Duramax Diesels With SES Light And DTC P0402 - keywords 6.6 air diesel egr engine excessive exhaust flow gas gasket intake leak LMM low MAF noise power recirulation rough valve
| Subject: | Duramax Diesels with SES Light and DTC P0402 |
| Models: | 2007 Chevrolet Express, Kodiak, Silverado |
| 2007 GMC Savana, Sierra, Topkick |
| Equipped with the 6.6L Duramax Diesel engine RPO code LMM |
This PI was superseded to update Recommendation/Instructions. Please discard PIP4147.
The following diagnosis might be helpful if the vehicle exhibits the symptom(s) described in this PI.
Condition/Concern:
The customer concern may be SES light on, a loss of power, and DTC P0402
Recommendation/Instructions:
Complete the current SI diagnostics for any trouble code or symptom found. If the diagnostic is inconclusive, or the diagnostic has not led to a repair, please do not replace any EGR components.
SI diagnostics should still be completed for P0402 because it's still possible to have an air intake duct leak or a Charge Air Cooler leak inducing the trouble code.
If diagnostics are inconclusive, engineering is in process of developing a new calibration for repairs.
This PI will be updated when more information becomes available.
Please follow this diagnostic or repair process thoroughly and complete each step. If the condition exhibited is resolved without completing every step, the remaining steps do not need to be performed.
