P2B48B Camshaft Position Actuator Position Sensor B 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
- P2B48 is the plausibility code for sensor B at the bank 1 exhaust actuator (camshaft B): the circuit works, yet the reported position contradicts the command. Mercedes handles this fault type on its CAMTRONIC V8s for the exhaust sensor of solenoid 1 as P34BD and fixes it through software and newer actuators; P2B48 itself is not found in any public manufacturer source. GM's L3B gives an idea of the logic under P2C13: the exhaust Hall feedback must pass through three states per shift, and a signal without a shift command also counts as an error. Carbon or sludge on the actuator pin, worn parts or a damaged shift groove can cause the mismatch. Bank 2 counterpart: P2B4C.
- What you may notice
- Check engine light on
- Exhaust lift switching held in one position
- Possibly rough running during shift attempts
- Likely causes
- LikelyActuator pin sticking from deposits or wear
- PossibleOutdated engine control software
- RareShift groove or cam sleeve damaged
- 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 – €900
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.