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….
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.
How do I reprogram my PCM at home?
To reprogram a PCM or other vehicle module, you need a factory scan tool, or an aftermarket scan tool with reprogramming capabilities, or a J-2534 compliant “PassThru” interface tool (or J-2534-1 for 2004 & newer vehicles) that can connect a PC or scan tool to the vehicle’s diagnostic connector or module.
How long does it take for a PCM to relearn?
30 secondsIt only takes ~30 seconds for the computer to relearn its settings. Generally it’ll idle high during that time (at least on WJ’s) until it learn them.
How much does it cost to fix a PCM?
The PCM controls more than 100 factors in your car, and for that reason, is very important – and expensive. A typical pcm replacement cost comes to between $500 and $1,500 on average.
How do you know if your PCM is bad?
7 Common PCM Failure SymptomsYour ‘Check Engine’ Light is On. … Your Car Won’t Start or Starts Roughly. … Sudden Loss of Gas Mileage. … You Failed Your Emissions Test. … Your Engine Stutters or Stalls. … Erratic or Random Shifting. … You’re Receiving a PCM-Related Error Code. … What to Do If You Experience PCM Failure Symptoms.
Can you test a PCM?
You need to check the sensors that are connected to your PCM, as well as the wires that connect them. If you’re seeing a PCM code – or two, or three – it can really help you narrow in on which sensors or wires are faulty. Perform a visual inspection of these wires, as well as checking them with a multimeter.
Is the 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.
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.