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DTC P1409

DTC P1409

Diagnostic Instructions


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

• Review Strategy Based Diagnosis for an overview of the diagnostic approach.

• Diagnostic Procedure Instructions provides an overview of each diagnostic category.


DTC Descriptors

DTC P1409 5A

Exhaust Gas Recirculation (EGR) Control Circuit Not Plausible

DTC P1409 5B

Exhaust Gas Recirculation (EGR) Control Circuit Malfunction

Circuit/System Description

The exhaust gas recirculation (EGR) valve is controlled by the engine control module (ECM) through the EGR solenoid. A reference voltage is transferred to the EGR valve's solenoid valve. The ECM controls the solenoid valve by grounding the control circuit.

Conditions for Running the DTC


• The engine is running.

• The DTCs run continuously when the above conditions are met.


Conditions for Setting the DTC

The ECM detects the EGR flow is not plausible.

Action Taken When the DTC Sets

DTC P1409 is a Type C DTC.

Conditions for Clearing the DTC

DTC P1409 is a Type C DTC.

Reference Information

Schematic Reference

Engine Controls Schematics

Connector End View Reference

Component Connector End Views

Electrical Information Reference


• Circuit Testing

• Connector Repairs

• Testing for Intermittent Conditions and Poor Connections

• Wiring Repairs


DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions

Scan Tool Reference

Control Module References

Circuit/System Verification


1. Ignition ON, observe the DTC information with a scan tool. Verify that no other DTCs are set.

2. If any other DTCs are set, refer to Control Module References

3. DTCs P0401 or P0402 should not set.

4. Command the Intake Air Flow Valve Position from 0-100% with a scan tool. The throttle plate should respond to the scan tool commands.

5. If the throttle body does not respond to the scan tool commands, refer to Throttle Body Assembly Replacement

6. Command the EGR Valve from 0-100% with a scan tool. The EGR valve should respond to the scan tool commands.

7. If the EGR valve does not respond to the scan tool commands, refer to DTC P0405 or P0406

8. 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, inspect for the following:

• Intake system/charge air hoses for leaks/restrictions

• Exhaust system/turbo charger for leaks/restrictions

• Air filter for restrictions

2. Engine running at idle, command the EGR valve ON with a scan tool. Verify that the scan tool MAF (Mass Air Flow) Sensor parameter is below 6 g/s

3. If the parameter is greater than the specified value, replace the Q14 Exhaust Gas Recirculation (EGR) Valve.

4. Command the EGR Valve OFF with a scan tool. Verify that the scan tool MAF Sensor parameter is greater than 12 g/s

5. If the parameter is less than the specified value, replace the Q14 Exhaust Gas Recirculation (EGR) Valve.


Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

Exhaust Gas Recirculation Valve Replacement