What Does P2170 Mean?
The PCM has detected low voltage in the control circuit for the exhaust pressure regulator vent solenoid. This solenoid is part of diesel exhaust systems and helps regulate backpressure for emissions control.
Common Causes
35%
Short to ground in solenoid control circuit wiring
30%
Failed exhaust pressure regulator vent solenoid with internal short
20%
Corroded or damaged connector at solenoid or PCM
10%
Faulty PCM solenoid driver circuit
5%
Damaged pins or poor connection at PCM connector
Diagnostic Steps
1
Step 1: Inspect wiring harness from PCM to exhaust pressure regulator solenoid for damage or shorts
2
Step 2: Disconnect solenoid connector and measure resistance of solenoid coil (typically 10-50 ohms)
3
Step 3: Check for short to ground on control circuit with solenoid disconnected
4
Step 4: Test voltage supply to solenoid with key on (should have battery voltage)
5
Step 5: Command solenoid on/off with scan tool and monitor operation
Estimated Repair Cost
$200 - $800
Parts + labor, varies by vehicle and location
The PCM has detected low voltage in the control circuit for the exhaust pressure regulator vent solenoid. This solenoid is part of diesel exhaust systems and helps regulate backpressure for emissions control.
The most common cause of P2170 (Exhaust Pressure Regulator Vent Solenoid Control Circuit Low) is: Short to ground in solenoid control circuit wiring
Typical repair costs for P2170 range from $200 to $800, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Vehicle is safe to drive but may experience reduced power and increased emissions. Check engine light will remain on and emissions testing may fail.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P2170 to identify the root cause.
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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.
