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Old 02-01-2010, 04:43 AM   #1
lowazztruck
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P0641 What is this code whats this mean

po641 came up on my car. it says
Referances sensor A voltage ckt/open.
Whats this mean is it a major problem?
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Old 02-01-2010, 04:56 AM   #2
Fox Mulder
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This code indicates a problem with the 5-volt reference circuit for the MAP and oil pressure sensors. It can be caused by a defect in the sensors themselves, internally in the PCM, or wiring.
It is not a common code, in fact this is the first time I've seen it reported. If you have done any modifications to the car that may affect these sensors or the circuit for them I'd check there first. Look for damage to the wiring harness between the engine and PCM.
If you can't find anything on your own then it may have to go to a dealer or shop. Since you are in NJ you can give Frank at Rocksand Racing a call, he may be able to help you.
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Old 02-01-2010, 05:02 AM   #3
lowazztruck
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is this a serious code. should i not drive the car?
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Old 02-01-2010, 06:06 AM   #4
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Hard to say without being able to actually see it and look it over. Most likely not fatal, but can't be certain and given the oddity of this code I'd get it looked at ASAP.
Any chance that varmints have been chewing on the wires?
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Old 02-01-2010, 12:41 PM   #5
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i dont think so it came on out of no where after a 20 min drive then it sat for an hour than i started the car again and the code was there
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