Clifford Auto Parts

Premium Engine and Electronic Control Module Supplier



Our team of ECM repair technicians has compiled a comprehensive list to assist you in identifying potential issues with your ECU PCM (Power Control Module). If you are encountering any of the following problems with your vehicle, please review this list:

  • Check Engine Light reappears shortly after being reset.
  • Vehicle has been jump-started with reverse polarity.
  • Engine suddenly shuts off without apparent cause.
  • Engine Computer has experienced water damage or burn damage.
  • Loss of spark.
  • Loss of injection pulse or power to the fuel pump.
  • Intermittent starting issues.
  • Engine Computer overheating problems.
  • Broken pins on the Engine Computer.
  • Lack of communication between the Engine Computer and the Scanner.
  • CMOS Checksum error (primarily observed in Ford ECMs).
  • Erratic engine idle.
  • Dirty or malfunctioning Mass Air Flow (MAF) sensor.
  • Stalling, where the vehicle shuts off abruptly.
  • Poor running condition.
  • Decreased fuel economy.

If any of these symptoms match what you are experiencing, there may be a fault with your PCM/ECM/ECU Control Module. It is recommended to seek professional assistance to diagnose and address the issue promptly.

Here's the schematics to recap the following Inputs and Outputs that need to be checked in order to recognize a faulty Engine Control module.‚Äč
Before sending us your unit for ECM repair, we recommend you test & replace the following:
  • Ignition Module & Coils
  • Ignition Control Module & Coils
  • DME Relay or Main Relay
  • Spark Plugs
  • Fuel Injectors
  • Idle Control Valves
  • TDC and RPM Reference Sensors
  • Air Flow or Mass Flow Meter
  • Throttle Position Sensor
  • Power Supply (Ford ECMs mostly)
  • Grounds
  • Check Engine Light DTC

If you have thoroughly reviewed these components and suspect a faulty engine computer, we recommend testing it with us first before investing in costly diagnostic labor and sensors. By choosing our testing services, you can save both time and money. Additionally, we have created a helpful video demonstrating how to diagnose faulty engine control modules (ECMs). Furthermore, we offer in-depth Ford PCM repairs specifically designed for flooded vehicles.


It is common for vehicle owners to attribute various issues to a faulty Auto Computer, particularly when purchasing a pre-owned vehicle. However, it is important to note that many other factors can contribute to these problems, and the Engine Computer (ECM) may not be the actual culprit. At our ford PCM repair center, we understand these concerns and are here to help.

We have compiled a comprehensive list of potential causes for a faulty powertrain control module, ensuring that you can accurately determine if your ECU (Electronic Control Unit) is indeed responsible for the issues you are experiencing. If you still have doubts about the condition of your car’s PCM or if you have any other questions regarding ECU PCM repair, please fill out the inquiry form below, and our team will be glad to assist you. It’s important to note that in most cases, flooded vehicles have little chance of having a functional PCM (powertrain control module PCM).

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