GM has issued a new service update for the GMC Terrain related to an icing issue for the crossover’s charge air cooler when driving in extremely cold weather.
The problem: certain units of the GMC Terrain may exhibit a condition wherein sludge or ice can accumulate in the Charge Air Cooler (CAC) or Closed Crankcase Ventilation (CCV) system while driving in extremely cold weather. Extremely cold weather is considered to be 0 degrees Fahrenheit and below.
The hazards: if ice or sludge accumulates in the vehicle CAC or CCV system while driving in cold weather, it may affect the engine, resulting in a reduction in engine performance, incorrect boost levels, or an oil leak. It may also trigger any number of Diagnostic Trouble Codes (DTCs).
The fix: in order to address this issue, GM is instructing technicians to install a TCV thermal wrap on the engine. If needed, the Engine Control Module (ECM) may need to be programmed as well. In addition, a new turbocharger wastegate regulator solenoid valve may need to be installed. GM technicians are instructed to remove the original turbocharger wastegate regulator solenoid valve, test, apply the new thermal wrap, and reprogram the ECM as needed, while also clearing any possible DTCs.
Affected components: vehicle CAC or CCV system.
Number of affected vehicles: it’s unknown at this time how many units of the GMC Terrain are affected by this GM service update.
Owners should: owners can contact GMC 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 and customer vehicles that return to the dealership.
GM Service Update number: N222372590
GMC U.S. Customer Service: 1-888-988-7267