Powertrain, shared range

P34B9 B Camshaft Position Actuator Temperature Sensor Range/Performance Bank 2

Check engine lightOn
EmissionsRelevant
Drive cycleRequired
Limp modePossible

With P34B9 the bank 2 exhaust actuator reports a temperature that is electrically valid but does not make sense. A two-bank engine offers an obvious yardstick: after a long cold soak both exhaust actuators should read almost the same, and under equal load they should warm alike. Whether any carmaker applies such logic to P34B9 is not published; the code appears only in lists such as the one from NTN-SNR. CARB requires VVT input components to be checked for rationality where feasible, not just for open and shorted circuits. A drifting sensor, a contact resistance that shifts the reading or outdated module software are the plausible causes. In Aisin's design a false hot value would cut motor current needlessly. Bank 1: P34B5.

Likely causes

Bank 2 actuator temperature sensor drifting
Contact resistance at the plug shifting the value
Module software outdated

Symptoms

  • Malfunction indicator lamp lit
  • Usually no change in driveability

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 b2

Related codes

P34B5P34B8P34BAP34BBP34A9

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