P0449 on 2004-2012 Chevrolet Colorado — Evaporative Emission System Vent Valve/Solenoid Circuit
1 vehicles · 1 makes · $120-$600 repair
Most Reported On
P0449 is an OBD-II diagnostic trouble code meaning “Evaporative Emission System Vent Valve/Solenoid Circuit.” This code indicates the PCM detected an electrical fault in the circuit for the EVAP vent valve (also called the vent solenoid). This valve controls airflow into the charcoal canister and is used to seal the EVAP system for leak testing. A circuit fault prevents proper EVAP operation and leak detection, which is an emissions concern. It typically only triggers the check engine light, with no noticeable driveability effect. This code is most commonly reported on 2004-2012 Chevrolet Colorado, with repair costs ranging from $120 to $600.
Common Causes
Typical Repair Cost
Based on 1 documented vehicle-specific issues. Actual cost depends on root cause and vehicle.
Diagnostic Tools
To diagnose P0449, you'll need an OBD-II scanner. Here are our recommendations at every price point.
ANCEL AD310 Classic OBD-II Scanner
by ANCEL
A simple, affordable code reader that reads and clears check engine codes. Great for quick diagnostics on any OBD-II vehicle (1996+).
- Read & clear engine codes
- View freeze frame data
- I/M readiness status
- No batteries or app needed
BlueDriver Pro Bluetooth Scanner
by BlueDriver
Bluetooth OBD-II scanner with a free companion app. Provides enhanced diagnostics, smog readiness, and repair reports sourced from a database of verified fixes.
- Enhanced diagnostics (ABS, SRS, transmission)
- Repair Reports with verified fixes
- Smog check readiness
- Free app (iOS & Android)
LAUNCH CRP123X OBD-II Scanner
by LAUNCH
A professional-grade handheld scanner that reads all four major systems (engine, transmission, ABS, SRS) with live data streaming and graphing.
- Engine, transmission, ABS, SRS diagnostics
- Live data stream & graphing
- AutoVIN for vehicle identification
- Free lifetime updates via Wi-Fi
Autel MaxiCOM MK808S Diagnostic Tool
by Autel
Shop-level diagnostic tablet with bi-directional control, active tests, and full system coverage. Ideal for serious DIYers and small shops.
- All-system diagnostics (25+ modules)
- Bi-directional control & active tests
- Oil reset, EPB, BMS, TPMS, injector coding
- 7-inch touchscreen with Android OS
As an Amazon Associate, we earn from qualifying purchases. Prices are approximate and may vary.
FAQ
What does P0449 mean?
P0449 stands for "Evaporative Emission System Vent Valve/Solenoid Circuit." This code indicates the PCM detected an electrical fault in the circuit for the EVAP vent valve (also called the vent solenoid). This valve controls airflow into the charcoal canister and is used to seal the EVAP system for leak testing. A circuit fault prevents proper EVAP operation and leak detection, which is an emissions concern. It typically only triggers the check engine light, with no noticeable driveability effect.
What are the most common causes of P0449?
The most common causes of P0449 are: Faulty EVAP vent valve/solenoid, Open or shorted wiring in the vent valve circuit, Corroded, loose, or disconnected connector, Debris or moisture in the vent valve, Poor ground or loss of power to the valve, Failing PCM (less common). The specific cause varies by vehicle.
How much does it cost to fix P0449?
Repair costs for P0449 range from $120 to $600, depending on the vehicle and root cause.
Which vehicles are affected by P0449?
Au7o has documented P0449 across 1 vehicle models from 1 manufacturers: Chevrolet.
Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.