P3477Cylinder 10 Exhaust Valve Control Circuit/Open
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- How the car detects it
- P3477 belongs to engines that switch the exhaust valve of cylinder 10 through its own actuator, and it reports that this actuator's circuit is open. No manufacturer documents this code publicly; J2012 reserves the codes for cylinders 9 to 12 for engines with more than eight cylinders. Ten-cylinder engines with shut-off, the Audi R8 V10 and the Lamborghini Huracán, deactivate a bank rather than individual valves; Audi names injection and ignition as what is stopped. GM's patent on valve deactivation shows that the exhaust side has its own timing requirement, with solenoid-driven hydraulic control valves stopping and restarting the exhaust valves ahead of the intake valves. Diagnose as a plain open circuit: connector, wire, coil. P3479 and P3480 are the shorts, P3478 the functional fault, P3473 the intake circuit.
- What you may notice
- Check engine lamp on
- Engine keeps all cylinders active
- Likely causes
- PossibleWire to the cylinder 10 exhaust actuator interrupted
- PossibleExhaust actuator coil of cylinder 10 open
- PossibleCorroded actuator connector
- RareControl module output 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.