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Old 10-29-2017, 01:49 AM   #1
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PCM issue

I have a 2010 V6 mustang with 70,000 miles. For several months now I have been going through an exchange with the Ford dealership with a PCM issue. I was receiving error codes for emission problems but Ford stated it was my original PCM going bad. The dealership ordered another PCM which took a month to get from there vendor. That PCM supposedly went bad within two weeks which I was getting the same error codes and check engine light. Ford ordered another PCM from there vendor and that too went bad within a week. I have gone through a total of three PCMs from there vendor which the dealership's response was that apparently they had a bad batch of PCMs. I am now waiting for another PCM to come in and its been over a month. The part is covered under the extended warranty I had on my vehicle but I have not been able to drive my mustang due to the dealership stating if I operate my vehicle and due any further damage to it they will not cover it. Kinda at a lose as to how to handle this and is there possibly something else causing the PCMs to fail in my vehicle?
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Old 10-29-2017, 01:15 PM   #2
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Take it to another dealer. 1 bad pcm can happen , but 3 in a row would be light winning the lottery big time. Sounds like they did not diagnose it right. Could be a wiring issue frying the board when they put it in or there is nothing wrong with them. These kind off pcm/ electrical issues are hard to diagnose and could easily stump a senior tech.


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Old 10-29-2017, 01:18 PM   #3
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A short on the pcm circuit without much load can fry a pcm easily


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Old 11-01-2017, 02:11 AM   #4
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Thank you for the replies and I plan on taking it to another dealership to get it diagnosed for the issues you guys mentioned.
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Old 11-01-2017, 06:15 AM   #5
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No problem . Hopefully they get it fixed for you .


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Old 11-03-2017, 02:32 PM   #6
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I would definitely have the wires checked. My other mustang is a Boss 302. I had a check engine code come up for low voltage O2 sensor. They replaced that, still came back on. Ford said it was the PCM. They had to ship it to Ford racing. Ford racing worked on my PCM twice. Turns out after 3 months of them getting my PCM to work (they lost it, then they miss programed it) turned out to just be bad wiring!

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