P0458

DTC P0458 or P0459

DTC Descriptors
DTC P0444
- Evaporative Emission (EVAP) Purge Solenoid Control Circuit Open

DTC P0445
- Evaporative Emission (EVAP) Purge Solenoid Control Circuit Shorted

Diagnostic Fault Information

Perform the Diagnostic System Check - Vehicle Diagnostic System Check - Vehicle prior to using this diagnostic procedure.






Circuit/System Description

The evaporative emission (EVAP) canister purge valve is used to purge fuel vapor from the EVAP canister to the intake manifold. The EVAP canister purge valve is pulse width modulated (PWM). Ignition voltage is supplied directly to the EVAP canister purge valve. The engine control module (ECM) controls the solenoid by grounding the control circuit with a solid state device called a driver. The driver is equipped with a feedback circuit that is pulled-up to a voltage. The ECM can determine if the control circuit is open, shorted to ground, or shorted to a voltage by monitoring the feedback voltage.

Conditions for Running the DTC

* The ignition is ON or the engine is operating.
* The DTCs runs continuously once the above conditions are met.

Conditions for Setting the DTC

DTC P0444

The ECM detects the EVAP purge solenoid control circuit is open.

DTC P0445

The ECM detects the EVAP purge solenoid control circuit is shorted to ground or voltage.

Action Taken When the DTC Sets

DTC P0444 and P0445 are Type B DTCs.

Conditions for Clearing the DTC

DTC P0444 and P0445 are Type B DTCs.

Reference Information

Schematic Reference

Engine Controls Schematics Electrical Diagrams

Connector End View Reference
* Engine Control Module (ECM) Connector End Views Engine Control Module (ECM) Connector End Views
* Engine Controls Connector End Views Engine Controls Connector End Views

Electrical Information Reference
* Circuit Testing Circuit Testing
* Connector Repairs Connector Repairs
* Testing for Intermittent Conditions and Poor Connections Testing for Intermittent Conditions and Poor Connections
* Wiring Repairs Wiring Repairs

DTC Type Reference

Diagnostic Trouble Code (DTC) Type Definitions Diagnostic Trouble Code (DTC) Type Definitions

Scan Tool Reference
* Scan Tool Data List Scan Tool Data List
* Scan Tool Data Definitions Scan Tool Data Definitions
* Scan Tool Output Controls Scan Tool Output Controls

Circuit/System Verification

1. With a scan tool, command the EVAP purge solenoid ON. You should hear an audible click for about 3-5 seconds.
2. If the vehicle passes the Circuit/System Verification Test, then operate the vehicle within the conditions for running the DTC. You may also operate the vehicle within the conditions that are captured in the Freeze Frame/Failure Records Data List.

Circuit/System Testing

1. Ignition OFF, disconnect the harness connector of the EVAP purge solenoid.

Important: The test lamp is used to load the circuit and may not illuminate.


2. Connect a test lamp between the ignition 1 voltage circuit of the EVAP purge solenoid and the negative terminal of the battery.
3. Ignition ON, test for less than 0.1 volt between the ignition 1 voltage circuit of the EVAP purge solenoid and the positive terminal of the battery.

• If greater than 0.1 volt, repair the ignition 1 voltage circuit of the EVAP purge solenoid for a short to ground or an open/high resistance.

4. With the ignition OFF, connect a test lamp between the control circuit and the ignition 1 voltage circuit of the EVAP purge solenoid.
5. With the ignition ON, use a scan tool to command the EVAP purge solenoid ON. The test lamp should pulse ON and OFF for about 3-5 seconds.

• If the test lamp remains ON all the time, test for a short to ground on the control circuit. If circuit/connections test normal, replace the ECM.

• If the test lamp remains OFF all the time, test for a short to voltage or an open/high resistance on the control circuit. If circuit/connections test normal, replace the ECM.

6. If all circuits/connections test normal, test or replace the EVAP purge solenoid.

Component Testing

1. Measure for 24-28 ohms of resistance between the terminals of the EVAP purge solenoid.

• If the resistance is not within the specified range, replace the EVAP purge solenoid.

2. Test for infinite resistance between each terminal of the EVAP purge solenoid and the EVAP purge solenoid housing.

• If less than infinite resistance, replace the EVAP purge solenoid.

Repair Instructions

Important: Always perform the Diagnostic Repair Verification Diagnostic Repair Verification after completing the diagnostic procedure.


* Evaporative Emission (EVAP) Canister Purge Solenoid Valve Replacement Service and Repair
* Control Module References Control Module References for engine control module replacement, setup, and programming