KieGuy

I bought my 07' 2500 with a 6.7 with 130k last November at a discounted price because it had a cracked DPF. I tracked a used one down that worked when pulled off the truck (only 45k on the truck now and it was pulled about a year ago) and bought it for $200 compared to a new one $3800 from the dealership. before I put the new DPF on I was getting two codes P2002 (diesel particulate filter efficency below threshold) and P0420 (Catalyst System Efficiency Below Threshold (Bank 1)), after I installed the DPF and had the codes cleared all was good for about a week and a half when after a short trip on the Interstate the P0420 came back. Any ideas where to start? Any help is much appreciated!

mega-engr

Catalyitic Converter. possible 02 sensors, EGR.

xcc_rider

This could help:

P0420-CATALYST EFFICIENCY BANK 1 For a complete wiring diagram Refer to Section 8W. Theory of Operation
The aftertreatment diesel oxidation catalyst is designed to react with hydrocarbons in the exhaust stream, this chem- ical reaction reduces hydrocarbon emission levels and also produces heat. Periodically. the ECM win utilize the heat generated by this reaction in the aftertreatment diesel oxidation catalyst to actively regenerate and clean the after- treatment diesel particulate filter. This diagnostic checks that the aftertreatment diesel oxidation catalyst is present and functioning correctly. The ECM monitors the efficiency of the aftertreatment diesel oxidation catalyst through interpretation of data received from. the aftertreatment diesel oxidation catalyst jnlet and diesel particulate filter inlet temperature sensors, the monitor checks for a temperature rise across the aftertreatment diesel oxidation catalyst. The ECM will set the fault if it detects that the aftertreatment diesel oxidation catalyst is not present in the after- treatment/exhaust system. The ECM will illuminate the MIL lamp immediately when the diagnostic runs and fails. The ECM will turn off the MIL lamp immediately after the diagnostic runs and passes.
• When Monitored:
This diagnostic runs when the engine is running, and performing an active regeneration of the aftertreatment particulate filter.
• Set Condition:
The ECM will set the fault if it detects that the aftertreatment diesel oxidation catalyst is not present in the aftertreatmentlexhaust system.
Possible Causes
AFTERTREATMENT DIESEL OXIDATION CATALYST HAS BEEN REMOVED FROM THE VEHICLE
AFTERTREATMENT DIESEL OXIDATION CATALYST IS DAMAGED OR NOT FUNCTIONING PROPERLY
AFTERTREATMENT DIESEL OXIDATION CATALYST INLET AND/OR OUTLET TEMPERATURE SENSORS ARE DAMAGED/FAILED
IMPROPER FUELING
WIRING HARNESS

Always perform the Pre-Diagnostic- Troubleshooting procedure before proceeding. (Refer to 9 .. ENGINE - DIAGNOSIS AND TESTING)
Diagnostic Test
1. OTHER DTC'S
Ignition on, engine not running. With the scan tool l read DTC's. Are any other DTC's Active?
Yes » R e p a ir other DTC's.
Perform POWERTRAIN VERIFICATION TEST - 6.7L. (Refer to 9 - ENGINE - STANDARD PROCE- DURE)
No »Go To 2
2. EXHAUST LEAK
Perform the no trouble code test *CHECKING THE EXHAUST SYSTEM FOR LEAKS.
Are leaks found?
Yes » R e p a ir or replace as necessary.
Perform POWERTRAIN VERIFICATION TEST - 6.7L. (Refer to 9 - ENGINE - STANDARD PROCE- DURE)
No »Go To 3
3. AFTERTREATMENT DIESEL OXIDATION CATALYST INLET AND/OR OUTLET TEMPERATURE SENSORS
Remove and inspect the aftertreatment diesel oxidation catalyst and temperature sensors for damage and presence.
Are the components found to be damaged or missing during the inspection of the aftertreatment diesel oxidation catalyst and temperature sensors?
Yes » R e p la c e or repair damaged component(s).
Perform POWERTRAIN VERIFICATION TEST -6.7L. (Refer to 9 -ENGINE -STANDARD PROCE· DURE)
No »Go To 4
4. EXHAUST GAS TEMPERATURE SENSOR #1 AND #2 ARE FUNCTIONAL.
For Manual Transmission Vehicle.
• 1. Run the engine at Idle for at least 10 to 12 minutes with the vehicle in PARK.
• 2. Check that Exhaust temperature sensor #1 and Exhaust temperature sensor #2 are within 1500 F -2000 F
of each other.
For Automatic Transmission Vehicle.
• 1. Run the engine at Idle for at least 10 to 12 minutes with the PARKING BRAKE ON.
• 2. Check that Exhaust temperature sensor #1 and Exhaust temperature sensor #2 are within 1500 F -2000 F of each other.
Is Exhaust temperature sensor #1 and Exhaust temperature sensor #2 are within 1500 F -2000 F of each other?
Yes »Go To 5
No » R e p la c e both exhaust temperature sensors.
Perform POWERTRAIN VERIFICATION TEST - 6.7L. (Refer to 9 - ENGINE - STANDARD PROCE- DURE)
5. AFTERTREATMENT DIESEL OXIDATION CATALYST IS DAMAGED OR NOT FUNCTIONING PROPERLY
Remove the exhaust plumbing from the turbocharger outlet.
Inspect for signs of oil, coolant or fuel being introduced into the aftertreatment system from the engine or signs of moisture in the turbocharger exhaust outlet.
Is contamination found in the turbocharger exhaust outlet?
Yes » Id e n tify and repair the source of the contamination within the engine and replace the aftertreatment die- sel oxidation catalyst after the engine failure has been repaired
Perform POWERTRAIN VERIFICATION TEST - 6.7L. (Refer to 9 - ENGINE - STANDARD PROCE- DURE)
No »Go To 6
6. AFTERTREATMENT DIESEL OXIDATION CATALYST
Is DTC P0420 Active?
Yes » R eplac e aftertreatment diesel oxidation catalyst then clear the DTC.
No »Refer to the INTERMITTENT CONDITION -DIESEL Symptom. (Refer to 9 -ENGINE -DIAGNOSIS AND TESTING)

KieGuy

Thanks guys that will give me a place to start.