Powertrain, shared range

P34A6 A Camshaft Position Actuator Temperature Sensor Circuit Low Bank 1

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modePossible

With P34A6 the temperature signal from the intake cam actuator on bank 1 sits under its minimum. No source available to us names the sensor type. If it is the usual NTC thermistor, low voltage corresponds to high temperature, so a signal line shorted to ground or an internally shorted sensor looks to the module like an overheated actuator. Electric phasers guard their motor and driver against heat – Aisin describes cutting the current in stages while the board temperature stays high – so a false hot value can make the controller hold the phaser back. NTN-SNR names P34A6 as a too-small signal of the inlet temperature sensor. No carmaker publishes this code in detail. High is P34A7, bank 2 P34AA.

Likely causes

Signal wire shorted to ground (chafed at the cylinder head)
Sensor shorted internally
Actuator really overheated by a sluggish phaser

Symptoms

  • Check engine light on
  • Intake phasing on bank 1 limited, less pulling power

Repair estimate

DifficultyMediumDIY possible
Parts and labour€50–700
Time0.5–3 h

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

Parts involved

cam actuator a temp sensor b1sensor wiring

Related codes

P34A4P34A5P34A7P34AAP34B6

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