P34B8B Camshaft Position Actuator Temperature Sensor Circuit Bank 2
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- How the car detects it
- P34B8 is the circuit fault for the heat sensor inside exhaust camshaft actuator B of bank 2, the row without cylinder 1 on a V or flat engine. If P34B4 is stored at the same time, a shared feed, a common ground or the control module is more likely than two failed sensors at once. The code family presumes an electrically driven exhaust phaser with its own heat-sensitive driver: NTN-SNR files it under outlet camshaft adjustment, and Aisin's patent explains why such a driver carries a temperature sensor at all. A carmaker using P34B8 could not be found in bulletins or official service information. In practice: check plug and harness on bank 2 first, then the actuator itself. For a signal stuck low or high on bank 2 see P34BA and P34BB.
- What you may notice
- Malfunction indicator lamp lit
- Exhaust phasing on bank 2 restricted, banks may run slightly unevenly
- Likely causes
- LikelyConnector or harness at the bank 2 exhaust actuator open
- PossibleShared supply or ground faulty (when bank 1 also reports)
- PossibleTemperature sensor in the bank 2 actuator failed
- 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 – €850
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.