P3488Cylinder 11 Exhaust Valve Control Circuit High
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- How the car detects it
- With P3488, the cylinder 11 exhaust actuator line sits too high, most often since the wire has picked up battery voltage. No manufacturer documents this code publicly; cylinders 9 to 12 only exist on engines with nine or more, and J2012 keeps these codes for them. Later V12 and W12 designs give it no job: Bentley's W12 idles a bank of six with its valves still moving, while the Aventador from Lamborghini parks one bank under 135 km/h. Only Mercedes' V12 of around 2000 uncoupled exhaust valves, using two solenoids for that bank. GM's comparable V8 check calls a circuit high below 0.5 ohm to supply while the driver is on, 20 of 25 samples, Type B. The actuator then cannot be engaged, and the engine just runs on all cylinders. P3487 is the ground fault.
- What you may notice
- Check engine lamp on
- Engine stays on all twelve cylinders
- Likely causes
- LikelyControl wire of the cylinder 11 actuator touching a battery feed
- PossibleShorted turns in the actuator coil
- RareOutput stage in the engine control module failed
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Medium · Often possible to do yourself.Typical cost: €60 – €900
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.