Purge control valve with an internal short in its coil or a stuck mechanism; Chafed, pinched or damaged wiring to the purge valve shorting to ground or to a supply; Corroded, wet or damaged connector at the purge valve or control unit; Fuel or liquid contamination of the valve connector or harness from a damaged vapour line or overfilling; Fault in the engine control unit output driver; Aftermarket wiring modification or previous repair causing a short in the harness.

P0445

EVAP System Purge Control Valve A Circuit Shorted.

Generic
Powertrain
Generic code
Low severity

How this code is built

P: SystemPowertrain
0: Defined bySAE, the same on every car
4: AreaAuxiliary emission controls
45: FaultThe specific fault in that area

What it means

P0445 means the engine control unit has detected a short in the circuit that operates the evaporative emissions purge control valve (valve A). The control unit monitors the valve's driver circuit and saw a voltage or current that points to a short to ground or to power, rather than a normal open or closed signal. The fault is electrical, so it is not set by a fuel vapour leak.

Symptoms

Engine warning light on
Rough idle or occasional stalling if the valve is stuck open
Hard starting after refuelling
Slight hesitation or lean running after the engine starts
Fuel smell near the engine bay or fuel tank
Emissions test failure

Possible causes

Purge control valve with an internal short in its coil or a stuck mechanismlikely
Chafed, pinched or damaged wiring to the purge valve shorting to ground or to a supplylikely
Corroded, wet or damaged connector at the purge valve or control unitpossible
Fuel or liquid contamination of the valve connector or harness from a damaged vapour line or overfillingpossible
Fault in the engine control unit output driverrare
Aftermarket wiring modification or previous repair causing a short in the harnessrare

How to diagnose

Read the stored codes and freeze frame data, noting engine temperature, load and whether other EVAP or fuel trim codes are present
Visually inspect the purge valve, its connector and the harness along its route for chafing, heat damage, corrosion and signs of moisture
Check the valve is correctly fitted and that vapour hoses are not fuel soaked or damaged
Measure the purge valve coil resistance and compare it with the specification for that model and engine
Back-probe the connector with the ignition on to check for the correct supply voltage, and look for a short to ground or power on the control wire with the connector unplugged
Use a bidirectional scan function to command the valve on and off, listening and feeling for clicking and watching the driver signal
Check the wiring continuity and insulation between the valve and the control unit, referring to the wiring diagram for the vehicle
Clear the code and road test to see whether it returns, checking that the readiness monitors then complete

How to fix

Replace the purge control valve if the coil is shorted or the valve is faulty
Repair or replace the damaged section of wiring and secure it clear of sharp edges and heat
Clean or replace the corroded connector terminals and ensure the connector is sealed
Renew any fuel-contaminated harness or connector and correct the cause of the contamination
Have the control unit tested and repaired or replaced only after the wiring and valve are confirmed good, following the manufacturer's procedure

Can I keep driving?

Low severity

The car can normally be driven while you arrange a repair, as this fault is unlikely to cause damage. If it idles roughly, stalls or smells strongly of fuel, have it checked promptly.

Guide written by AI from the code's definition. Confirm with a diagnosis before replacing parts.