2021 Chevy Silverado P2C13 Codes

2021 CHEVROLET SILVERADO
114,000 MILES • 2.7L • V6 • 2WD • AUTOMATIC
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TEMARSHALL89
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I took my truck to a Chevrolet dealer three times. They can’t seem to figure out the problem. Check engine light comes on, reduces power, heavy vibration, sputtering when pushing the gas. I get the codes P2C13 and P2C14. When I erase the code and let the truck sit, I can drive without any issues before it decides to come back on again. I have changed the camshaft position sensor and lobe sensor on the driver side 1 and 3. No luck. Just last Sunday February 16th, I changed all 4 coil packs and spark plugs and then today February 20th engine light and codes came back.
Feb 20, 2025 at 7:51 AM
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STRAILER
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GM has issued TSBs addressing engine wiring harness chafing leading to various DTCs, including P2C13 and P2C14.

TSB #21-NA-149, issued in November 2021

P2C13: "B" Camshaft Profile Actuator Position Sensor "A" Circuit High (Bank 1)
P2C14: "B" Camshaft Profile Actuator Position Sensor "A" Circuit Low (Bank 1)

I can tell you from my experience the high and low codes are telling us the camshaft actuators are bad and not holding position. This can be also caused by low or dirty engine oil. If the oil had not been changed, I would do new oil and filter and then clear the codes again. Is the engine making noise at idle?
Feb 21, 2025 at 2:19 AM
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TEMARSHALL89
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Yes, it’s a little louder than normal.
Feb 21, 2025 at 2:21 AM
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STRAILER
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This can be timing chains or a camshaft actuator problem, if you upload a short video of the noise I can tell for sure. How is the engine oil? Also, it could be the camshaft profile actuator position sensor not working correctly., here is the location of the sensor so you can swap it out and then clear the codes after. Check out the images (below). Please let us know what happens.
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Feb 22, 2025 at 3:21 AM
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TEMARSHALL89
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I just got an oil change yesterday and then today the engine light came on with the same symptoms. I will swap out the sensors and see what happens.
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Feb 22, 2025 at 3:54 AM
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STRAILER
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Thanks for the video. Yep, it does sound like you have a chain chain/guide issue which will cause the codes. You can try swapping the sensors, but I think you may have bigger problems. Also, this engine has balance shafts which when they go bad will cause noises and vibrations. Check out the images (below). Please let us know what happens.
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Feb 22, 2025 at 4:31 AM
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TEMARSHALL89
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I swapped the sensors. Code P2C14 popped up after driving a mile.
Feb 23, 2025 at 3:05 AM
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STRAILER
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Yep, it sounds like there are internal issues with the engine, timing chain, camshaft actuator or guide-tensioner issues if the wiring harness from the TSB is okay.
Feb 24, 2025 at 2:46 AM

Suggested Repair

Inspect the engine wiring harness for chafing per GM TSB 21-NA-149. If the harness is sound, diagnose internal timing issues, including the timing chain, guides or tensioners, and camshaft profile actuators. Noise and vibration may also indicate a balance-shaft problem. A recent oil change and camshaft sensor swap did not clear P2C14.

Conversation Summary

A 2021 Chevrolet Silverado sets P2C13 and P2C14 with reduced power, vibration, sputtering, and stalling. Coil packs, spark plugs, and camshaft sensors were replaced, and a fresh oil change did not stop the codes. The expert cited a GM TSB for wiring-harness chafing and, after hearing the engine noise and seeing P2C14 return after a sensor swap, suspected timing-chain, guide, tensioner, camshaft-actuator, or balance-shaft problems if the harness is okay.

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