P0445 Code – Meaning, Causes, Symptoms (& How to Fix it)

A guide of how to diagnose & repair issues causing the P0445 trouble code

P0445 Trouble Code

A P0445 Code appears in the engine control unit’s memory when it recognizes something wrong with the Purge control valve.

There are a few different reasons for the P0445 trouble code, which we will discuss here.

P0445 Definition

Evaporative Emission Control System – Purge Control Valve Circuit Shorted

What does the P0445 mean?

The P0445 code means that there is a shorted circuit in the EVAP systems purge control valve.

The EVAP purge control valve is regulating the fuel vapors between the engine and the fuel tank. It is often a two-pinned solenoid with just one 12v+ and one ground.

P0445 Symptoms

Most likely, the only symptom you will get from the P445 code is the Check Engine light. It can cause a slightly decreased fuel consumption and fuel smell if it is stuck open.

  • Check Engine Light On
  • Fuel Smell
  • Probably, a slight decline in fuel efficiency.
  • High pressure in the gas tank.

How serious is the P0445 Code?

Very Low – Your car engine will function just fine with the P0445 code stored.

The only things that could happen are that your fuel consumption gets lower and that it is a little bit bad for the environment – because the fuel vapors will get released into the air.

Causes of the P0445 Code

  • Faulty EVAP Purge control solenoid
  • Wirings to EVAP purge control solenoid
  • Fried ECU/ECM

What repairs can fix the P0445 code?

  • Replace the EVAP Purge control valve
  • Repair the wirings to the EVAP Purge control valve
  • Replace Engine control unit

Common Diagnostic mistakes

A common mistake is starting to look for leaks in the EVAP system, which could occur with the P0442 Code. The P0445 Code clearly says an electrical problem in the circuit to the EVAP purge control valve and not a leak in the EVAP system.

Recommended Tools for Diagnosis

How to diagnose the P0445 Code

  1. Ohm measure the EVAP Purge control valve with a multimeter between the two pins. If you get 0 ohms, the circuit is shorted, and you need to replace the valve.
  2. Remove the connector from the EVAP purge control valve. Connect a diagnostic tool that can perform test output. Activate the purge control valve output from the ECU and measure for 12v+ on one of the pins and Ground on the other. It can also be a fluctuating output, which is best seen with a test light.
  3. Remove the connector from the engine control unit and the valve. Measure both wires for any connection between each other or connected to the ground. If you find any of this, there is a wiring problem somewhere.
  4. Measure the 12v+ and ground output directly on the plugs to the ECU when activating it with a diagnostic tool. If nothing happens – replace the ECU. Make sure your diagnostic tool can do this function, though.

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