P34BEB Camshaft Position Actuator Position Sensor A 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
- For P34BE, too, a Mercedes-Benz text exists: the CAMTRONIC bulletin covering the M176 and M177 eight-cylinders reads P34BE00 as the signal of exhaust solenoid 1, bank 1, being grounded. That fits the generic meaning, a signal under its lower limit. Mercedes points to the engine cover and the wiring routed over the bulkhead, close to the windshield, where heat damage was found; harness damage is to be reported with photos and a lambda graph test. Beyond the wiring, the remedy includes fitting the latest CAMTRONIC actuators and updating the engine software. Once the feedback is lost the system can enter limp-home (P164B), and the exhaust cam profile of that bank stays fixed. High on bank 1: P34BF; low on bank 2: P34C2.
- What you may notice
- Check engine light on
- CAMTRONIC limp-home, exhaust valve lift on bank 1 no longer switched
- Likely causes
- LikelyHeat-damaged harness above the bulkhead, signal shorted to ground
- PossibleSensor inside the CAMTRONIC actuator shorted (older part number)
- RareEngine control software not up to date
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Hard · Usually a job for a workshop.Typical cost: €100 – €1,500
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.