Preparing Your Duramax for Winter Cold

As we are approaching winter, I thought it would be good to review some cold-climate issues that can arise with the Duramax:

2007–2009 GMC Sierra/Chevrolet Silverado with LMM Duramax Engine: P0101 MAF Sensor Performance or P0106 MAP Sensor Performance, Reduced Engine Power Mode, caused by snow ingestion into the air filter assembly.

This problem’s primary solution is reviewed in Bulletin #08-06-04-054. In cold climates, snow can accumulate in the filter, cause a restriction; or, it can melt and cause the MAF sensor to be contaminated with moisture. To combat this issue, we are instructed to drill holes in the air cleaner cover and to run the grille portion of the Winter front that is provided with the truck. The holes should be drilled as indicated in the following photo:

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Joel Paynton is an award-winning GM technician who specializes in Duramax fuel systems. He also does custom programming for any GM powertrain. Visit him on the web at


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