For 1990-2009 cars only
LB7/LLY 6.6L Duramax Diesel Engine Low Engine Power/Performance, Exhaust, Smoke, MIL/SES DTCs P0101,P0236, Engine Exhaust Brake Valve Sticks Open or Closed (Install Updated Engine Exhaust Brake Valve)
| Subject: | LB7, LLY 6.6L Duramax® Diesel Engine -- Low Engine Power/Performance, Poor Acceleration, Exhaust Smoke/Hissing Noise, MIL/SES On, DTCs P0101, P0236 (Install Updated Engine Exhaust Brake Valve) |
| Models: | 2003-2005 Chevrolet Kodiak C4500-C5500 Series |
| 2003-2005 GMC TopKick C4500-C5500 Series |
| with 6.6L Duramax® Diesel Engine (VINs 1, 2 -- RPOs LB7, LLY) and Exhaust Engine Brake (RPO K40) and/or Exhaust Restrictor Equipment (RPO NPE) |
Condition
Some customers may comment on low engine power/performance or an MIL/SES light on. Any of the following conditions may also be noted:
| • | Poor Acceleration |
| • | DTC P0101- Mass Air Flow (MAF) Sensor Performance |
| • | DTC P0236-Boost Pressure Sensor Signal is below predicted range |
| • | Exhaust Brake always on |
| • | Excessive exhaust smoke |
| • | Exhaust hissing noise |
| • | Exhaust Brake inoperative |
Cause
The engine exhaust brake valve shaft may corrode, causing the valve to stick open or close.
Correction
Install an updated engine exhaust brake valve. Refer to Engine Brake Replacement in SI.
Parts Information
Part Number | Description | Engine | RPO |
|---|---|---|---|
15287855 | Valve, Exhaust Brake | LLY | K40 |
15287856 | Valve, Exhaust Brake | LB7 | K40/NPE |
15051538* | Gasket, Exhaust | *P/N used on LLY and LB7 applications. Quantity of 2 gaskets needed for repair. | |
Warranty Information
For vehicles repaired under warranty, use:
Labor Operation | Description | Labor Time |
|---|---|---|
J5393 | Valve Assembly, (Engine Exhaust Brake System) - Replace | Use Published Labor Operation Time |
