Can You Use A Junkyard PCM?

How do you troubleshoot a PCM?

How to Troubleshoot the PCMLocate your vehicle’s PCM.

Look specifically at the wiring harness.

Locate your vehicle’s diagnostic data port.

Connect your OBD-II scanner to the diagnostic data port.Push your key into the vehicle’s ignition cylinder.

Watch the OBD-II device’s read-out screen for the codes.More items….

How do you reset the PCM?

How Can I Reset the PCM on My Car?Open the hood of the vehicle.Disconnect the negative battery cable from the battery. Use a wrench to loosen the lock nut, and pull the cable off. This cuts the power to the PCM. Wait for five minutes. Reconnect the negative battery cable to the battery and close the hood of the vehicle. The PCM is now reset.

Does a new PCM need to be programmed?

Reprogramming may be required for a variety of reasons. … PCM Reprogramming is also necessary to change the engine idle speed, spark timing, fuel mixture or other emission control functions. PCM Reprogramming may be required to resolve a hot or cold starting issue, idle roughness, stalling, or an emissions failure.

Is ECM and PCM the same thing?

PCM (Powertrain Control Module) – This is a combined engine and transmission control unit which will provide management and correct function of the engine and transmission from one control unit. ECU (Engine Control Unit) / ECM (Engine Control Module) – This is an electronic control unit that manages the engine only.

How do I know if my ECM relay is bad?

Symptoms of a Bad or Failing ECM-Power RelayNo power when the key is inserted. One of the first symptoms of a problem with the ECM power relay is no power when the key is inserted. … Engine will not start. Another common symptom of a problem with the ECM power relay is an engine that will not start or turn over. … Battery drain or dead battery.

What are the symptoms of a bad PCM?

Usually a bad or failing ECU will produce a few key symptoms that can alert the driver of a potential issue.Check Engine Light comes on. An illuminated Check Engine Light is one possible symptom of a problem with the ECU. … Engine stalling or misfiring. … Engine performance issues. … Car not starting.

What all does the PCM control?

What Does The Powertrain Control Module Do? The PCM is a powerful computer that is in charge of managing or monitoring the engine’s ignition system. It also has to monitor the fuel injection, emission systems, positioning of the rotating assembly, transmission, and exhaust system.

Can a bad PCM cause the AC not to work?

The PCM sends a trigger signal to engage the AC compressor. If that signal is not received then the AC will not work. It could be a bad PCM. … The PCM could work fine for all other functions but still fail when it comes to signalling the AC compressor.

Can a bad PCM cause transmission problems?

For example, poor performance or unexplained drops in fuel economy or efficiency are often related to onboard car computer problems, or faulty ECU issues. A damaged ECU can cause problems when shifting gears in an automatic transmission, or cause sudden jerking or stopping that’s similar to transmission problems.

Will a bad PCM throw a code?

The PCM should give you a code for P0600 through P0606 indicating that the computer has a processor error. However, if the PCM is corrupt, then just like a desktop computer, there is no accessing anything and no codes are put out for the computer would have no way of sending a signal.

Does the PCM control the alternator?

The PCM sends a 5-volt, variable duty cycle signal to the terminal to control the alternator voltage set point.

Does the PCM control the fuel pump?

When the key is turned on, the powertrain control module (PCM) closes the fuel pump relay, which activates the fuel pump for about three seconds to pressurize the fuel injectors. … When the engine starts, the CKP signals the PCM to keep the fuel pump and fuel delivery system running.

How much does it cost to have a PCM reflash?

Prices could range from $80 to $150, depending on the service location you choose. The process takes around about half an hour, but keep in mind that most auto-electricians charge you for at least one hour of work. PCM reprogramming is also one of the few times we’ll recommend a dealership over an independent mechanic.

How much does it cost to reprogram a PCM?

How much it will cost you for the total pcm replacement cost when you deal with a used powertrain control module and reprogramming depends on where you are going for the updates. Since there are no parts involved, the labor costs will not be too high, so the prices will range between an average of $80 and $150.

What causes PCM failure?

PCMs typically fail for one of two reasons: voltage overloads (often due to a short in a solenoid or actuator circuit) or environmental factors (corrosion, thermal stress or vibration). … If water gets inside a PCM, it can short circuits and set up irreversible corrosion that ruins electronic connections.

Can you reflash a used PCM?

PCMs are built with microchips that can be reprogrammed electronically without being removed from the vehicle.