P3466Cylinder 9 Deactivation/Intake Valve Control Performance
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Needs a drive cycle to confirm a fix
- How the car detects it
- P3466 is the plausibility test for cylinder 9: its actuator circuit is electrically sound, yet the cylinder fails to change state when the engine computer commands it. No manufacturer documents this code publicly; J2012 reserves the codes for cylinders 9 to 12 for engines with more than eight cylinders. In valve-based systems the switching happens hydraulically; NHTSA's account of GM's design describes oil pressure moving locking pins inside the lifter. The Mercedes M137 V12, whose shut-off system relied on a solenoid pack and oil pressure tubes, is known for trouble with exactly those parts, exactly the kind of fault this code targets. Bank-switching V10 and W12 engines from Audi and Bentley leave the valves running and have nothing comparable to check. P3465, P3467 and P3468 are the electrical faults of cylinder 9.
- What you may notice
- Check engine lamp on
- Misfire count on cylinder 9 (P0309)
- Rough running while switching between full and partial mode
- Likely causes
- LikelyOil level, pressure or quality too poor to switch cylinder 9
- PossibleLeak at the oil tubes or solenoid pack feeding cylinder 9
- PossibleSwitching lifter of cylinder 9 sticking
- RareSolenoid valve slow or sticking mechanically
- 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: €100 – €3,500
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.