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Old 11-24-2009, 09:37 AM   #1
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CPU Failure

My cars been having this problem for a couple years now. Every year about the same time my 2001 V6 mustang decides to die if I don't drive it for more than 2 days in a row. Initially I thought the battery was just old so I replaced it. Lasted me about 8 months then the car died again. Replaced it again and another 8 months later its giving me problems again so I can assume its not bad batteries. I took it to a shop where the guy first checked all electrical equipment but no problem found. Got an expert to check it out... He said the CPU in the engine was causing a huge energy drain and that it needed to be replaced but only a Ford dealership could do it because it needed to be programmed. I immediately knew this was going to financially destroy me. He said costs would be well over a thousand. Thats just for the replacement part.
I was wondering if I could get someone elses opinion or see if anyone else had this problem before.
They told me I was better off getting a newer car since mines over 100k miles anyways but I just can't afford that right now. Any suggestions?
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Old 11-24-2009, 11:50 AM   #2
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Re: CPU Failure

Sounds kind of odd that the ecu would keep killing the battery like that. Of course, I'm no expert. Have you checked your alt. and voltage regulator? I know if the voltage regulator is reading high, it'll eventually kill the batt and burn the alt.
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Old 11-24-2009, 01:12 PM   #3
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Re: CPU Failure

If you can check to make sure it's not any other electrical components yourself do that first. I don't trust mechanics on troubleshooting no matter how good the shop is.

It might be possible to pick up an ECU from a junkyard, I don't think they are VIN specific.
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Old 11-24-2009, 01:42 PM   #4
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Re: CPU Failure

My cpu ones went out on my 97 and I got it check with a professional all you need to do is take it off the car and take it to some one that knows how to check them and they will tell u if u need another or not. Another thing I think autozone checks if ur alternator is bad you might want to check it out with them.
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Old 11-24-2009, 02:09 PM   #5
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Re: CPU Failure

I'm not sure about everywhere else.....but the autozone guys around here are a bunch of ****in idiots.....I mean the real "walmart reject" types....and I wouldn't even let walmart work on my bicycle if that tells ya anything! But it's true, ALL of the major parts houses should be able to check your alt....autozone, advanced, o'reilly's, pep-boys, etc.
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Old 11-24-2009, 03:52 PM   #6
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Re: CPU Failure

You should be able to get a used CPU and install it yourself pretty easily.
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Old 11-25-2009, 05:14 PM   #7
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Re: CPU Failure

The PCM should be located in the passenger kick panel and is probably secured with a few bolts and an electrical harness. Should not be that tough to remove and replace.
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Old 11-28-2009, 01:44 AM   #8
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Re: CPU Failure

i have an extra cpu... send me a private message ifyour interested. cheap mine turned out fine and i couldnt return the one i bought. PM and we can work out price
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