Question about 2001 Jeep Grand Cherokee

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2001 Jeep Grand Cherokee ECM question

I have had intermittent dying of engine at stops and idle revs along with occassional bucking at a shift point around 30 MPH. The fault code P0302 was read from the ODB. I replaced the sensor with a good brand and it was fine for a few days and then came back again. A mechanic i since tok it to says he thinks the ECM is bad but that I cannot replace it as it neds to be programmed to recognize the smart keys etcetera. Is this true or can i just replace it with another one myself?

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Hi there:
P0302 Code - Cylinder #2 Misfire Detected
A P0302 code means that the the car's computer has detected that one of the engine's cylinders is not firing properly. In this case it's cylinder #2.

Symptoms may include:
the engine may be harder to start
the engine may stumble / stumble, and/or hesitate
other symptoms may also be present

A code P0302 may mean that one or more of the following has happened:
Faulty spark plug or wire
Faulty coil (pack)
Faulty oxygen sensor(s)
Faulty fuel injector
Burned exhaust valve
Faulty catalytic converter(s)
Running out of fuel
Poor compression
Defective computer

Possible Solutions:
If there are no symptoms, the simplest thing to do is to reset the code and see if it comes back.

If there are symptoms such as the engine is stumbling or hesitating, check all wiring and connectors that lead to the cylinders (i.e. spark plugs). Depending on how long the ignition components have been in the car, it may be a good idea to replace them as part of your regular maintenance schedule. I would suggest spark plugs, spark plug wires, distributor cap, and rotor (if applicable). Otherwise, check the coils (a.k.a. coil packs). In some cases, the catalytic converter has gone bad. If you smell rotten eggs in the exhaust, your cat converter needs to be replaced. I've also heard in other cases the problems were faulty fuel injectors.

Try this before to replace ECM or other parts.

Hope this helps; also keep in mind that your feedback is important and I`ll appreciate your time and consideration if you leave some testimonial comment about this answer.

Thank you for using FixYa, have a nice day.

Posted on Feb 24, 2012

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