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.
Medium severity. Can I keep driving?Drive little and gently. If you hear timing chain noise or the oil light comes on, shut off the engine.
Bank 1 is the side of the engine with cylinder 1. Inline engines only have this bank.
Symptoms
- Check engine light on
- Exhaust lift switching held in one position
- Possibly rough running during shift attempts
Most likely causes
- Actuator pin sticking from deposits or wear
- Outdated engine control software
- Shift groove or cam sleeve damaged
What to check, in order
Start with the simplest. You can tick off each step.
Good to know
- Repair difficulty: hard
- It can trigger limp mode.
- It affects emissions.
What each character of P2B48 means
- P: Powertrain: engine and transmission
- 2: Generic code: same on every make
- B: Subsystem depends on the code range
- 48: Specific fault in that system
Frequently asked questions
Can I keep driving with code P2B48?
Drive little and gently. If you hear timing chain noise or the oil light comes on, shut off the engine.
What causes code P2B48?
The most common causes are: actuator pin sticking from deposits or wear; outdated engine control software; shift groove or cam sleeve damaged.
Related codes
- P2B40A Camshaft Position Actuator Position Sensor B Range/Performance Bank 1
- P2B47B Camshaft Position Actuator Position Sensor B Circuit Bank 1
- P2B49B Camshaft Position Actuator Position Sensor B Circuit Low Bank 1
- P2B4AB Camshaft Position Actuator Position Sensor B Circuit High Bank 1
- P2B4CB Camshaft Position Actuator Position Sensor B Range/Performance Bank 2
- P34BDB Camshaft Position Actuator Position Sensor A Range/Performance Bank 1
- P03F7B Camshaft Position Actuator Position Sensor C Range/Performance Bank 1
Sources
- law.cornell.edu: 13 CCR 1968.2
- ntn-snr.com: TECHinfo CMP UK
- static.nhtsa.gov: MC 11027678 0001
- gsi.ext.gm.com: 19OBDG03D Diagnostics
Values and procedures vary by manufacturer. If it affects brakes, steering, fuel or high voltage, see a professional. Updated: 2026-11-04. How we build these pages.