DPF Regeneration Odors

The Diesel Particulate Filter (DPF) on the 3.0L Duramax diesel engine (RPO LM2) and 6.6L Duramax diesel engine (RPO L5P) available on 2019-2022 Silverado 1500, Sierra 1500; 2020-2022 Silverado 2500/3500, Sierra 2500/3500 2021-2022 Tahoe, Suburban, Yukon and Escalade models captures diesel exhaust gas particulates. Over time, the DPF must be cleaned through a regeneration event that burns off the collected soot during normal vehicle operation.

During DPF regeneration, exhaust temperatures may exceed 1,184°F (640°C) due to the rapid catalytic combustion. (Fig. 10) Due to the high exhaust temperatures created by regeneration events, there may be an odor observed outside the vehicle or inside the passenger cabin.

 

Fig. 10

 

Some intermittent odors may be described as a strong rubber smell, which may be caused by the exhaust heating the frame wax to temperatures conducive to odor emission (approximately 170–200°F, or 76–93°C)., The strong rubber smell will be present only under the right conditions. Do not replace the exhaust or any components for this normal condition.

TIP: On new vehicles with low mileage, there also may be a distinct odor underhood during the initial regenerations of the DPF. The odor may be caused by trace amounts of solvents on the DPF from the manufacturing process and will dissipate over the first 1,000 miles (1,600 km).

Refer to Bulletin #22-NA-110 for more information.

 

– Thanks to Hassan Abdallah

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