What Does P2171 Mean?
The PCM has detected high voltage in the control circuit for the exhaust pressure regulator vent solenoid. This indicates an open circuit, poor connection, or driver circuit failure in the emissions control system.
Common Causes
35%
Open circuit in solenoid control wiring
25%
Disconnected or corroded solenoid connector
25%
Failed exhaust pressure regulator vent solenoid with open coil
10%
Faulty PCM driver circuit for solenoid
5%
Broken wire at PCM connector
Diagnostic Steps
1
Step 1: Inspect solenoid connector for proper connection, corrosion, and bent pins
2
Step 2: Check continuity of control circuit from PCM to solenoid connector
3
Step 3: Measure solenoid coil resistance with connector disconnected (typically 10-50 ohms)
4
Step 4: Verify ground circuit continuity and quality
5
Step 5: If all wiring and solenoid test good, test PCM driver output with oscilloscope
Estimated Repair Cost
$200 - $800
Parts + labor, varies by vehicle and location
The PCM has detected high voltage in the control circuit for the exhaust pressure regulator vent solenoid. This indicates an open circuit, poor connection, or driver circuit failure in the emissions control system.
The most common cause of P2171 (Exhaust Pressure Regulator Vent Solenoid Control Circuit High) is: Open circuit in solenoid control wiring
Typical repair costs for P2171 range from $200 to $800, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Safe to drive with reduced performance possible. Emissions may be elevated and check engine light will remain illuminated.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P2171 to identify the root cause.
OBDHut Mobile App
Scan codes directly from your car with the OBDHut app.
Coming Soon
Quick Info
Category
Powertrain
System
Emissions Control System
Difficulty
Type
Generic (SAE)
Recommended Tools
OBD2 Scanner
A quality scan tool helps you read codes, view live data, and clear faults.
