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2001 Mercury Mountaineer Question: PCM failure



Saffire, 5.0L V8, Forest Hill, WV, February 18, 2010, 21:43

What would cause the PCM to fail? It has been replaced 5 times.

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  • Answer #1

    patrick mannion from Greg Solow's Engine Room, February 19, 2010, 01:47

    A PCM should not fail repeatedly unless something is shorting it out. Is it the same circuit that blows each time say the fuel injectors or ignition coil supply? I have had a customer burn out an ECM on the same car twice, it is a car they don't use much and they jump started it backward twice in three years.
    There are good and bad ECM re-builders out there as well if it is a remanufactured computer you have been using.

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