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DTC P245A-P245D - LNP or LNQ

The exhaust gas recirculation (EGR) cooler bypass solenoid valve is controlled by the engine control module (ECM). At engine cold start, the EGR cooler bypass allows hot exhaust gas to heat the inlet air in the manifold. Once the engine operating temperature is reached, the ECM will close the EGR cooler bypass.

Ignition is on.

P245A 00

The ECM detects an open in the output circuit.

P245C 00

The ECM detects a short to ground at the output circuit.

P245D 00

The ECM detects a short to voltage at the output circuit.

DTCs P245A, P245C and P245D are Type C DTCs.

DTCs P245A, P245C and P245D are Type C DTCs.

Schematic Reference

Engine Controls Schematics

Connector End View Reference

Component Connector End Views

Description and Operation

Exhaust Gas Recirculation (EGR) System Description

Electrical Information Reference

DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions

Scan Tool Reference

Control Module References for scan tool information

Special Tools

EN 23738-A Mityvac

For equivalent regional tools, refer to Special Tools .

1. Disconnect the vacuum source from the Q47 Exhaust Gas Recirculation Cooler Bypass Solenoid Valve.
2. Connect the EN 23738-A Mityvac to the Q47 Exhaust Gas Recirculation Cooler Bypass Solenoid Valve vacuum supply hose. Engine running, verify the vacuum is greater than -50 kPa (-7.25 PSI).

⇒	If less than the specified range, inspect the vacuum supply hose and filter for a leak or restriction. If the supply hose is normal, replace the vacuum pump.

3. Connect the vacuum source to the Q47 Exhaust Gas Recirculation Cooler Bypass Solenoid Valve. Connect the EN 23738-A Mityvac to the vacuum port on the Q47 Exhaust Gas Recirculation Cooler Bypass Solenoid Valve. Engine running, command the EGR Cooler Bypass Valve OFF with a scan tool. Verify the vacuum is at 0 kPa (0 PSI).

⇒	If greater than the specified range, replace the Q47 Exhaust Gas Recirculation Cooler Bypass Solenoid Valve.

4. Command the EGR Cooler Bypass Valve ON with a scan tool. Verify the vacuum is greater than -50 kPa (-7.25 PSI).

⇒	If less than the specified range, replace the Q47 Exhaust Gas Recirculation Cooler Bypass Solenoid Valve.

5. If all other components test normal, test or replace the Q47 Exhaust Gas Recirculation Cooler Bypass Solenoid Valve.

1. Ignition OFF, disconnect the harness connector at the Q47 Exhaust Gas Recirculation Cooler Bypass Solenoid Valve.
2. Ignition ON, verify that a test lamp illuminates between the ignition circuit terminal 1 and ground.

⇒	If the test lamp does not illuminate, test the ignition circuit for a short to ground or an open/high resistance. If the circuit tests normal and the ignition circuit fuse is open, test or replace the Q47 Exhaust Gas Recirculation Cooler Bypass Solenoid Valve.

3. Command the EGR Cooler Bypass Valve OFF with a scan tool, verify that a test lamp illuminates weakly between the ignition circuit terminal 1 and the control circuit terminal 2.

⇒	If the test lamp illuminates, test the control circuit for a short to ground. If the circuit tests normal, replace the K20 Engine Control Module.

4. Command the EGR Cooler Bypass valve ON with a scan tool. Verify the test lamp corresponds to the commanded states of the scan tool.

⇒	If the test lamp is always off, test the control circuit for an open circuit or short to voltage. If the circuit tests normal, replace the K20 Engine Control Module.

5. If all circuits test normal, test or replace the Q47 Exhaust Gas Recirculation Cooler Bypass Solenoid Valve.

Static Test

1. Ignition OFF, disconnect the harness connector at the Q47 Exhaust Gas Recirculation Cooler Bypass Solenoid Valve.
2. Test for 25-35 Ω between the control terminal 1 and the ignition terminal 2 of the Q47 Exhaust Gas Recirculation Cooler Bypass Solenoid Valve.

⇒	If not within the specified range, replace the Q47 Exhaust Gas Recirculation Cooler Bypass Solenoid Valve.

3. Test for infinite resistance between each terminal and the Q47 Exhaust Gas Recirculation Cooler Bypass Solenoid Valve.

⇒	If not the specified value, replace the Q47 Exhaust Gas Recirculation Cooler Bypass Solenoid Valve.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.