PCM controls more than a hundred things in a car/truck.
There are so many of error codes which can occur, and these indicate that some of the subsection of car experiencing a problem. Some of the error codes are as follows:
- P0602 Control Module Programming Error
- P0604 Internal Control Module Random Access Memory (RAM) Error
- P0606 ECM/PCM Processor
- P0608 Control Module VSS Output ‘A’
- P0610 Control Module Vehicle Options Error
How the Error codes occur?
As we mentioned above the power-train control module is also known as brain of the engine control system “so the brain is not performing correctly then engine and anything else (which a microprocessor controls) not perform as well, which may include the transmission, charging system, communications with other onboard control modules and various emission controls”. So the non-functionality of the brain causes the above-mentioned errors codes to occur. If you see any of these codes when diagnosing the vehicle with a code reader or scan tool, it may mean the PCM has failed, Additional diagnostic tests will usually be necessary to confirm the problem is really the power-train control module and after this kind a detail diagnosis, then and only then the PCM be replaced.
Indication of Error codes
When one of the above mentioned errors codes Occurs, generally it will turn on the light on the dashboard naming “check engine”. The primary inputs come from many sensors to the PCM, of many types, which are spread across the car. Many of them are sloping toward engine performance and engine management. These sensors fail at a much higher rate than any of the computers do.
Why PCM usually Fail?
PCMs usually fail for the following reasons: voltage overloads (often due to an actuator circuit or short in a solenoid) or environmental factors (corrosion, vibration or thermal stress). If an actuator circuit or short in a solenoid is not found and repaired, the voltage overload it creates may cause damage the PCM.As for environmental factors, water is the major thing to avoid. If water gets inside a PCM, it can create short circuits and set up irreversible corrosion that ruins electronic connections all over inside the PCM. Most manufacturers will not even attempt to repair a PCM if the vehicle it came out of was submerged in flood or the damage is caused due to water by any means. Vibration and Thermal stress can create micro-cracks in circuit boards (which are repairable). This often has more due to with the roughness of the circuit design than its operational factors in the motor vehicle.
Replacement or Repair Advice
Most of the vehicles have upgradeable software in their PCMs, so always be sure to check for any Technical Service Bulletins (TSBs) that be valid to possible problems. Whenever the replacement is required, always use a new factory PCM and install the latest software. This should have to be done from an authorized service centre for your brand of vehicle. Sometimes a PCM can be mistakenly replaced when there was a faulty engine sensor that was unnoticed in the initial diagnosis. To prevent this, professional technicians will pursue a flow chart when diagnosing an error code. The terms PCM (power-train control module) and ECM (engine control module) are usually used interchangeably. Theoretically, the ECM controls engine-related functions only, while the PCM controls transmission and engine operation. The PCM and other electronic components should not be detached while the battery is connected, if the PCM is functioning properly, this could cause it to fail. Using jumper cables to recharge the battery can be extremely dangerous to the PCM, and other electronic controllers on the motor vehicle.