P264D"A" Rocker Arm Actuator Position Sensor Circuit High (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
- With P264D the position signal of actuator A on bank 1 reads above its plausible maximum. An open ground return, a signal line touching the 5 V or battery feed, or water in the connector can push it up. Because a reading at the upper stop looks like an impossible position, the controller rejects it and runs a fixed lift. No public manufacturer documentation gives a threshold; the regulatory basis is CARB's demand to check every input of a variable lift system for out-of-range values. Toyota's Valvematic engines show that such feedback exists, though Toyota files its sensor faults under the B codes. Compare with P264C (low) and P264E (intermittent).
- What you may notice
- MIL on
- Engine runs on a fixed lift setting
- Noticeably less power
- Likely causes
- LikelyOpen sensor ground
- PossibleSignal wire shorted to 5 V or battery voltage
- RareWater ingress in the sensor connector
- 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 – €600
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.