OBD-II code · Powertrain (generic, extended)
P2171 Exhaust Pressure Regulator Vent Solenoid Control Circuit High
EPR vent solenoid drive line stuck high — short to B+. Wiring faults of this kind typically come from chafing, water ingress at connector seals, or pin push-back — a wiggle test on the harness while the code is active often confirms the location.
Is it safe to drive with P2171?
Usually safe to drive in the short term. Get it diagnosed when convenient, sooner if the car drives differently.
Common causes
- Most likelyShort to B+
- Less likelyConnector pins corroded - high contact resistance
- Less likelySupply wire pinched against B+ source
Repair at a glance
- Difficulty
- Medium
- DIY friendly
- Best left to a mechanic
- Typical labour
- 0.7–2.5 h
- Emissions test
- Likely to fail
- Parts involved
- Exhaust Pressure Regulator
Related codes
- P2169Exhaust Pressure Regulator Vent Solenoid Control Circuit/Open
- P216EFuel Injector Group F Supply Voltage Circuit Low
- P216FFuel Injector Group F Supply Voltage Circuit High
- P2170Exhaust Pressure Regulator Vent Solenoid Control Circuit Low
- P2172Throttle Actuator Control System - Sudden High Air Flow Detected
- P2173High Airflow/Vacuum Leak Detected (Slow Accumulation)
- P2174Throttle Actuator Control System - Sudden Low Air Flow Detected
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.