Code P0342

Tiny
5.3CHEVYSILVERADO
  • MEMBER
  • 2004 CHEVROLET SILVERADO
  • 5.3L
  • V8
  • 2WD
  • AUTOMATIC
  • 282,000 MILES
I’ve replaced the cam position sensor 4 times, replaced the connector still has code and idles terrible. What else do I need to do this is the only code I have?
Sunday, February 20th, 2022 AT 9:46 AM

1 Reply

Tiny
AL514
  • MECHANIC
  • 4,632 POSTS
Hello, if you've replaced the camshaft position sensor that many times and the pigtail (connector), then there's another issue going on. The first thing to do is check that you have 12-volt feed to the sensor. I'll put the wiring diagrams below, the red wire is the 12-volt Ignition feed that comes from the engine computer (ECM). Check that with the key on engine off. This engine will run without a cam sensor signal, it will use the crankshaft position sensor to fire the fuel injectors and ignition coils. But can run rough and have an extended cranking time.
The first diagram is the cam sensor connector so you can check the 3 different pins on it. The 2nd diagram is some potential causes of this code.
There also may be an updated sensor from the dealership but checking the reluctor wheel first is important. It's the wheel that has a tooth on it that triggers the camshaft position for the #1 Cylinder (top dead center). I'm not sure on these if you can see inside if you pull the sensor out and rotate the engine by hand slowly until the reluctor wheel tooth comes around so you can see if it's bent or damaged in any way. I believe these ones are at the rear of the engine near the bell housing
Did you put an aftermarket sensor in or one from the dealership?
Usually for diagnosing a cam sensor fault like this where the ECM is not seeing the signal, we would use an oscilloscope to check the voltage waveform, so unless you have one, the most you can really do is make sure the sensor has 12 volts on the Red wire, very close to 0 volts on the pink/black wire which is its low reference (Ground).
And the brown/white wire is the signal going back to the ECM, you might be able to check for a pulse or flash with a 12-volt automotive test on the signal wire while cranking or running the engine. If you have your own scan tool that you can observe the live data, there might be a data pid for the sensor.
But check the sensors Power and Ground first, with the other multimeter lead on the battery negative post.
If you have any questions about testing just ask, and I'll see if there's any Technical Service Bulletins on the Cam Sensor.

https://www.2carpros.com/articles/how-to-use-a-test-light-circuit-tester

https://www.2carpros.com/articles/how-to-use-a-voltmeter
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Sunday, February 20th, 2022 AT 10:51 AM

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