P0475 code meaning
Exhaust Pressure Control Valve A
Powertrain system Generic code P04xx codes Check engine light
What P0475 means
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.
P0475 at a glance
- Check engine lightYes, usually on
- Emissions testCan fail
- Limp modePossible
- Repair difficultyMedium
- Typical labor0.5 to 2.5 hours
- Clears after repairAfter a drive cycle
Symptoms of P0475
- Check engine light on
- Flap without function: sound unchanged, rattling
- Diesel: longer warm-up, exhaust brake weak or EGR faults
Common causes of P0475
- Most likelyFlap actuator (motor or electronics) faulty
- PossibleWire or connector at the exhaust damaged or corroded
- PossibleControl wire open
- Less likelyDriver in the engine module
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Exhaust pressure control valve aValve actuatorActuator wiringEngine control module
What each part of P0475 means
| P | Powertrain system: engine, fuel system, ignition, emissions and transmission. |
| 0 | Generic code: it means the same on every make (SAE standard). |
| 4 | Area: auxiliary emission controls (catalytic converter, EGR, EVAP). |
| 75 | The exact fault in that area. |
What to do next
- Note P0475 and any other codes stored with it: several codes together often point to one cause.
- Check for loose connectors and damaged wiring around the parts the code names.
- Check open recalls for your car: some faults are fixed for free by the dealer. Enter your VIN.
- Clear the code only after the repair. If it comes back, the fault is still there.
Buying a used car? Scan it for stored codes before you pay. A recently cleared memory can hide a problem.
Questions about P0475
What does P0475 mean?
P0475 means "Exhaust Pressure Control Valve A". 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. It is a generic code, so it means the same on every make.
Is it safe to drive with P0475?
Drive gently and only to a workshop. With P0475 the car can go into limp mode (reduced power) to protect itself.
Will P0475 fail an emissions test?
Yes, it can. P0475 is emissions-related, so most inspection programs fail a car while it is stored or while the check engine light is on.
How hard is P0475 to fix?
Difficulty: medium. A typical repair takes 0.5 to 2.5 hours of work. This is a job for a workshop.
Will P0475 clear itself after the repair?
After the repair the car has to complete a drive cycle (a mix of city and highway driving) before the test runs again. Until then the readiness monitor shows "not ready", which can fail an inspection.