P047F code meaning
Exhaust Pressure Control Valve A Stuck Open
Powertrain system Generic code P04xx codes Check engine light
What P047F 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. P047F means valve A stays open although it is commanded to close, detected by the flap's position sensor or by missing back pressure. On VW's 2.0 TDI and Audi's A3 TDI of 2009–12 the code appears with P0477, P048A–P048C and P0401: water and road salt corrode the flap shaft so the flap sticks; improved parts were introduced. As the flap drives the low-pressure EGR there, EGR flow is then too low.
P047F at a glance
- Check engine lightYes, usually on
- Emissions testCan fail
- Limp modePossible
- Repair difficultyMedium
- Typical labor0.5 to 3 hours
- Clears after repairAfter a drive cycle
Symptoms of P047F
- Check engine light on
- EGR flow too low (P0401), higher NOx
- Exhaust brake or warm-up flap without effect, possibly louder exhaust
Common causes of P047F
- Most likelyFlap shaft corroded or seized
- PossibleSoot or carbon on the flap
- PossibleActuator or linkage faulty or unhooked
- Less likelyPosition sensor reports wrongly
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 P047F 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). |
| 7F | The exact fault in that area. |
What to do next
- Note P047F 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 P047F
What does P047F mean?
P047F means "Exhaust Pressure Control Valve A Stuck Open". 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 P047F?
Drive gently and only to a workshop. With P047F the car can go into limp mode (reduced power) to protect itself.
Will P047F fail an emissions test?
Yes, it can. P047F 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 P047F to fix?
Difficulty: medium. A typical repair takes 0.5 to 3 hours of work. This is a job for a workshop.
Will P047F 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.