P3462Cylinder 8 Exhaust 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
- With P3462 the ECM would be saying that the exhaust valve of cylinder 8 ignores deactivation commands even though nothing is wrong electrically. No manufacturer documents this code publicly. GM covers the exhaust side of cylinder 8 on the 2019 L84 with its own code P3190, Cylinder 8 Trapped High Pressure Exhaust Charge: if crankshaft jerk, normalized by engine speed, exceeds a load-dependent threshold while the cylinder is deactivated, the exhaust valve is judged not to have opened, and 66 failures in 100 samples set a Type B code. Ford patented the complementary check for an exhaust valve that keeps opening after deactivation, based on exhaust pressure. Symptoms range from vibration in reduced-cylinder mode to a misfire on cylinder 8 (P0308).
- What you may notice
- Check engine lamp on
- Vibration while cylinders are deactivated
- Misfire on cylinder 8 (P0308)
- Likely causes
- PossibleExhaust lifter of cylinder 8 failing to relock in time
- PossibleOil supply to the lifter gallery insufficient
- RareExhaust-side control valve sticking
- 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.