Quick Answer: What Does The PCM Control?

Can you 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..

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.

What causes a PCM to fail?

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.

What does the PCM fuse do?

The power distribution center is located under the hood and contains almost every single one of the vehicle’s fuses and relays. The ECM power relay, or the PCM relay, acts as a switch that provides power to the ECM. when the ignition key is turned off, the switches within the PCM relay no longer receive battery.

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.

Is a PCM and ECM 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.

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.

Can I flash my own PCM?

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

How much does it cost to fix a PCM?

The Best in Auto Repair 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.

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…

Does a PCM have to be flashed?

Reflashing must be done in the car. If you own flashing equipment, it’s no problem. If you don’t, you must install the PCM and then put the car on the tow truck and haul it to a GM dealer for programming.

Can the 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.

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.

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.

Can I use a junkyard PCM?

It wouldn’t run for more than two seconds. I took it all to the dealer and paid $84, and haven’t had a problem for 2,000 miles now. Shifts fine, fuel pump primes, engine light is off, it’s all good. The short answer in my experience is: no, you can not plug a junkyard PCM in without flashing it to your VIN.

Does a PCM need to be reprogrammed?

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.