GM has released a service update for the GMC Sierra related to an icing issue for the pickup’s charge air cooler. This issue may occur when driving in extremely cold weather.
The problem: certain units of the GMC Sierra 1500 may exhibit a condition wherein ice or sludge accumulates in the Charge Air Cooler (CAC) or closed Crankcase Ventilation (CCV) system when driving in extremely cold weather. In this case, extremely cold weather is considered to be 0 degrees Fahrenheit and below.
The hazards: if ice or sludge accumulates in the GMC Sierra 1500 CAC or CCV system, it could affect the engine. This problem may manifest as a reduction in engine performance, incorrect boost levels, or an oil leak. It may also trigger a number of different Diagnostic Trouble Codes (DTCs).
The fix: in order to address this issue, GM has instructed technicians to install a radiator air front lower baffle, and, if needed, reprogram the vehicle’s Engine Control Module (ECM) as well.
Affected components: turbocharged 2.7L I4 L3B gasoline engine CAC or CCV system.
Affected vehicles: 2019 through 2021 GMC Sierra 1500 models equipped with the turbocharged 2.7L I4 L3B gasoline engine.
Number of affected vehicles: it’s estimated that 66 vehicles may be affected by this issue. To note, those 66 vehicles also include units of the Chevy Silverado 1500.
Owners should: owners can contact GMC directly with any concerns they may have using the contact information listed below.
- GM Service Update number: N222372592
- GMC U.S. Customer Service: 1-888-988-7267
To note, GM previously issued a service update for a similar issue affecting units of the Buick Encore, GMC Terrain, and various Chevy models. Per previous GM Authority coverage, these vehicles may also see an accumulation of ice or sludge in the CAC or CCV when driving in extremely cold temperatures. Check out our previous coverage for more information.