Quick Answer: What Can Cause A PCM To Go Bad?

Where is the PCM fuse located?

The fuse box is located on the passenger side next to the battery..

How do I know if I need to replace my PCM?

What Are the Symptoms of a Faulty PCM?Your “check engine” light is on.Other warning lights may be on, including traction control and ABS.You lose fuel economy for no apparent reason.Your car stutters when starting, requires multiple attempts, or won’t start at all.Stuttering or stalling during idling.More items…•

How long does it take to replace PCM?

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.

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.

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.

Does the PCM control the fuel pump?

The ignition or powertrain control module (PCM) usually controls the fuel pump relay. When switched on the fuel pump relay will provide current to the fuel pump so that it may function. So, any faults with it can cause fuel pump issues.

Will a bad PCM drain battery?

Battery drain or dead battery A failed ECM power relay can also cause a battery drain or dead battery. If the relay shorts it can leave power on to the computer, even when the vehicle is turned off. This will place a parasitic drain on the battery, which will eventually cause it to go dead.

Can I drive with a bad PCM?

A failed PCM or TCM can cause the car to get stuck in gear, which can be a serious safety issue. It can also lead to costly transmission damage.

Can you fix a PCM?

PCMs are not rebuilt in the same way that alternators and water pumps because there are no mechanical parts that wear out. Remanufacturing in this case usually means testing the computer, isolating and repairing any faults that may be found, then retesting the computer to make sure everything works correctly.

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.

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.

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.

Does a used PCM need to be reprogrammed?

Yes, the pcm will have to be re flashed for the car to run. Security settings as well as the VIN and millage will be reprogrammed as well.

How do you diagnose a bad ECM?

Engine Stalling or Misfiring Erratic engine behavior is another common symptom of a bad or failing ECM. A faulty computer can also be responsible for engine stalling or misfiring, though this tends to be more intermittent. These symptoms may come and go, and may appear to have no pattern to their severity or frequency.

How much does a PCM repair cost?

The average cost for powertrain control module replacement is between $886 and $963. Labor costs are estimated between $79 and $100 while parts are priced between $807 and $863. This range does not include taxes and fees, and does not factor in your unique location. Related repairs may also be needed.

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.

Can I flash my own PCM?

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