P2171Exhaust Pressure Regulator Vent Solenoid Control Circuit High
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- How the car detects it
- P2171 means the module sees too much voltage on the control line of the exhaust pressure regulator vent solenoid, usually because the line touches battery voltage or the solenoid shorts internally. No manufacturer documents this exact code publicly. The closest evidence comes from its sibling: Jaguar Land Rover assigns P2170 to the solenoid of the active exhaust valve on its petrol models, so on those cars P2171 belongs to the same part with the opposite electrical fault. CARB requires output components like this to be checked for circuit faults whenever they can affect emissions or other monitors. Checking means measuring the control wire with the solenoid unplugged for foreign voltage and the coil for a too low resistance. The driver mostly notices a MIL and an exhaust sound that no longer switches.
- What you may notice
- Check engine lamp on
- Exhaust flap stays in one position
- Likely causes
- LikelyControl wire shorted to a battery-fed circuit
- PossibleSolenoid coil shorted internally
- RareOutput stage in the engine control module faulty
- 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: €50 – €700
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.