Powertrain, shared range

P34C7 B Camshaft Position Actuator Control Circuit Driver Current/Temperature Too High Bank 2

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modePossible

P34C7 closes the group of four driver-load codes: on bank 2 the power stage of the exhaust-side actuator B reports current or temperature above its limit. NTN-SNR ties it to outlet adjustment on the second bank. It is the rarest of the set, because electric phasers have so far appeared on the intake side; no public manufacturer document names P34C7. The fault type means the module is guarding itself, not that a sensor reads wrong, since position and temperature sensor faults of this actuator have their own codes (P34C0 to P34C3, P34B8). Plausible triggers are a motor working against a seized or poorly oiled phaser, a short in its wiring, or a driver that runs hot because it sits close to the exhaust side. CARB treats such phasers as monitored outputs. Driving continues, just with exhaust timing locked. Bank 1: P34C6.

Likely causes

Bank 2 exhaust phaser seized or poorly lubricated
Motor wiring of actuator B, bank 2, shorted or heat-damaged
Driver overheating from poor cooling or a module fault

Symptoms

  • Check engine light on
  • Bank 2 exhaust timing no longer varied
  • Usually only small changes in how the engine runs

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 b2cam actuator b b2

Related codes

P34C6P34C5P34C8P34B8P34C0P0023

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