OBD-II code · Powertrain (generic)
P047F Exhaust Pressure Control Valve A Stuck Open
Exhaust pressure control valve A is mechanically stuck open — backpressure cannot be raised, exhaust brake and DPF regen support fail.
Is it safe to drive with P047F?
Usually safe to drive in the short term. Get it diagnosed when convenient, sooner if the car drives differently.
Common causes
- Most likelyCarbon buildup or broken return spring
- Less likelyCarbon or debris buildup preventing free movement
- Less likelyComponent wear with age - mechanical play
Repair at a glance
- Difficulty
- Medium
- DIY friendly
- Best left to a mechanic
- Typical labour
- 0.7–3.5 h
- Emissions test
- Likely to fail
- Parts involved
- Exhaust Pressure Regulator
Related codes
- P0475Exhaust Pressure Control Valve A
- P04A4Exhaust Pressure Control Valve B Stuck Open
- P047CExhaust Pressure Sensor B Circuit Low
- P047DExhaust Pressure Sensor B Circuit High
- P047EExhaust Pressure Sensor B Circuit Intermittent/Erratic
- P0480Cooling Fan 1 Control Circuit
- P0481Cooling Fan 2 Control Circuit
- P0482Cooling Fan 3 Control Circuit Malfunction
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.