Powertrain, shared range

P34B3 A Camshaft Position Actuator Position Sensor A Circuit High Bank 2

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modePossible

P34B3 marks a signal above the upper limit from position sensor A on the intake phaser of bank 2. An interrupted ground, a signal wire touching a supply voltage or a worn-out sensor are the usual findings. No carmaker publishes the code. The nearest documented case is Mitsubishi's bank 1 code P34AF on the 2022 Outlander: the high value must persist for at least a second, and the Hall sensor of the actuator motor is listed as a possible cause. With an electric phaser the sensor therefore sits inside the actuator, and a sensor fault usually means replacing the actuator. NTN-SNR lists P34B3 as the inlet-side position sensor A on the second bank with too high a signal. The engine keeps running with the bank 2 phaser at its base angle.

Likely causes

Sensor ground interrupted
Signal wire touching a supply voltage
Hall sensor in the actuator defective (actuator replacement)

Symptoms

  • Check engine light on
  • Bank 2 intake phaser held at its base angle

Repair estimate

DifficultyMediumWorkshop job
Parts and labour€60–950
Time0.5–3.5 h

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

Parts involved

cam actuator a pos sensor b2sensor wiring

Related codes

P34B0P34B1P34B2P34AFP2B46

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