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P0342 CAM Sensor Replacement?

Tiny
RICHG922
  • MEMBER
  • 2005 CHEVROLET SILVERADO
  • V8
  • 4WD
  • AUTOMATIC
  • 12,975 MILES
I am having trouble starting my truck. Finally logged a P0342 code calling out cam sensor. Where is it located and how do I replace it? Can I test it beofre buying the new part? Ohm test?
Monday, January 25th, 2010 AT 5:46 PM

23 Replies

Tiny
SCOTTY DEE
  • MECHANIC
  • 592 POSTS
You are going to need a scan tool to read parameter identification. Also will need to disconnect the sensor a verify 12 volt reference. If there are no short to grounds, or other wiring issues and no debris between the sensor and the reluctor ring, you could have a bad CMP sensor or in the worst case a bad PCM. The sensor is located behind the #2 knock sensor on top of the lower plenum. Here is the location of the camshaft sensor in the diagrams below. Check out the diagrams (Below). Please let us know what happens.
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Tuesday, January 26th, 2010 AT 3:02 PM
Tiny
RICHG922
  • MEMBER
  • 4 POSTS
Had the code read with the scanner tool but no parameter reference. Where is the reluctance ring?
Where would debris come from? Engine has never been touched and only has 13,000 miles?
Thank You
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Tuesday, January 26th, 2010 AT 3:30 PM
Tiny
SCOTTY DEE
  • MECHANIC
  • 592 POSTS
The reluctor ring is on the camshaft. Think of the CMP as a distributor, it's where distributors used to be.

Parameter ID is seeing how the component is acutally functioning via the scan tool. For instance, the PID for CMP, you would want to watch the low to high and the high to low transition.
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Tuesday, January 26th, 2010 AT 3:50 PM
Tiny
RICHG922
  • MEMBER
  • 4 POSTS
Is there a color code for the wire connector so I can correctly test for the presence of the 12 volts? Is the CMP Hall effect or magnetic on this engine?
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Tuesday, January 26th, 2010 AT 5:34 PM
Tiny
SCOTTY DEE
  • MECHANIC
  • 592 POSTS
Test for 12 volt reference at the CMP connector. Hall effect is the measurement of the magnetic field.
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Tuesday, January 26th, 2010 AT 6:02 PM
Tiny
RICHG922
  • MEMBER
  • 4 POSTS
That was confusing but I got a new sensor the truck starts, it runs great. Thank you
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Wednesday, January 27th, 2010 AT 4:01 AM
Tiny
SCOTTY DEE
  • MECHANIC
  • 592 POSTS
Good to hear, please use 2CarPros anytime we are here to help.
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Wednesday, January 27th, 2010 AT 7:19 AM
Tiny
JON BADKER
  • MEMBER
  • 1 POST
  • 2003 CHEVROLET SILVERADO
  • V12
  • 4WD
  • AUTOMATIC
  • 120,000 MILES
Where is the Camshaft Position sensor located?
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Monday, September 7th, 2020 AT 11:46 AM (Merged)
Tiny
MHPAUTOS
  • MECHANIC
  • 31,937 POSTS
Hi there,

Could you please re post with the engine size as there are fitted in different positions depending on size. But I will guess it is a 8.1 Liter and it will be on the left side of the timing cover.

Mark (mhpautos )
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Monday, September 7th, 2020 AT 11:46 AM (Merged)
Tiny
NOEL BEGLEY
  • MEMBER
  • 21 POSTS
  • 2002 CHEVROLET SILVERADO
  • V8
  • 4WD
  • AUTOMATIC
  • 134,000 MILES
CHEV SILVER-ADO VORTEX MOTOR V8 PETROL 2002. Runs rough and service light comes on. Showed diagnostic for air flow and cam sensor zeroed codes then ran and cam sensor code is back. It is O.K when cold but stalls and won't start. Where is the cam sensor found?
Thanks: NOEL.
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Monday, September 7th, 2020 AT 11:47 AM (Merged)
Tiny
WRENCHTECH
  • MECHANIC
  • 20,761 POSTS
What are the exact code numbers being set?
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Monday, September 7th, 2020 AT 11:47 AM (Merged)
Tiny
NOEL BEGLEY
  • MEMBER
  • 21 POSTS
MY SCAN TOOL IS ONE THAT IS CONNECTED TO MY LAP TOP AND IT TELLS ME AIR FLOW CONNECTION FAULT AND CAM SENSOR ELECTRICAL FAULT. AFTER CLEARING THE CODES AND STARTING THE MOTOR THE ENGINE SERVICE LIGHT WAS OFF FOR ABOUT ONE MINUTE AND THEN CAME BACK ON. CHECKED CODES AGAIN AND NOW ONLY CAM SENSOR ELECTRICAL FAULT.
Thanks: NOEL
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Monday, September 7th, 2020 AT 11:47 AM (Merged)
Tiny
WRENCHTECH
  • MECHANIC
  • 20,761 POSTS
If you can't give me code numbers, there is nothing I can do for you.
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Monday, September 7th, 2020 AT 11:47 AM (Merged)
Tiny
NOEL BEGLEY
  • MEMBER
  • 21 POSTS
I will check it again I think a number and letter was before the description of what the fault was.I have looked around the bell housing area for a crank sensor and can't find it. I will be in New Zealand next week and may be able to get what I need in Australia or New Zealand. Will read codes this afternoon.
Thanks: NOEL.
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Monday, September 7th, 2020 AT 11:47 AM (Merged)
Tiny
ERICA D MEREDITH
  • MEMBER
  • 1 POST
  • 2002 CHEVROLET SILVERADO
  • 6.0L
  • 2WD
  • 216,570 MILES
It's not starting up right away you have to really crank it, then it will turn over. It was code P0342. Not sure if that is why my gas gauge keeps saying low fuel even after I have filled the tank up.
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Monday, September 7th, 2020 AT 11:47 AM (Merged)
Tiny
NOEL BEGLEY
  • MEMBER
  • 21 POSTS
Scanned the codes again and it comes up with CODE P1345 SORE DTC Number 1 SGC (Cam Position)SENSOR CIRCUIT MALFUNCTION / CRANKSHAFT POSITION
CAMSHAFT POSITION CORRELATION.
The vehicle is a 350 chev Vortec
VIN 2GEC19R5V1195576 and I think the year should be 1995 not 2002
Thanks for all your assistance so far: NOEL.
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Monday, September 7th, 2020 AT 11:47 AM (Merged)
Tiny
STEVE W.
  • MECHANIC
  • 13,573 POSTS
Two different problems. It sounds like you have a fuel pump and sender problem as well as the cam code. The sensor issue could be a broken or chewed wire or bad connection or even a bad sensor. You would need a scan tool to test it to find the problem. The fuel level problem is the sending unit in the tank, very common for them to fail. For that you either remove the truck bed or drop the fuel tank to get access to the top of the tank, then remove and replace the fuel pump module.
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Monday, September 7th, 2020 AT 11:47 AM (Merged)
Tiny
WRENCHTECH
  • MECHANIC
  • 20,761 POSTS
Just as I suspected, that is not indicating a malfunction in any component. It's telling you that the Cam sensor is not synched with the Crank sensor and that is because the distributor was installed wrong. You need to use a professional scan tool that had a PID for Cam offset and you need to turn the distributor with the engine running until that PID reads "0" degrees. Then the code will not reset.
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Monday, September 7th, 2020 AT 11:47 AM (Merged)
Tiny
WRENCHTECH
  • MECHANIC
  • 20,761 POSTS
That VIN can't be correct either
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Monday, September 7th, 2020 AT 11:47 AM (Merged)
Tiny
NOEL BEGLEY
  • MEMBER
  • 21 POSTS
Sorry got 2 letters wrong in the Vin It should be 2GCEC19R5V1195571
WILL SEE IF WE CAN SET THE DISTRIBUTOR TIMING TOMORROW.
Thanks for all your help. NOEL.
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Monday, September 7th, 2020 AT 11:47 AM (Merged)

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