Powertrain, shared range

P34AA A Camshaft Position Actuator Temperature Sensor Circuit Low Bank 2

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modePossible

P34AA reports that the temperature sensor of the bank 2 intake cam actuator signals a voltage below its permitted range. Whether that equals a hot reading depends on the sensor design, which no public source names; with the common NTC thermistor it would mimic overheating, and the controller could limit the actuator current or stop phasing on that bank. In practice a signal wire grounded against the cylinder head, cables pinched during earlier engine work or a shorted sensor are the usual suspects. NTN-SNR lists P34AA as too small a signal of the inlet temperature sensor on the second bank; a manufacturer text is not public. Compare bank 1 (P34A6) and the high code P34AB.

Likely causes

Signal wire grounded against the cylinder head
Cables pinched during earlier engine work
Sensor shorted internally

Symptoms

  • Check engine light on
  • Intake phasing on bank 2 suspended, slightly less power

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

P34A8P34A9P34ABP34A6P34BA

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