GM issues new service update for Buick Encore

INDIANA – GM has issued a new service update for the Buick Encore with regard to an icing issue in the engine charge air cooler while driving the crossover in extremely cold weather.

The problem is some units of the Buick Encore may accumulate sludge or ice in the engine Charge Air Cooler (CAC) or closed Crankcase Ventilation (CCV) system while driving in extremely cold weather. In this case, extremely cold weather is considered to be 0 degrees Fahrenheit and below.

If ice or sludge accumulates in the vehicle’s CAC or CCV system, it could affect the engine. Possible issues include a reduction in engine performance, incorrect boost levels, or an oil leak. This condition may also trigger a variety of different Diagnostic Trouble Codes (DTCs).

To fix this issue, GM advises that a GM technician install a TCV thermal wrap on the engine. If needed, the Engine Control Module (ECM) may also need to be reprogrammed, while a new turbocharger wastegate regulator solenoid valve may need to be installed as well. GM technicians are instructed to remove the original turbocharger wastegate regulator solenoid valve, test, and apply the new thermal wrap, then reprogram the ECM as needed, plus clear any possible DTCs that may have triggered.

The affected vehicles are 2013 through 2022 Buick Encore. Note that an identical service update was issued for the GMC Terrain and several Chevy models. It’s unknown at this time how many units of the Buick Encore are affected by this GM service update.

Owners can contact Buick directly with any concerns they may have using the contact information listed below. GM has stipulated that this service update applies to both dealer inventory, as well as any customer vehicles that may return to the dealership.


  • GM Service Update number: N222372590
  • Buick U.S. Customer Service: 1-800-521-7300

Information: GM Authority