OBD-II code · Powertrain (manufacturer / generic)
P34B4 B Camshaft Position Actuator Temperature Sensor Circuit Bank 1
Generic electrical fault on the temperature sensor of the exhaust camshaft position actuator on bank 1. The camshaft position sensor identifies which cylinder is on the compression stroke — without it the ECM cannot run sequential injection or coil-on-plug ignition correctly.
Is it safe to drive with P34B4?
Usually safe for short trips, but don’t ignore it: the underlying fault can get more expensive over time.
Common causes
- Most likelyTemperature sensor failed
Symptoms
- Check engine light on
- Power loss especially in mid-rpm range
- Possible rough idle or stalling
- Increased fuel consumption
Repair at a glance
- Difficulty
- Hard
- DIY friendly
- Best left to a mechanic
- Typical labour
- 1.5–6 h
- Emissions test
- Likely to fail
- After the fix
- A drive cycle is needed before the light stays off
- Parts involved
- Cam Actuator B Temp Sensor B1, Sensor Wiring
Related codes
- P34A4A Camshaft Position Actuator Temperature Sensor Circuit Bank 1
- P34A8A Camshaft Position Actuator Temperature Sensor Circuit Bank 2
- P34B8B Camshaft Position Actuator Temperature Sensor Circuit Bank 2
- P34B1A Camshaft Position Actuator Position Sensor A Range/Performance Bank 2
- P34B2A Camshaft Position Actuator Position Sensor A Circuit Low Bank 2
- P34B3A Camshaft Position Actuator Position Sensor A Circuit High Bank 2
- P34B5B Camshaft Position Actuator Temperature Sensor Range/Performance Bank 1
- P34B6B Camshaft Position Actuator Temperature Sensor Circuit Low Bank 1
- P34B7B Camshaft Position Actuator Temperature Sensor Circuit High Bank 1
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.