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P0458




DTC P0443, P0458, or P0459

Diagnostic Instructions

* Perform the Diagnostic System Check - Vehicle Diagnostic System Check - Vehicle prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis Strategy Based Diagnosis for an overview of the diagnostic approach.
* Diagnostic Procedure Instructions Diagnostic Procedure Instructions provides an overview of each diagnostic category.

DTC Descriptors
DTC P0443
- Evaporative Emission (EVAP) Purge Solenoid Valve Control Circuit

DTC P0458
- Evaporative Emission (EVAP) Purge Solenoid Valve Control Circuit Low Voltage

DTC P0459
- Evaporative Emission (EVAP) Purge Solenoid Valve Control Circuit High Voltage

Diagnostic Fault Information






Circuit/System Description

An ignition voltage is supplied to the evaporative emission (EVAP) canister purge solenoid valve. The engine control module (ECM) grounds the EVAP canister purge solenoid valve control circuit through an internal switch called a driver. The ECM monitors the status of the driver. The EVAP canister purge solenoid valve is pulse width modulated (PWM). A scan tool will display the amount of ON time as a percentage.

Conditions for Running the DTC

* The ignition is ON.
* System voltage is at least 11 V.
* The devices have to be in their commanded state.
* DTCs P0443, P0458 and P0459 run continuously when the above conditions are met.

Conditions for Setting the DTC

The ECM detects that the commanded state of the driver and the actual state of the control circuit do not match for a minimum of 5 s.

Action Taken When the DTC Sets

DTCs P0443, P0458 and P0459 are Type B DTCs.

Conditions for Clearing the DTC

DTCs P0443, P0458 and P0459 are Type B DTCs.

Reference Information
Schematic Reference

Engine Controls Schematics [1][2]Electrical Diagrams
Description and Operation

Evaporative Emission Control System Description Evaporative Emission Control System Description

Hybrid Modes of Operation Description Hybrid Modes of Operation Description
Connector End View Reference

Component Connector End Views Hybrid/EV Battery Pack X1 A4
Electrical Information Reference

* Circuit Testing Circuit Testing
* Troubleshooting with a Test Lamp Troubleshooting with a Test Lamp
* Testing for Intermittent Conditions and Poor Connections Testing for Intermittent Conditions and Poor Connections
* Wiring Repairs Wiring Repairs

DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions Powertrain Diagnostic Trouble Code (DTC) Type Definitions
Scan Tool Reference

Control Module References Control Module References for scan tool information

Circuit/System Verification

1. Service Mode active, command the EVAP purge solenoid valve to 50 % with a scan tool while monitor the it's parameter. It should display 50 %. You should also hear the solenoid clicking.
2. Operate the vehicle within the Conditions for Running the DTC to verify the DTC does not reset. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records data.

Circuit/System Testing

1. Ignition OFF, disconnect the harness connector at the Q12 evaporative emission purge solenoid valve.
2. Service Mode active, verify that a test lamp illuminates between the voltage supply circuit terminal 1 and ground.

• If the test lamp does not illuminate, test the voltage supply circuit for a short to ground or an open/high resistance. If the circuit tests normal and the voltage supply circuit fuse is not open, test all components connected to the voltage supply circuit and replace as necessary.

3. Connect a test lamp between the ignition voltage circuit terminal 1 and the control circuit terminal 2.
4. Command the EVAP canister purge solenoid valve to 50% with a scan tool. The test lamp should respond to the command.

• If the test lamp is always ON, test the control circuit for a short to ground. If the circuit tests normal, replace the K20 Engine Control Module.
• If the test lamp is always OFF, test the control circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the K20 Engine Control Module.

5. If all circuits test normal, test or replace the Q12 evaporative emission canister purge solenoid valve.

Repair Instructions

Perform the Diagnostic Repair Verification Verification Tests after completing the diagnostic procedure.

* Evaporative Emission Canister Purge Solenoid Valve Replacement Service and Repair
* Control Module References Control Module References for ECM replacement, setup, and programming

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