Diagnostic Instructions

DTC Descriptors

DTC P0403: Exhaust Gas Recirculation (EGR) Solenoid Control Circuit

DTC P0403 01: Exhaust Gas Recirculation (EGR) Solenoid Control Circuit Short to Battery

DTC P0403 02: Exhaust Gas Recirculation (EGR) Solenoid Control Circuit Short to Ground

DTC P0403 04: Exhaust Gas Recirculation (EGR) Solenoid Control Circuit Open

DTC P0403 54: Exhaust Gas Recirculation (EGR) Solenoid Control Circuit Temperature High

DTC P0489: Exhaust Gas Recirculation (EGR) Solenoid Control Circuit Low Voltage

DTC P0490: Exhaust Gas Recirculation (EGR) Solenoid Control Circuit High Voltage

Circuit Description

Voltage is provided to the exhaust gas recirculation (EGR) valve by the ignition 1 voltage circuit through a fuse. Ground is provided to the EGR valve on the control circuit by a low side driver within the engine control module (ECM). The ECM monitors the voltage on the control circuit of the EGR valve to determine if a failure is present.

Conditions for Running the DTC

Conditions for Setting the DTC

P0403

The ECM detects an open, short to ground or voltage on the control circuit of the EGR valve.

P0403 01

The ECM detects a short to voltage on the control circuit of the EGR valve.

P0403 02

The ECM detects a short to ground on the control circuit of the EGR valve.

P0403 04

The ECM detects an open circuit on the control circuit of the EGR valve.

P0403 54

The ECM detects that the internal output driver is over temperature.

P0489

The ECM detects an open or short to ground on the control circuit of the EGR valve.

P0490

The ECM detects a short to voltage on the control circuit of the EGR valve.

Action Taken When the DTC Sets

DTCs P0403, P0489, and P0490 are Type B DTCs.

Conditions for Clearing the DTC

DTCs P0403, P0489, and P0490 are Type B DTCs.

Reference Information

Schematic Reference

Engine Controls Schematics

Connector End View Reference

Electrical Information Reference

DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions

Scan Tool Reference

Circuit/System Verification

1. Start the engine, observe the DTC information with a scan tool. DTCs P0403, P0489, or P0490 should not set.
2. Engine idling, command the EGR valve to 100 percent. The engine should run rough or stall.
3. 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 List.

Circuit/System Testing

1. Ignition OFF, disconnect the harness connector at the EGR valve solenoid.
2. Ignition ON, verify that a test lamp illuminates between the ignition voltage circuit terminal 2 and ground.

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

3. Connect a test lamp between the control circuit terminal 1 and the ignition circuit terminal 2.
4. Command the EGR valve solenoid between 5-95 percent with a scan tool. The test lamp should respond to the scan tool commands.

⇒	If the test lamp is always ON, test the control circuit for a short to ground. If the circuit/connections test normal, replace the ECM.

⇒	If the test lamp is always OFF, test the control circuit for a short to voltage or an open/high resistance. If the circuit/connections test normal, replace the ECM.

5. Test for 2.6-4.6 volts between the control circuit terminal 1 and ground.

⇒	If the voltage is not within the specified range, replace the ECM.

6. If all circuits/connections test normal, test or replace the EGR valve solenoid.

Component Testing

1. Ignition OFF, disconnect the harness connector at the EGR valve solenoid.
2. Measure for 13-18 ohms of resistance between the ignition voltage and control circuit terminals of the EGR valve solenoid.

⇒	If the resistance is not within the specified range, replace the EGR valve solenoid.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.