Codes P0348 and P0393?

Tiny
BRACKD1
  • MEMBER
  • 2010 CHEVROLET CAMARO
  • 3.6L
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 10,000 MILES
Im getting these 2 high voltage codes the bank 2 side of the motor. Inspected and replaced camshaft sensors they are good as well as the crankshaft sensor. So, its leading me to believe that it's in the wiring but I am getting the accurate 5-volts that it's supposed to get so I'm not sure why its reading "high voltage"
Tuesday, February 18th, 2025 AT 11:52 AM

6 Replies

Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 50,261 POSTS
This can be because the camshaft timing is off, can I ask how many miles are on the engine?

P0348 - Camshaft Position Sensor "A" Circuit High (Bank 2)

P0393 - Camshaft Position Sensor "B" Circuit High (Bank 2)

Also, how does the engine sound while running, can you upload a short video of the engine running so I can hear it? This would help me see what's going on.
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Tuesday, February 18th, 2025 AT 6:10 PM
Tiny
STEVE W.
  • MECHANIC
  • 14,039 POSTS
A common reason for a high voltage is if the sensors have a bad ground. To test this, you can test the gray wire for 5 volts and then the tan wire for a ground. If you don't find a good ground, then you will need to go to the PCM and test the grounds there as well. Attached are the wiring diagrams showing the various grounds and powers for the ECU and sensors.
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Tuesday, February 18th, 2025 AT 6:42 PM
Tiny
BRACKD1
  • MEMBER
  • 3 POSTS
I know it's not a timing issue; it's a brand-new motor that has been driven for around 7,000 miles. Brand new timing chain, tensioners, and all. It won't stay running it stalls a second, also it has a long crank, after inspecting the timing chain it looks good and tight and I know its timed perfect. But with that being said, I have had electrical issues with the Camaro before. So I'm leaning towards something to do with the sensors wiring.
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Wednesday, February 19th, 2025 AT 5:42 AM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 50,261 POSTS
A "Circuit High" code is the camshaft is too far advanced so I would replace the camshaft actuator control valve it may not be releasing. Has the engine had this code since the new engine, and when you say new do you mean a create engine from GM?
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Wednesday, February 19th, 2025 AT 10:31 AM
Tiny
BRACKD1
  • MEMBER
  • 3 POSTS
It is a new motor with OEM parts, no it has not had this code since the motor was installed. The motor was installed probably over a year ago now and is just now throwing the code. All the signs are telling me something to do with the wiring.
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Thursday, February 20th, 2025 AT 5:41 AM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 50,261 POSTS
Sounds good, here is a guide to help you check the wiring and the wiring diagrams for the camshaft sensors and oil control valves.

https://www.2carpros.com/articles/how-to-check-wiring

Check out the images (below). Let us know what you find.
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Thursday, February 20th, 2025 AT 10:14 AM

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