DL8 - Remove Garage Forced Air

Diagnostic Trouble Code (DTC) 335 indicates the Pressure Feedback EGR (PFE) / Differential Pressure Feedback EGR (DPFE) sensor is out of Self-Test range.

Possible causes are:

- Damaged PFE/DPFE sensor.

- Obstructed pressure inlet hose(s).

- Garage exhaust ventilation system affecting PFE/DPFE sensor operation.

NOTE: PFE/DPFE system can sense a lack of pressure in the vehicle exhaust system. An efficient garage exhaust ventilation system that is installed during Key On Engine Off (KOEO) Test Mode may generate a DTC 335.

- Remove garage forced ventilation system and properly vent to atmosphere.

- Rerun KOEO Self-Test. Quick Test Appendix (Detailed Testing Instructions)

- Is DTC 335 present?

Yes -- Go to DL9. DL9 - Check PFE/DPFE Sensor Pressure Input Hose(s)

No -- ADDRESS other DTC's in KOEO Self-Test. If none. CONTINUE with remaining Quick Test. Quick Test Appendix (Detailed Testing Instructions)