P048EExhaust Pressure Control Valve A Position Sensor/Switch Circuit High
- 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
- An exhaust pressure control valve is an electrically driven flap in the exhaust with a position sensor or end-position switch, usually inside the actuator. Valve A is the first such flap; Bentley's V8 assigns A to bank 1 and B to bank 2. Documented uses are the flap behind the particulate filter of VW's and Audi's 2.0 TDI, which raises back pressure for the low-pressure EGR, and the sound flaps of Audi and Bentley. P048E means valve A's position signal is above its window – an open signal pulled up, or a short to positive. VW's 2.0 TDI third generation of 2015 sets it together with P048B, P0475, P0477 and P0478: the flap is welded into the pipe, so with electronic faults only the actuator is replaced – an electrostatic-sensitive part that must be scrapped if dropped.
- What you may notice
- Check engine light on
- Flap without function, exhaust sound changed
- VW/Audi TDI: EGR fault P0401 possible
- Likely causes
- LikelyActuator electronics (position sensor) faulty
- PossibleSignal or ground wire open
- PossibleConnector corroded
- RareSignal shorted to positive
- 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 – €600
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.