P3474Cylinder 10 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
- P3474 is about function rather than wiring: cylinder 10 should shut down or come back, but measured engine behaviour says it did not, while its control circuit is intact. No manufacturer documents this code publicly; J2012 reserves the codes for cylinders 9 to 12 for engines with more than eight cylinders. Audi's R8 V10, one of the few ten-cylinder engines with shut-off, works without valve switching; Audi reserves the valve-closing method with zero-lift cams on axially sliding sleeves for its 4.0 TFSI V8. Where valve deactivation is used, causes lie in the oil supply or in a sticking switching element, and NHTSA's description of GM's lifters with oil-pressure locking pins shows how small leaks spoil the switch. P3473, P3475 and P3476 are the electrical codes of cylinder 10.
- What you may notice
- Check engine lamp on
- Misfire on cylinder 10 (P0310)
- Tapping noise from the valve train
- Likely causes
- LikelyOil pressure or oil condition not sufficient to switch cylinder 10
- PossibleLifter or cam sleeve at cylinder 10 sticking
- PossibleOil screen or passage to the cylinder 10 actuator blocked
- RareLeaking seal at the actuator
- 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.