Powertrain, shared range

P34C0 B Camshaft Position Actuator Position Sensor A Circuit Bank 2

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modePossible

P34C0 is the generic circuit fault of position sensor A belonging to camshaft actuator B of bank 2 and therefore appears only on V-type or other two-bank engines. Mercedes-Benz files the bank 2 exhaust feedback of its CAMTRONIC V8 (M176/M177) under neighbouring codes – P34C1 for an implausible signal, P34C2 for a grounded one – but P34C0 itself is absent from its bulletin, and no other carmaker has published it. Diagnosis therefore stays general: supply, ground and signal line between module and actuator, then the actuator with its built-in sensor. If P34BC is set as well, shared feeds and grounds deserve a look before any part is swapped. NTN-SNR describes P34C0 as an electrical fault at the outlet side. The remaining fault types for this sensor are P34C1 to P34C3.

Likely causes

Wiring or plug at the bank 2 exhaust actuator open
Shared sensor feed or ground faulty (if P34BC is also stored)
Sensor in the bank 2 actuator failed

Symptoms

  • Malfunction indicator lamp lit
  • Exhaust adjustment on bank 2 disabled

Repair estimate

DifficultyMediumWorkshop job
Parts and labour€80–1,300
Time0.5–4.5 h

Typical range across vehicles; the real cost depends on what the testing finds.

Parts involved

cam actuator b pos sensor b2sensor wiring

Related codes

P34BCP34C1P34C2P34C3P34B0P2B4B

References: law.cornell.edu, ntn-snr.com, static.nhtsa.gov.