Question about 2000 Jeep Grand Cherokee

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Jeep Grand Cherokee 2000; 115,000 miles; check engine light came on. I searched internet and found that turning key on 3 times gives problem codes; codes p0201-p0208 indicating injectors; took to dealer who put on his computer and found nothing but said could be intermittent PCM problem and offered to replace at $900. He reset so no code would show on the odometer. I declined the service, then I located rebuilt for $250, gave them my VIN# and installed myself. After a week, Jeep again surged occassionally and showed the same codes again; p0201-p0208. However check engine light is not on. I am trying to avoid the $90/hr dealer service again to tell me the same thing. Is there anything I can do, or just wait until it breaks down to find the problem.

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  • hunterwi Jul 20, 2009

    I presume the PCM is the same as ECM. If so, the PCM has already been replaced as I said in my initial comments. I can check the alternator at a shop, but is this the only other fix?
    Chris J



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Power Module Control gets feedback from the coolant sensor and the Throttle position sensor. These are related to all feedback to calculate the golden ratio Air:gas mixture 14.6 to make engine run efficiently. Do you have good idle and smooth accelerations. If not then I believed your throttle valve needs a good cleaning. Coolant sensor need to check if its resistance is in spec. If these provide erratics outputs then the PCM will be crazy to contribute to the problem. This time your engine light is not on since the erratic feedback is not overriding the Oxygen sensor to activate the indicator. Good luck.

Posted on Jul 20, 2009

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Please post the VIN number on reply. I need to see the year code on your VIN. 2000 is OBD-II. Please double check the year on your title.



Check the alternator for bad diode(s),it has three of them inside. Any one go bad,it can cause voltage/phase/regulator problem.

Got to a better auto part store and ask them to check you alternator and battery ////charging system

They can test the alternator by just connecting the connecting the tester to the battery tesminals.

Some older shop has a test bench and you have to remove the alternator for test.

Call around and see who has the protable tester.

From difficulty scale of 1 to 10. This is part is a 6.

In order to trouble shoot this problem,problem must able to able to ran few wires from the ECU computer to the frame ground and negative terminal.

This will eliminate any chance of bad or insufficient ground to the ECU.

Wires does go bad,these wires is just to rule out bad ground to the computer. You can remove them after you pin point the problem.

Inspect and tighten any electrical connections under the hood.

Clean all electrical connectors.

These are the part one of the fix. Drive the car and see is there any more codes.


If the code is still coming up and loose it later then pull the ECU out and look for leaky capacities.

This has difficulty scale of 10!!!!!!

DO NOT try it unless you can solder and handle electronic in a comfortable manner.

Most people do an ECU swap. Please mark sure the EEPROM chips set are match up before you get it out of the auto part store.


To sum it up

Do the alernator test.

Connect few 14 AWU wire from the ECU casing to negative battery terminal and ECU casing to metal frame ground.

Used for Jeep for few days and see is there any codes.

IF the codes still pops up then ECU will require attention.

As a preventive measure,do a fuel filter change and add Lucas or Sea foam additive to clean out the fuel system.

Please email me if you have any question.

Good luck.

Posted on Jul 20, 2009


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