Diesel Particulate Filter DTC P2459 - keywords 6.6L DPF DTC engine exhaust LMM regen regeneration SES tow towing
| Subject: | Diesel Particulate Filter DTC P2459 |
| Models: | 2007-2008 Chevrolet Express, Kodiak, Silverado |
| 2007-2008 GMC Savana, Sierra, Topkick |
| Equipped with the 6.6L diesel engine RPO code LMM |
This PI was superseded to update Recommendation/Instructions. Please discard PIP4220.
The following diagnosis might be helpful if the vehicle exhibits the symptom(s) described in this PI.
Condition/Concern:
A dealer may encounter a 2007 6.6 Duramax Diesel Engine setting DTC P2459 for Diesel Particulate Filter Regeneration Too Often. P2459 may occur more often on vehicles that tow heavy loads on a regular basis.
Recommendation/Instructions:
Complete the current SI diagnostics for any trouble code or symptom found. Completion of the P2459 diagnostic is imperative.
Air Charge Cooler leaks, Intake air box/air filter modifications, poor fuel quality, or any basic engine driveability concern that causes excessive smoke may induce a P2459 to set.
If diagnostics are inconclusive there has been a new calibration released for P2459.
Install the latest TIS2000 calibration for p2459 and evaluate repairs.
Note: Please review the DPF operation with the customer (found in the owner's manual SI document number 1819641).
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.
