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YES THIS IS MOST COMMONLY A WIRING PROBLEM IN THE INJECTOR HARNESS,
Bulletin No.: 05-06-04-047C
Date: April 23, 2008
with 6.6L Duramax(TM) Diesel Engine (VIN 2 - RPO LLY)
This bulletin is being revised to add DTC P1294 to Subject Line and Condition Statement. Please discard Corporate Bulletin Number 05-06-04-047B (Section 06 - Engine/Propulsion System).
Some customers may comment on the Service Engine Soon light becoming illuminated along with a severe reduction in engine power (limp home mode). Upon investigation, the technician may find DTCs P0202 and P2149 or P0207 and P2146 or P1294.
The injector connector circuits on cylinders 2 and 7 are not fully supported near the connector and are more susceptible to terminal breakage from engine vibration.
If published diagnostics lead to an injector connector install the revised 90 degree connector and the harness support bracket from the service kit P/N 98017958 using the following repair procedures.
Repair Procedure for Left Bank Cylinder Number 2
Tighten the fuel injector harness bracket bolt to 10 N.m (89 lb in).
Tighten the glow plug harness connector nut to 2 N.m (18 lb in).
Repair Procedure for Right Bank Cylinder Number 7
Tighten the injector harness bracket bolts to 20 N.m (15 lb ft).
Tighten the fuel filter assembly bolts to 20 N.m (15 lb ft).