Powertrain, shared range

P34C2 B Camshaft Position Actuator Position Sensor A Circuit Low Bank 2

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modePossible

Mercedes-Benz documents this code as P34C200: on cylinder bank 2, the feedback line of CAMTRONIC exhaust solenoid 1 is grounded. The code is one of sixteen that bulletin LI05.20-P-080192 groups together for engine types M176 and M177, found in AMG 63 models as well as S-Class, G-Class and GLS cars. Since heat damage turned up on wiring that runs over the firewall beside the windscreen, a harness inspection comes first, before parts are replaced; Mercedes also wants actuators with the older numbers ending 02 03, 16 00, 03 03 and 17 00 exchanged for the current versions and the engine software updated. A low signal can also come from an actuator with internal damage. Bank 1 low: P34BE; bank 2 high: P34C3.

Likely causes

Harness near the windshield heat-damaged, signal to ground
Sensor in the bank 2 CAMTRONIC actuator shorted
Engine control software outdated

Symptoms

  • Check engine light on
  • CAMTRONIC limp-home, exhaust lift on bank 2 fixed

Repair estimate

DifficultyHardWorkshop job
Parts and labour€100–1,500
Time1–5 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

P34BEP34C0P34C1P34C3P2B4D

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