P3472Cylinder 9 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
- P3472 records a high voltage level on the cylinder 9 exhaust valve control circuit, the pattern of a wire shorted to a supply feed or of a coil with shorted windings. No manufacturer documents this code publicly; J2012 reserves the codes for cylinders 9 to 12 for engines with more than eight cylinders. Engines that could in principle have a cylinder 9 with deactivation include the Mercedes M137 V12, the Lamborghini Aventador V12 and Bentley's W12; for none of them is a separate exhaust actuator documented, and the Bentley engine is described as leaving its valves working during shut-off. A US patent from GM shows that the exhaust side has a sequence of its own: there the exhaust valves stop before the intake valves and also return first. P3469 (open) and P3471 (low) complete the electrical set.
- What you may notice
- Check engine lamp on
- Cylinder deactivation switched off by the control module
- Likely causes
- PossibleExhaust actuator wire of cylinder 9 shorted to voltage
- PossibleShorted windings in the exhaust actuator
- RareFaulty engine control module output
- 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.