Powertrain, shared range

P34AB A Camshaft Position Actuator Temperature Sensor Circuit High Bank 2

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modePossible

P34AB stands for a voltage above the upper limit at the temperature sensor of intake cam actuator A, bank 2. An interrupted signal or ground line is the classic cause, as is a short to a higher voltage; a plug pushed off during a service visit often explains it. Because the actuator motor warms up under load, the controller depends on this value – the Aisin patent lowers the current step by step while a high temperature persists – and without it the bank 2 phaser is usually held back. NTN-SNR names the code for the inlet side of the second bank; no carmaker publishes it. The bank 1 equivalent is P34A7, the low code P34AA.

Likely causes

Plug at the actuator off or not latched after service
Signal or ground wire interrupted
Signal shorted to a higher voltage

Symptoms

  • Check engine light on
  • Intake phasing on bank 2 held back

Repair estimate

DifficultyMediumDIY possible
Parts and labour€50–750
Time0.5–3 h

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

Parts involved

cam actuator a temp sensor b2sensor wiring

Related codes

P34A8P34A9P34AAP34A7P34BB

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