P34BDB Camshaft Position Actuator Position Sensor A Range/Performance Bank 1
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- Needs a drive cycle to confirm a fix
- How the car detects it
- P34BD has a documented user. Mercedes-Benz lists P34BD09 in bulletin LI05.20-P-080192, dated 14 January 2026, for M176/M177 V8 engines with CAMTRONIC, used for example in the AMG C 63 and E 63, the G 550 and the Maybach GLS 600. Its fault text reports the feedback from exhaust-side CAMTRONIC solenoid 1 of bank 1 as faulty and classes it as a component fault. Mercedes names software and hardware as the cause: update the ME engine control unit, check the part numbers of all CAMTRONIC actuators and replace older ones (A177 982 03 03 or 17 00 by 19 00, 02 03 or 16 00 by 18 00), and look for heat-damaged wiring at the bulkhead. P005A (exhaust solenoid 1 jammed off) and the limp-home code P164B often come along. Bank 2: P34C1.
- What you may notice
- Check engine light on
- CAMTRONIC in limp-home mode, often with further CAMTRONIC codes
- Likely causes
- LikelyEngine control software outdated (Mercedes M176/M177: update)
- LikelyCAMTRONIC actuator of a superseded part number
- PossibleHarness heat-damaged above the bulkhead
- 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: €150 – €1,500
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.