Powertrain, shared range

P34C4 A Camshaft Position Actuator Control Circuit Driver Current/Temperature Too High Bank 1

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modePossible

P34C4 is logged when the output stage feeding the bank 1 intake actuator A reports that its current or its own temperature has passed the permitted limit. The code belongs to electric phasers, where a small motor instead of an oil valve turns the camshaft. An Aisin patent shows the protective logic: a current sensor and a board temperature sensor sit on the motor driver, and if the board stays hot the controller first eases the motor off its end stop and later cuts the current. NTN-SNR files P34C4 under inlet adjustment, bank 1. Nissan drives both intake cams of the 2018 Pathfinder electrically from a separate module (NTB18-016), yet no public manufacturer text covers P34C4 itself. A binding phaser, sludged oil or a shorted motor winding are typical triggers. Bank 2 is P34C5.

Likely causes

Phaser stiff or held against its stop, motor draws high current for long
Low or sludged engine oil making the phaser hard to turn
Winding or motor lead of the bank 1 actuator shorted
Output stage or its sensors in the phaser control module faulty

Symptoms

  • Check engine light on
  • Intake timing on bank 1 no longer adjusted, held at a fixed angle
  • Weaker pull at low revs, rougher idle on a cold engine

Repair estimate

DifficultyHardWorkshop job
Parts and labour€80–1,200
Time0.5–4 h

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

Parts involved

cam actuator a driver b1cam actuator a b1

Related codes

P34C5P34C6P34C8P34A4P34ACP0010

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