Code
P1441
GWM
P — Powertrain
- Consumption in the fuel vapor system (EVAP) for the Chevrolet car only | Fuel vapor discharge (EVAP) consumption only for Oldsmobile
AI status
Completed
Completed
100%
Causes
- Loose, damaged or missing fuel filler cap
- Stuck-open or leaking purge valve (canister purge solenoid)
- Faulty vent/vent control valve or stuck closed/open
- Cracked, disconnected or leaking EVAP hoses or fittings
- Saturated, clogged or damaged charcoal canister
- Leak in fuel tank or fuel system plumbing
Symptoms
- Malfunction Indicator Lamp (MIL) illuminated
- Failed emissions readiness or failed inspection for EVAP
- Occasional fuel smell near filler neck or charcoal canister
- Possible drivability issues if purge stuck open (rough idle)
- Reduced fuel economy (less common)
What to check
- Read stored freeze-frame and live data related to EVAP (purge command, purge flow, vent status, fuel tank pressure)
- Confirm exact manufacturer description and freeze-frame conditions (Chevrolet vs. Oldsmobile behavior)
- Visual inspection of fuel cap, filler neck and EVAP hoses for damage or loose connections
- Operate/command purge and vent solenoids with a scan tool and observe response
- Smoke test or pressure decay test of EVAP system to locate leaks
- Check operation and output of fuel tank pressure / EVAP pressure sensor
Signal parameters
- Purge command (ON/OFF and duty cycle) from PCM
- Purge flow or purge valve position (if available)
- Vent solenoid commanded state and vent position feedback (if available)
- Fuel Tank Pressure (FTP) or EVAP pressure sensor reading during key-on and while commanding purge
- EVAP leak detection pump status or test pressure (if equipped)
- Freeze-frame vehicle speed, engine load, RPM and conditions when code set
Diagnostic algorithm
- Retrieve DTC, freeze-frame data and any related EVAP codes. Note vehicle make/model differences per manufacturer documentation.
- Perform a careful visual inspection: check fuel cap condition and torque, filler neck, EVAP lines, canister and connectors.
- Verify basic controls with a scan tool: command purge valve ON/OFF and observe changes in FTP/EVAP pressure and purge flow. Command vent solenoid and observe open/closed behavior.
- If purge is commanded but flow is excessive or continuous, isolate purge circuit and bench-test the purge valve for leakage/sticking.
- Perform a smoke test or pressure decay test on the EVAP system to locate external leaks (filler neck, hoses, fittings, canister) and note leak size/location.
- Test the fuel tank pressure/EVAP sensor for correct range and response; compare readings to expected behavior during key-on and purge events.
- Inspect charcoal canister for saturation or internal damage; replace if contaminated or internally leaking.
- Repair or replace identified faulty components (cap, hoses, purge/vent solenoids, sensor). Repair wiring/connectors as needed.
- Clear codes and perform test drive or readiness drive cycle. Re-scan to confirm code does not return and EVAP readiness items complete.
Likely causes
- Loose or defective fuel cap
- Purge valve stuck open or controlling incorrectly
- Vent solenoid not sealing or not opening when commanded
- Small EVAP system leak (cracked hose or fitting)
- Faulty fuel tank pressure sensor or incorrect sensor readings
Fault status
Status
Evaporative Emission System — excessive or improper fuel vapor flow/discharge detected. The PCM has identified EVAP control or integrity outside expected parameters (purge/vent control, leaks, or sensor fault).
Repair difficulty: Medium
Diagnostic time: 1-3 hours
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