codes c5
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Joined: Feb 2012
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From: Boiling Springs SC
codes c5
I have a 2002 C5 and check engine light came on after starting this morrning codes are as follows...
10- PCM. *PO 343 HC.*
BO-RFA. U1000 HC
Thanks in advance for your responses and help.
Reese
10- PCM. *PO 343 HC.*
BO-RFA. U1000 HC
Thanks in advance for your responses and help.
Reese
Race Director
Joined: Jan 2006
Posts: 10,554
Likes: 33
From: Not on either liberal coast.
This should get you started (pun intended)...
http://www.stengel.net/diccodes.htm
I've learned that some codes are the result of a weak battery or grounding points. Make sure your battery is thoroughly charged.
http://www.stengel.net/diccodes.htm
I've learned that some codes are the result of a weak battery or grounding points. Make sure your battery is thoroughly charged.
Racer
Joined: Apr 2009
Posts: 488
Likes: 2
From: Myrtle Beach SC
P0343 is for the camshaft position sensor (CMP) circuit. It sets when the CMP is sending a "high" signal instead of a "low" signal for 1.5 seconds. It could suggest that you have an open or short-to-ground condition in the circuit.
U1000 is a class 2 data link code that typically indicates that the recognition code of a particular module is not recognized by one or more of the other modules. Question: did you recently replace the RFA module,or another module?
Reset the codes, drive the car, and see if either of them come back. If P0343 comes back, you'll need to do some troubleshooting to see if it is a wiring issue or a bad sensor.
HTH
U1000 is a class 2 data link code that typically indicates that the recognition code of a particular module is not recognized by one or more of the other modules. Question: did you recently replace the RFA module,or another module?
Reset the codes, drive the car, and see if either of them come back. If P0343 comes back, you'll need to do some troubleshooting to see if it is a wiring issue or a bad sensor.
HTH
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From: Boiling Springs SC
Tech Contributor
Joined: Oct 1999
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From: Charlotte, NC (formerly Endicott, NY)
I wouldn't worry about the communication code (U1000) right now. Most C5s have those and they don't mean anything other than there might have been a missed recognition signal on the data link. If you see a lot of them that is an indication of a voltage/ground issue but one doesn't necessarily mean much. It definitely will not highlight the area causing a slow start issue even if it did indicate a problem. Focus on the other code.
See attachment for diagnostic procedure.
If you don't have a scan tool then focus on the steps that don't require one or you can work around not having one.
Bill
See attachment for diagnostic procedure.
If you don't have a scan tool then focus on the steps that don't require one or you can work around not having one.
Bill
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Joined: Feb 2012
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From: Boiling Springs SC
Thanks guys. I will try DYI way first if no luck I will take it to someone. Should I park it or is it ok to drive? Only issue is starting sometime starts right up other time 3-4 try's.
Reese
Reese
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Thread Starter
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Joined: Feb 2012
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From: Boiling Springs SC
Would the camshaft position sensor (CMP) circuit prevent from starting or make it hard to start? I did fill up at a shell yesterday normally only BP and I added a large bottle of Techron to fill up. Normally use small bottle. Could this have anything to do with it?
