Powertrain, shared range

P34C6 B Camshaft Position Actuator Control Circuit Driver Current/Temperature Too High Bank 1

Check engine lightOn

EmissionsRelevant

Drive cycleNot required

Limp modePossible

P34C6 concerns actuator B, which NTN-SNR assigns to the exhaust camshaft, on bank 1: the stage driving it signals overcurrent or overheating. That presumes an electrically powered exhaust phaser, and none is documented in public sources. The 2022 Mitsubishi Outlander shifts its exhaust camshaft hydraulically via a solenoid valve, which fail-safe holds at a reference angle, and Mercedes-Benz uses B-side codes on its M176/M177 V8 only for CAMTRONIC position feedback, not for driver load. So no manufacturer is known for this code. Should it appear, the logic of the Aisin patent applies: a hot driver board or a motor fighting a stiff phaser pushes current up, and the controller backs off or switches the motor off. Exhaust timing then rests at its default, which mainly costs smoothness and some economy. Bank 2: P34C7.

Likely causes

Exhaust phaser on bank 1 stiff, motor overloaded

Short in the motor wiring of actuator B, bank 1

Output stage for actuator B damaged or overheated

Symptoms

Check engine light on
Exhaust cam timing on bank 1 fixed in its default position
Slightly higher fuel use, minor loss of smoothness

Repair estimate

DifficultyHardWorkshop job

Parts and labour€80–1,300

Time0.5–4 h

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

Parts involved

cam actuator b driver b1cam actuator b b1

Related codes

P34C7 P34C4 P34C8 P34B4 P34BC P0013

References: law.cornell.edu, ntn-snr.com, patents.google.com, mitsubishitechinfo.com.