P266D"A" Rocker Arm Actuator Position Sensor Circuit High (Bank 2)
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- How the car detects it
- P266D is logged when the bank 2 position feedback of rocker arm actuator A climbs above its upper limit. Typical reasons are an interrupted sensor ground, a signal wire chafed through onto a supply line, or corrosion that raises resistance. Since the value no longer represents a reachable actuator position, the engine controller discards it. No manufacturer documents P266D publicly; the requirement to detect it comes from CARB's monitoring rules for variable valve lift components. Only engines with position-sensed actuators on both banks could ever set it. Diagnosis starts with reference voltage and ground at the bank 2 sensor plug. Related: P266C, P264D.
- What you may notice
- MIL on
- Lift on bank 2 frozen
- Reduced power
- Likely causes
- LikelyInterrupted ground of the bank 2 sensor
- PossibleSignal wire chafed onto a supply line
- RareCorroded terminals raising circuit resistance
- 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: €80 – €650
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.