P3463Cylinder 8 Exhaust Valve Control Circuit Low
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- How the car detects it
- P3463 would mean that the control line of a dedicated cylinder 8 exhaust actuator is shorted to ground. No manufacturer documents this code publicly. On the only engines with documented cylinder 8 deactivation, GM's L84 and its relatives, one solenoid handles both valves, and GM reports a ground short on it as P3459, testing for less than 0.5 ohm to ground with the driver off. NHTSA's summary of the system lists solenoid driver circuit faults among the reasons the ECM inhibits deactivation, which is also what a driver would notice here: the engine keeps all eight cylinders running and uses a little more fuel. P3461 covers an open, P3462 the function and P3464 a short to power in this exhaust group.
- What you may notice
- Check engine lamp on
- Engine stays on all eight cylinders
- Likely causes
- PossibleCylinder 8 exhaust actuator wire shorted to the engine block
- PossibleExhaust actuator shorted to ground internally
- RareDriver stage in the engine control module faulty
- 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.