GLC Class (X253) Produced 2016-2022

Camshaft Position Sensor & Solenoid Issue 2020 GLC 300

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Old Mar 15, 2025 | 01:42 PM
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Camshaft Position Sensor & Solenoid Issue 2020 GLC 300

I recently got a check engine light on my 2020 GLC 300. The car has lost most of its power and accelerates extremely slowly.

Using a scanner, I got the codes P34AD, P34AE, P003C which all point to the camshaft position sensor and solenoid. I replaced both sensors and both solenoids, but that didn't seem to fix anything.

I'm beginning to suspect the wiring harness, however, before I investigate further I though I'd ask around. Has else dealt with an issue like this before?
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Old Mar 15, 2025 | 02:43 PM
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Look into the cam sensor, cam magnet and ECU harness connectors for signs of oil. If oil is present, clean oil away using aerosol contact cleaner.
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Old Mar 15, 2025 | 03:06 PM
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Didn't find any oil, though I'll probably spray some contact cleaner in there just in case.

Does anyone have the pinout/wiring diagram for the ECU? I'd like to verify continuity in the wires.
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Old Mar 16, 2025 | 04:45 PM
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Originally Posted by chassis
Look into the cam sensor, cam magnet and ECU harness connectors for signs of oil. If oil is present, clean oil away using aerosol contact cleaner.
Why contact cleaner?
DeOxit, for example, would leave a coating that would hide future leaks.
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Old Mar 16, 2025 | 07:24 PM
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Not all contact cleaners leave residue. For example, I bought a can of WD-40 "Specialist" contact cleaner that claims to leave no residue.
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Old Sep 22, 2025 | 06:58 PM
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2021 A220
having the same issue, do you have an update on yours? thanks
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Old Oct 3, 2025 | 09:25 PM
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Originally Posted by willmurray461
I recently got a check engine light on my 2020 GLC 300. The car has lost most of its power and accelerates extremely slowly.

Using a scanner, I got the codes P34AD, P34AE, P003C which all point to the camshaft position sensor and solenoid. I replaced both sensors and both solenoids, but that didn't seem to fix anything.

I'm beginning to suspect the wiring harness, however, before I investigate further I though I'd ask around. Has else dealt with an issue like this before?
what did you find out? I’m having same issues on mine, leaning towards camshaft replacement
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Old Oct 26, 2025 | 09:55 AM
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Originally Posted by jamesmeade226
what did you find out? I’m having same issues on mine, leaning towards camshaft replacement

Did you have the car scanned? Year and Mileage on vehicle?
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