P2B4FA Camshaft Profile Actuator B Control Performance/Stuck Off 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
- P2B4F covers the second profile actuator (B) on the intake camshaft of bank 1, a solenoid whose pin engages a groove on a sliding cam sleeve to change valve lift. Despite the title wording, GM's L3B 2.7-litre four (19OBDG03D, again in 25OBDG03B) uses it for the reverse case: a Hall element reports three pin states (extending 55, extended 45, retracted 68), and if the signal falls below 55 although no shift was commanded, the pin has fired on its own. Four wrong readings in five cylinder events with the engine running and more than 11 V set a Type A fault, MIL at once. The supplier NTN-SNR lists the code as actuator never active. A pin stuck out on the same actuator is P2B53; wiring faults sit under P2B33–P2B35.
- What you may notice
- MIL on in the first drive with the fault
- Intake lift switching locked out, less pull or higher consumption
- Cylinder deactivation no longer available
- Likely causes
- LikelyActuator B pin extends without a command (sticking solenoid, weak return spring)
- PossibleHall feedback of the actuator delivers wrong pin states
- RareShift groove on the cam sleeve worn so the pin is dragged out
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Medium · Usually a job for a workshop.Typical cost: €80 – €700
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.