26 07 04
May 14, 2007
MIL is ON and/or Catalytic converter is Rattling
MIL is ON, DTC P0422 is stored and/or Catalytic converter rattling.
The expansion mat in the original part can erode prematurely, causing the converter to rattle and/or MIL ON.
A new part was designed to fix this concern.
Repair identified after production was completed.
The above condition MAY be covered by the Catalytic converter Limited Extended Warranty, see Warranty Policies and Procedure Manual.
Prior to replacing a Catalytic converter under the Catalytic Converter Limited Extended Warranty, perform the following procedure:
Adjusting oil level is NOT covered by Warranty.
The DTC codes present will need to be erased before the test will run in MVB 46.
Is DTC P0422 (Main Catalyst Efficiency Below Threshold, Bank 1) Stored?
If Catalytic converter is NOT rattling and:
DTC P0422 and any DTC(s) from Table are stored:
If Catalytic converter is rattling and:
Any DTC(s) from table stored:
P0422 is the only DTC stored:
P0422 is the only DTC stored.
No DTCs are stored:
DTCs in table are stored:
The reason for DTC(s) from Table MUST be corrected (possibly at customer expense) prior to potential Catalytic converter replacement.
With other DTC(s) corrected:
If Catalytic converter is rattling:
If Catalytic converter is NOT rattling:
If complete readiness code cannot be set due to the catalyst diagnosis monitor in display group 46 not resetting:
If complete readiness code can be fully set:
If vehicle was returned to the Customer (without converter replacement) and Customer returns with DTC P0422 stored again:
Catalytic converter Limited Extended Warranty:
Required Parts and Tools
When replacing any catalyst, your VIN may be required to ensure the correct part is ordered (check with your Parts Dept.).
If Catalytic converter is on parts submission:
Claims for s (which are on submission) that are shipped to the Warranty Test Center without print-outs (including freeze frame data) may be denied.
All part and service references provided in this Technical Bulletin are subject to change and/or removal.
Always check with your Parts Dept. and Repair Manuals for the latest information.