P34B6B Camshaft Position Actuator Temperature Sensor Circuit Low Bank 1
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- How the car detects it
- Circuit Low means the voltage on the signal wire of the exhaust actuator B temperature sensor (bank 1) stays under its lower limit. Which temperature that stands for depends on a sensor curve that no public source gives; with a thermistor whose resistance falls as it warms, a short to ground would look like extreme heat. Aisin's patent shows what a hot reading triggers: the controller lowers the motor current and may even switch the motor off at a preset threshold, so exhaust phasing loses authority. In the NTN-SNR catalogue P34B6 appears as an undersized outlet-side signal. Wires rubbing on the cylinder head and a sensor shorted inside are the main suspects. No carmaker documents P34B6. High: P34B7; bank 2: P34BA.
- What you may notice
- Malfunction indicator lamp lit
- Exhaust phasing on bank 1 reduced, slightly rougher idle possible
- Likely causes
- LikelySignal wire chafed through and touching ground
- PossibleSensor element shorted inside the actuator
- RareActuator driver genuinely overheated by a binding phaser
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Medium · Often possible to do yourself.Typical cost: €50 – €800
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.