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:

Selective Catalyst Reduction: Cold Climate Urea Fluid Issues

I have heard that there are cold-climate problems with urea fluid that is coming with the new Duramax. What can we expect? Is it practical to by a new 2010 Duramax in cold-climates? Or does this spell the end of diesel trucks in the North?

Using Block Heater Sets Engine Light in 2005 Duramax Diesel

When I plug in the block heater of my 2005 Duramax, the engine light comes on shortly after I start the engine. The problem does not occur when the truck is not plugged in. What is going on?

Aluminum Wheel Salt Corrosion and Clearcoat Restoration

An issue that you could cover, especially for us salt belt folks, is the corrosion of the alloy wheels. I have corrosion getting under the clear coat on the aluminum. GM has a service bulletin on how to refinish these: it involves having the clear coat stripped, repolishing and re-clearcoating the aluminum.

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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