P042E

P042E-EXHAUST GAS RECIRCULATION CONTROL STUCK OPEN



Theory of Operation

During regeneration of the after treatment Diesel Particulate Filter the Exhaust Gas Recirculation (EGR) valve is commanded to be in the closed position. If the EGR valve is not closed then a temperature rise will occur at the EGR valve orifice. The Engine Control Module (ECM) monitors the orifice temperature of the EGR valve and will set the fault if the temperature is above a calibrated threshold maximum value. The ECM will illuminate the MIL light immediately after the diagnostic runs and passes in four consecutive drive cycles.

- When Monitored:
This diagnostic runs when the vehicle speed is greater than 20 MPH and during a regeneration of the After treatment Diesel Particulate Filter.

- Set Condition:
The EGR outlet temperature is over a calibrated amount for 30 seconds.





Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. Pre-Diagnostic Troubleshooting Procedure.

1. OTHER EGR VALVE DTCS PRESENT
1. Ignition on, engine not running.
2. With the scan tool, read DTCs.

Are there any EGR circuit DTCs present?

Yes

- Repair the other EGR Valve DTCs before proceding.

No

- Remove and clean the EGR Valve with Mopar EGR system cleaner.
- Go To 2

2. EGR VALVE
1. Ignition on, engine not running.
2. With the scan tool, erase DTC.
3. Test drive the vehicle.
4. With the scan tool, read DTCs.

Did DTC P042E return?

Yes

- Replace the EGR Valve.
- Perform the POWERTRAIN VERIFICATION TEST - 6.7L. Powertrain Verification Test.

No

- Repair complete.
- Perform the POWERTRAIN VERIFICATION TEST - 6.7L. Powertrain Verification Test.