What does it mean?
P1447 is a Powertrain (engine, transmission, fuel system) fault code. It indicates: Leak Detection Pump Control Circuit Malfunction .
Symptoms
- MIL on with the EVAP monitor stuck incomplete
- No pump sound after the engine is switched off, when the leak test would normally run
- Other EVAP codes appearing alongside, sometimes contradicting each other
- Fuel vapour smell only if a real leak also exists
- Drivability and fuel economy unchanged
Likely causes
- Broken, chafed or shorted control wire between the PCM and the pump
- Corroded or water filled connector at the pump, typically near the charcoal canister
- Internally failed pump motor drawing no current or excessive current
- Blown fuse in the pump supply circuit
- High resistance or open ground connection for the pump
- Rodent damage to the wiring under the vehicle
- PCM driver fault, considered only when the wiring and pump both test good
How to fix it
- Command the pump with a scan tool and check whether it runs at all
- Inspect the pump connector and harness for corrosion, water, rodent damage and road impact damage
- Verify supply voltage and a clean ground at the pump connector with the key on
- Measure the pump motor resistance; an open or very low reading indicates a failed motor
- Test the control wire for continuity to the PCM and for shorts to ground and to power
- Apply battery voltage briefly to the pump on the bench, using a fused lead, to confirm whether the motor runs
- Replace the pump or repair the harness fault, then clear the codes and complete an EVAP monitor drive cycle