Sound like a faulty PCM? - Ford Powerstroke Diesel Forum
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Old 02-27-2012, 05:01 PM
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Question Sound like a faulty PCM?

Truck wouldn't start and left me stranded about 2 hours ago. I just got towed home. For about the last year, the truck has been acting funny as far as the interior light goes and and the door ajar warning on the dash. Sometimes while driving down the road, the light will just pop on, and the door ajar light will pop up. Other times, and most often, the interior light stays on for WAY longer than it should after I shut the doors and chirp the electric door locks. I always make sure all the doors are shut and that the interior light roller dial is not engaged.

All this stuff always made me think the PCM was screwy and that it needed to be replaced. Well tonite, I went to start the truck and I could hear the fuel pump charging like it usually does, and the GP light went out, except, when i went to start the truck, it only starting clicking right where the pcm is located. It was NOT a clicking like a dead battery, instead it was coming from pretty much RIGHT where the PCM is.

The funny thing was that it would click when the switch was being pushed forward, and as soon as I let the key pressure back off I could hear it click again.

Does this sound like the PCM? Is there an easy way to test it? Also, if I buy a good used one is there anything I need to know, or can I expect to have it re-programmed?



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Old 02-27-2012, 05:21 PM
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No relays that I know of in the PCM. PCM doesn't click.

I'd say cps because it's the flavor of the forum. Most people say its the cause of all problems. Not a bad place to start for $30. Next would be new batteries or a faulty alternator. Third is fuel pressure.

Beyond that, you need a scanner on that bad boy to rule out engine/PCM issues. Btw, your door chime issue sounds like a weather beaten door switch. Close the door harder, or pull it out and check for corrosion.
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Old 02-27-2012, 06:06 PM
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what's clicking in the interior? It's definitely clicking inside REALLY close to where the pcm is located. The truck ran fine until I came back out from the store and tried to start it.

And it's not clicking like the clicking sound you hear when the battery is going out. It clicks once when you try to start it, and then RIGHT after you release the key back it clicks again.

I can't help but think it's the PCM......
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Old 02-27-2012, 07:26 PM
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i highly doubt it is the pcm. you need to use a quality scanner, and watch all the vitals when cranking.
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