P0445🌫 Emissions / evaporative emission (EVAP) systemDrive with caution, fix soon

P0445: EVAP Purge Control Valve Circuit Shorted (Meaning, Causes, Fixes)

Reviewed 2026-10-23 · Based on 2 cited source(s)

What P0445 means

The evaporative emission (EVAP) system captures fuel vapors from the tank and later lets the engine draw them in and burn them through the purge valve, which the engine computer (PCM/ECM) controls. OBD-Codes.com explains that the purge valve is usually powered by the battery and switched on and off with a duty cycle by the computer, and that P0445 sets when the computer monitors the voltage to the purge control valve and sees a lower voltage than expected, which points to a short (for example a short to ground). RepairPal defines P0445 as improper purge flow in the EVAP system caused by a shorted purge valve, but its summary says the computer sets the code when the EVAP system has flow when it should not, and its technician notes say the code can be misleading because what it really reflects is the purge function not creating the specified vacuum during the EVAP leak test, measured by the fuel tank pressure sensor. So the sources differ: OBD-Codes.com treats P0445 as a purely electrical short, while RepairPal also lists a purge valve physically stuck open or closed, and its notes bring in EVAP leaks and the fuel tank pressure sensor. Related codes are P0443 (purge control valve circuit) and P0444 (circuit open).

Severity: can I keep driving?

Drive with caution, fix soon

Get it diagnosed within a reasonable time. RepairPal rates P0445 Moderate, meaning it may not threaten safety or drivability right away. OBD-Codes.com says it should not affect engine performance beyond slightly lower fuel economy, while RepairPal says that in some cases the engine may idle rough, hesitate or stall. It can also cause a failed emissions inspection. If you smell raw fuel, find the source before driving: fuel vapor near a hot engine or exhaust is a fire risk.

Common symptoms

Likely causes

Roughly most to least common, based on the sources below. Your vehicle may differ.

  1. Short circuit in the engine wiring harness or connector, such as pinched wires, bent pins or bare wiring (OBD-Codes.com)
  2. Purge control solenoid shorted inside (OBD-Codes.com; RepairPal lists an electrically shorted purge valve solenoid)
  3. Purge valve physically stuck open or closed (RepairPal only; OBD-Codes.com describes P0445 as an electrical fault)
  4. Faulty engine computer (PCM/ECM) (OBD-Codes.com)

Diagnostic steps you can do

⚠ Before you start

Work on a cool engine, parked on level ground with the parking brake set. Never work under a car supported only by a jack.

  1. Read all stored codes and note any other EVAP codes, since they change what to look at.
  2. Find the purge solenoid (usually in the engine bay on a vacuum line to the intake) and inspect its connector and wiring for damage, pinched wires, loose or bent pins, or bare wire with no insulation (OBD-Codes.com).
  3. With a multimeter, check for battery voltage at the power side of the solenoid connector with the key on and engine off, using the wiring diagram for your vehicle (OBD-Codes.com).
  4. Unplug the solenoid and measure resistance across its pins against the maker's specification, then from each pin to a good ground: the reading to ground should be very high or over limit (OL), and a very low reading means the solenoid is shorted and should be replaced (OBD-Codes.com).
  5. Don't just buy a gas cap or a purge valve: RepairPal lists the fuel cap, the purge valve and the vent valve as common misdiagnoses for this code.

Typical fixes

Repair costs vary widely by vehicle, region, parts brand and shop, so we don't quote prices. Get a written estimate after diagnosis.

🛠 When to call a pro

  • Checking the power and control wires for a short to ground means unplugging the harness at the solenoid and at the engine computer and identifying the right pins from the wiring diagram (OBD-Codes.com)
  • Checking the computer's output needs an advanced scan tool to command or road-test the EVAP system, plus a graphing multimeter or oscilloscope to see the duty cycle at the computer connector (OBD-Codes.com)
  • RepairPal's technician notes say the code can reflect the EVAP leak test, so a stuck valve, a leak or a bad fuel tank pressure sensor may need a shop's EVAP test to sort out
  • You smell raw fuel, or the engine stalls or runs badly

Where to buy

Plain search links. Always match parts to your exact year, make, model and engine.

OBD2 scanners on Amazon Parts at Advance Auto Parts catalog at RockAuto

FAQs

Is P0445 serious?

RepairPal rates it Moderate. OBD-Codes.com says it shouldn't affect performance beyond slightly lower fuel economy, while RepairPal says it can occasionally cause a rough idle, hesitation or stalling. It can fail an emissions test, so get it diagnosed within a reasonable time.

Does P0445 mean I need a new purge valve?

Often the purge solenoid is the cause, but OBD-Codes.com also lists wiring and connector shorts, and RepairPal names replacing the purge valve as a common misdiagnosis. Check the wiring and test the solenoid for a short before buying parts.

What's the difference between P0443, P0444 and P0445?

All three are purge control valve circuit codes. P0443 is a general circuit fault, P0444 is an open circuit, and P0445 is a shorted circuit, per the code titles on OBD-Codes.com and RepairPal.

How much does it cost to fix P0445?

Neither source gives a repair cost. It can range from repairing a damaged wire to replacing the purge solenoid, or rarely the engine computer, so get a diagnosis and a written estimate first.

Sources

  1. OBD-Codes.com: P0445 Evaporative Emission Control System Purge Control Valve Circuit Shorted (Dan Weller, ASE Certified Master Technician)
  2. RepairPal: P0445 Evaporative Emission System Purge Control Valve Circuit Shorted (rated Moderate)

Last reviewed 2026-10-23. Code definitions and repair steps can vary by manufacturer. Confirm with your vehicle's service information.