Powertrain, shared range

P34C8 Camshaft Position Control Module Performance

Check engine lightOn
EmissionsRelevant
Drive cycleRequired
Limp modePossible

P34C8 does not point at one actuator or bank; it says the separate controller for cam adjustment is not working properly in itself. Mitsubishi defines it for the 2022 Outlander: with the ignition on, the controller of the electric intake phaser detects an internal CPU error, and the module is the only listed cause. Fail-safe then parks the electric intake motor and the exhaust oil control solenoid at their reference angle, lets the runner flap open, stops EGR, drops stratified cold starts and runs idle at a set speed. Mercedes-Benz lists P34C800 for M176/M177 V8s as a general CAMTRONIC fault (LI05.20-P-080192), with a software update, newer actuators and a check for heat-damaged harness as remedy. Unlike P34C4 to P34C7, which judge one output stage, this code concerns the module as a whole.

Likely causes

Internal processor fault in the cam adjustment control module
Outdated control software (Mercedes M176/M177: update)
Module supply or harness heat-damaged or with poor contact

Symptoms

  • Check engine light on
  • Cam phasing held at its reference position
  • Rougher cold start and fixed idle speed
  • Noticeably less torque, higher fuel use

Repair estimate

DifficultyMediumWorkshop job
Parts and labour€100–1,000
Time0.5–2.5 h

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

Parts involved

cam position control module

Related codes

P34C4P34C5P34C6P34C7P0606P34AC

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