EVAP System Flow During Non-Purge
2005-2011 Cadillac STS 3.6L V6
Description
The PCM detected fuel vapor flow through the EVAP system when it should be sealed (non-purge condition). The PCM seals the system by commanding the Purge Solenoid OFF and the Vent Valve ON, then monitors fuel tank pressure for unexpected vacuum changes. A leaking purge solenoid valve is the most common cause.
Symptoms
- Check Engine Light
- Rough idle
- Fuel odor
- Decreased fuel efficiency
- Poor acceleration
- Difficulty starting when engine is hot
Common Causes
- Defective EVAP purge control solenoid (most common)
- Defective charcoal canister
- Leaking vacuum lines in EVAP system
- Loose or damaged gas cap
- Clogged EVAP canister
- Overfilling fuel tank (damages charcoal canister on GM vehicles)
Diagnostic Steps
- Test EVAP purge solenoid for leakage
- Inspect vacuum lines for cracks or disconnections
- Check gas cap seal
- Smoke test EVAP system
- Test charcoal canister for saturation
- Monitor fuel tank pressure sensor with scan tool
Repair Notes
Replace EVAP purge control solenoid first (most common fix). GM charcoal canisters are susceptible to damage from fuel tank overfilling. If canister is saturated, replace it.
Related Codes
Other Powertrain Codes
- P0001Fuel Volume Regulator Control Circuit/Open
- P0002Fuel Volume Regulator Control Circuit Range/Performance
- P0003Fuel Volume Regulator Control Circuit Low
- P0004Fuel Volume Regulator Control Circuit High
- P0010Intake Camshaft Position Actuator Circuit/Open Bank 1
- P0011Intake Camshaft Position Timing Over-Advanced Bank 1
- P0012Intake Camshaft Position Timing Over-Retarded Bank 1
- P0013Exhaust Camshaft Position Actuator Circuit/Open Bank 1
- P0014Exhaust Camshaft Position Timing Over-Advanced Bank 1
- P0015Exhaust Camshaft Position Timing Over-Retarded Bank 1
P1441 on Other Vehicles
Common Questions
What does code P1441 mean on a 2005-2011 Cadillac STS?
P1441 stands for "EVAP System Flow During Non-Purge". The PCM detected fuel vapor flow through the EVAP system when it should be sealed (non-purge condition). The PCM seals the system by commanding the Purge Solenoid OFF and the Vent Valve ON, then monitors fuel tank pressure for unexpected vacuum changes. A leaking purge solenoid valve is the most common cause.
What are the symptoms of P1441 on a Cadillac STS?
Common symptoms of P1441 include: Check Engine Light, Rough idle, Fuel odor, Decreased fuel efficiency, Poor acceleration, Difficulty starting when engine is hot.
What causes P1441 on a 2005-2011 Cadillac STS?
Common causes of P1441 include: Defective EVAP purge control solenoid (most common), Defective charcoal canister, Leaking vacuum lines in EVAP system, Loose or damaged gas cap, Clogged EVAP canister, Overfilling fuel tank (damages charcoal canister on GM vehicles).