What Does The Engine Control Module Do?

What are the symptoms of a bad engine control module?

Symptoms of a Bad or Failing Engine Control Module (ECM)

  • Check Engine Light Turns On.
  • Engine Stalling or Misfiring.
  • Engine Performance Issues.
  • Car Not Starting.
  • Poor Fuel Economy.

What is the function of engine control module?

It essentially functions as the main computer for many of the vehicle’s engine performance and drivability functions. The ECM takes the information from the engine’s various sensors, and uses that information to calculate and tune engine spark and fuel for maximum power and efficiency.

How much does it cost to replace an engine control module?

The average cost for engine control module (ECM) replacement is between $928 and $1,006. Labor costs are estimated between $80 and $100 while parts are priced between $849 and $906. This range does not include taxes and fees, and does not factor in your unique location.

Can I drive with bad ECM?

If the ECM were to become damaged or faulty, then it could spell trouble for the entire engine because it would not be managed properly. If the engine is not managed properly, then it is not going to operate properly and then your car won’t work properly.

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How do I know if my ECM relay is bad?

Symptoms of a Bad or Failing ECM-Power Relay

  1. No 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.
  2. 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.
  3. Battery drain or dead battery.

What causes bad engine control module?

Corrosion and moisture



Corrosion or damage due to moisture is one of the main reasons for ECM failure. Corrosion can enter the ECM through the wiring harness and moisture can enter by a failure in the seals in the ECM itself. This happens over a period of time (5 to 10 years) due to the ECMs exposure to the elements.

Where is the engine control module located?

Location of the Engine Control Module



Generally, the ECM is located near your car’s engine. Usually, it is on the passenger’s side behind the glove box, under the floorboard, or under the seats. It can also be located behind the kick panels, under the hood, or beneath the dashboard.

Can ECM be repaired?

The first, and easiest, way to repair an ECM is if there’s a problem with the power supply. Oftentimes, these can be repaired by a skilled mechanic or electrician, by rectifying any shorts or bad connections. However, most ECM problems are a result of a bug in the software itself. This isn’t common.

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How do you reprogram an engine control module?

Ensure the OBD-II vehicle interface is properly connected. Switch the ignition to ON but do not yet start the engine. Choose Detect Vehicle… from the Tools menu, then select Program Engine ECU when the window appears, and click OK. Select Program ENgine ECU to enter programming mode.

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

7 Common PCM Failure Symptoms

  1. YourCheck Engine’ Light is On.
  2. Your Car Won’t Start or Starts Roughly.
  3. Sudden Loss of Gas Mileage.
  4. You Failed Your Emissions Test.
  5. Your Engine Stutters or Stalls.
  6. Erratic or Random Shifting.
  7. You’re Receiving a PCM-Related Error Code.
  8. What to Do If You Experience PCM Failure Symptoms.

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 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.

Does a used ECM need to be reprogrammed?

Constant vibration loosens engine parts just enough to affect performance. Your parts may not be bad enough to warrant replacement, but the ECM should be reprogrammed to compensate for their older, more road-worn condition. With optimal ECM programming, your engine will run much more efficiently.

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