P0343

Tiny
THI
  • MEMBER
  • CHEVROLET SUBURBAN
2001 Suburban, 71,000 miles, vortex 8100

Code P0343
camshaft position sensor A - bank 1 circuit high imput

okay now that I have read the code what do I do?
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Saturday, May 12th, 2007 AT 4:54 PM

10 Replies

Tiny
SERVICE WRITER
  • EXPERT
If the only problem is that the CEL is on and no drivabilty problems present, then I would follow a TSB that says to replace the Cam sensor with part number 12572656.
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Sunday, May 13th, 2007 AT 10:10 AM
Tiny
JHAWK7783
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I have same code except my 2000 suburban abruptly stopped running and won't restart. I also get DTC P0108--MAP/BARO circuit high output. ?Replace both or replace CMP first? I appreciate any advice or help. Thanks.
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Sunday, September 23rd, 2007 AT 1:21 PM
Tiny
SERVICE WRITER
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Is that a 5.3 motor?
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Monday, September 24th, 2007 AT 8:53 AM
Tiny
JHAWK7783
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Yes, sorry. Year 2000 suburban 1500 (2WD), 5.3 engine, 211,000 miles. DTC code 0108 came on the same time. ?Replace both? Or MAP first. The CMP is a real pain to reach. Again, thanks for any help or advice.
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Monday, September 24th, 2007 AT 12:44 PM
Tiny
SERVICE WRITER
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Just for clarification, the starter cranks, but combustion doesn't happen. Or nothing happens when you turn the key.

I would treat this as a no start, but not follow the path of the Codes on this one. Checking either code starts with testing with the engine idling.

Start simple and check all the fuses and maxi fuses. There are a couple fuseboxs, and I think they are different between the new body stayle and the old.
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Monday, September 24th, 2007 AT 6:06 PM
Tiny
JHAWK7783
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Thanks. I'll check all fuses again. The starter engages and engine turns but won't start. My inexpensive scan tool indicates P0108 and P0343.
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Tuesday, September 25th, 2007 AT 7:37 AM
Tiny
JHAWK7783
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Another question? Both of these codes are defined as "sensor circuit high voltage." Does this mean that the sensor has failed and the diagnostic circuitry is reading a high voltage output from the sensor? Thanks
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Tuesday, September 25th, 2007 AT 8:29 AM
Tiny
SERVICE WRITER
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I may be that the sensor(s) are bad, but it may not be. That's why I would treat it as a no start diagnosis first. Find out if your losing spark and fuel or if timing is a problem. The Cam sensor may very well be the problem, however I have seen other problems kick up the code like a broken valve spring. Granted there were misfire codes also in that situation.

As far as the high voltage, the sensor sends it's values of what it is measuring in volts. There may really be a reason for it reading high volts. Since you are cranking it and it isn't firing you have a reason for it to throw this code.

Spray some starting fluid or carb cleaner into the throttle bore and then crank it. What does it do?

Still didn't run for a minute off the cleaner, pull a plug and have the the plug near a grounded part and see if it sparks when cranking. Really should use a spark tester.
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Tuesday, September 25th, 2007 AT 7:09 PM
Tiny
JHAWK7783
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Saturday, October 6th, 2007 AT 9:58 AM
Tiny
JHAWK7783
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Double checked both fuse boxes. I have fuel to both fuel rails and odor of gasoline when cranking engine. There is spark at two different cylinders. Spraying carb cleaner into intake manifold didn't help. Replaced CMP sensor, didn't help. No broken wires at CMP connector. Is a short circuit in wires to CMP the next most likely problem. Thanks, appreciate help.
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Saturday, October 6th, 2007 AT 10:08 AM

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