P0475Exhaust Pressure Control Valve A
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- Needs a drive cycle to confirm a fix
- How the car detects it
- The exhaust pressure control valve is a flap in the exhaust: on older Navistar/Ford diesels a warm-up flap that raises back pressure when cold, on Ram and others an exhaust brake, on VW's 2.0 TDI a flap that drives the low-pressure EGR, and on Audi and Bentley a sound flap. P0475 is the general circuit fault of valve A, monitored like any output as CARB requires. VW's 2.0 TDI of 2015 sets it together with P0477/P0478, and the actuator electronics are replaced; Audi uses it for an electrical fault of the sound flap, Bentley for a shorted commutator in the flap motor. On the Navistar warm-up flap, a patent describes control to a target back pressure with the exhaust pressure sensor as feedback.
- What you may notice
- Check engine light on
- Flap without function: sound unchanged, rattling
- Diesel: longer warm-up, exhaust brake weak or EGR faults
- Likely causes
- LikelyFlap actuator (motor or electronics) faulty
- PossibleWire or connector at the exhaust damaged or corroded
- PossibleControl wire open
- RareDriver in the engine module
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Medium · Usually a job for a workshop.Typical cost: €150 – €900
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.