Powertrain, shared range

P34B5 B Camshaft Position Actuator Temperature Sensor Range/Performance Bank 1

Check engine lightOn
EmissionsRelevant
Drive cycleRequired
Limp modePossible

P34B5 is the rationality check for the temperature reading of exhaust-side actuator B on bank 1: the circuit is intact, yet the value or its behaviour is not believable. CARB asks for such checks on VVT input sensors wherever feasible, ideally catching readings that are wrongly high as well as wrongly low. How a carmaker judges this reading is not public, and no maker publishes P34B5 at all. The intake twin P34A5 shows a likely pattern: Nissan traced cold-start alarms on the 2018 Pathfinder to module software and cured them with an update. The value matters because, in Aisin's patent, a board temperature above a release threshold for a set time moves the phaser off its end stop to cut holding current. Bank 2: P34B9.

Likely causes

Module software judging the value wrongly (update available?)
Temperature sensor in the actuator drifting
Loose contact shifting the reading

Symptoms

  • Malfunction indicator lamp, sometimes only after a cold start
  • No noticeable change in engine behaviour in most cases

Repair estimate

DifficultyMediumWorkshop job
Parts and labour€80–900
Time0.5–3 h

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

Parts involved

cam actuator b temp sensor b1

Related codes

P34B4P34B6P34B7P34B9P34A5

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