P0449 GMC Terrain
EVAP Vent Valve/Solenoid Circuit Malfunction · Powertrain Code · Low · Repair: Easy
What is P0449?
The EVAP vent valve or solenoid has an electrical malfunction.
When the GMC Terrain triggers code P0449 (evap vent valve/solenoid circuit malfunction), it typically points to an issue in the powertrain system. Below you'll find the most common causes, symptoms, and repair options specific to the GMC Terrain.
This repair is rated easy, meaning basic tools, no lift needed.
Diagnostic data on this page is compiled from publicly available repair resources and technical service bulletins. Always have a qualified mechanic confirm the diagnosis before authorizing repairs on your GMC Terrain.
Common Causes on GMC Terrain
- Failed EVAP vent solenoid (single most common GM DTC cause)
- Corroded vent solenoid electrical connector
- Open or short in vent solenoid control circuit wiring
- PCM driver fault for vent solenoid circuit (rare)
Symptoms
- Check Engine Light on
- No driveability symptoms
- May fail emissions inspection
- Occasional difficulty at the fuel pump when refueling
Notes for GMC Terrain
P0449 is the single most commonly searched DTC for GM trucks — the EVAP vent solenoid is a 15-minute, $25 repair that is the fix in over 90% of cases.