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Service bulletins for the 2018 GMC Terrain

A bulletin is a manufacturer's communication to its dealers, as NHTSA indexes it. The summary is NHTSA's. The document is the manufacturer's: read it at NHTSA. A bulletin is not a recall, and listing a model year does not mean every vehicle of it is concerned.

1345 on file from NHTSA, as of 2026-10-19.

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Only bulletins with component: Heating and air conditioning are shown. Show all

Bulletins, newest first
18-NA-1622024-02-02. Service bulletin. EQUIPMENT; VISIBILITY:DEFROSTER/DEFOGGER/HVAC SYSTEM. This technical bulletin provides a procedure for air conditioning refrigerant desiccant replacement due to A/C Not Cooling or refrigerant loss.
PIT5099G2023-12-26. Service bulletin. VISIBILITY:DEFROSTER/DEFOGGER/HVAC SYSTEM. This Preliminary Information communication provides information to the technician about vehicles that the Heater-Vent-Air Conditioning blows warm air. Before calling General Motors Technical Assistance Center technician will need to have high and low pressures, outside temperature, humidity, and vent temperature.
PIP5540J2023-01-30. Service bulletin. VISIBILITY:DEFROSTER/DEFOGGER/HVAC SYSTEM:REAR WINDOW:ELECTRICAL HEATING ELEMENT. This Preliminary information communicates to the technician the need to inspect the induction system for potential icing issues in very cold ambient temperatures. To allow the ice to melt so that it can be drained from the related components. That any of the listed DTC's may set with or without poor engine performance.
PIT5099F2022-07-25. Service bulletin. VISIBILITY:DEFROSTER/DEFOGGER/HVAC SYSTEM. This Preliminary Information communication provides information to the technician about vehicles that the Heater-Vent-Air Conditioning blows warm air. Before calling General Motors Technical Assistance Center technician will need to have high and low pressures, outside temperature, humidity, and vent temperature.
12-01-37-001F2022-07-12. Service bulletin. EQUIPMENT; ENGINE AND ENGINE COOLING; VISIBILITY:DEFROSTER/DEFOGGER/HVAC SYSTEM. This service bulletin provides information to dealership personnel on a new refrigerant (R1234yf) for A/C service.
18NA0202021-05-03. Service bulletin. VISIBILITY:DEFROSTER/DEFOGGER/HVAC SYSTEM:AIR HANDLER/CHAMBER, DUCTS, AND VALVES. This technical bulletin provides a procedure to replace the charge air cooler due to moisture getting inside of it and causing a malfunction indicator lamp illuminated with DTC P0300 and/or P0299/P2227.
18NA1622020-09-28. Service bulletin. EQUIPMENT:APPLIANCE:AIR CONDITIONER. This technical bulletin provides a procedure for air conditioning refrigerant desiccant replacement due to A/C Not Cooling or refrigerant loss.
PIT5099E2020-08-10. Service bulletin. VISIBILITY:DEFROSTER/DEFOGGER/HVAC SYSTEM. This Preliminary Information communication provides information to the technician about vehicles that the Heater-Vent-Air Conditioning blows warm air. Before calling General Motors Technical Assistance Center technician will need to have high and low pressures, outside temperature, humidity, and vent temperature.
18NA1622019-10-28. Service bulletin. EQUIPMENT:APPLIANCE:AIR CONDITIONER. This technical bulletin provides a procedure for air conditioning refrigerant desiccant replacement due to A/C Not Cooling or refrigerant loss.
19NA0062019-07-29. Service bulletin. EQUIPMENT:APPLIANCE:AIR CONDITIONER. This technical bulletin provides a procedure to replace the HVAC case with the redesigned part.
18NA1622019-03-25. Service bulletin. EQUIPMENT:APPLIANCE:AIR CONDITIONER. This technical bulletin provides a procedure air conditioning refrigerant desiccant replacement due to refrigerant loss.
18NA0202019-03-25. Service bulletin. EQUIPMENT:APPLIANCE:AIR CONDITIONER. This technical bulletin provides a procedure to replace the charge air cooler due to moisture getting inside of it and causing a malfunction indicator lamp illuminated with DTC P0300 and/or P0299/P2227.
PIT5099D2018-11-13. Service bulletin. EQUIPMENT:APPLIANCE:AIR CONDITIONER. This Preliminary Information communication provides information to the technician about vehicles that the Heater-Vent-Air Conditioning blows warm air. Before calling General Motors Technical Assistance Center technician will need to have high and low pressures, outside temperature, humidity, and vent temperature.
PIT5099C2018-08-06. Service bulletin. EQUIPMENT:APPLIANCE:AIR CONDITIONER. This Preliminary Information communication provides information to the technician about vehicles that the Heater-Vent-Air Conditioning blows warm air. Before calling General Motors Technical Assistance Center technician will need to have high and low pressures, outside temperature, humidity, and vent temperature.
PIT5613A2018-08-06. Service bulletin. EQUIPMENT:APPLIANCE:AIR CONDITIONER; EQUIPMENT:ELECTRICAL. This Preliminary information communicates information to the technician about the HVAC pop-up on the radio display may show 61 degrees but the display on the HVAC knobs will show correct temp. Only the radio pop-up is showing the incorrect information. Technicians should not make any repairs. Dealer should communicate to the customer that we apologize for this inconvenience and that General Motors is working on a soulution.This PI will be replaced with a bulletin once repair information is available.
17NA3882018-06-04. Service bulletin. ELECTRICAL SYSTEM; EQUIPMENT:APPLIANCE:AIR CONDITIONER. This technical bulletin provides a procedure to reprogram the HVAC control module to correct a condition of HVAC Inoperative During Remote Start Event due to a calibration concern.
PIT56132018-05-21. Service bulletin. EQUIPMENT:APPLIANCE:AIR CONDITIONER. This Preliminary information communicates information to the technician about the HVAC pop-up on the radio display may show 61 degrees but the display on the HVAC knobs will show correct temp. Only the radio pop-up is showing the incorrect information. Technicians should not make any repairs. Dealer should communicate to the customer that we apologize for this inconvenience and that General Motors is working on a soulution.This PI will be replaced with a bulletin once repair information is available.
18NA0412018-05-21. Service bulletin. ELECTRICAL SYSTEM:SOFTWARE; EQUIPMENT:APPLIANCE:AIR CONDITIONER; ELECTRICAL SYSTEM. This technical bulletin provides a procedure to reprogram the HVAC module to correct a condition of HVAC Inoperative during Remote Start Event with Accessory Remote Start Kit due to a calibration concern.
174652018-04-02. Service bulletin. EQUIPMENT:APPLIANCE:AIR CONDITIONER. 17465 - Service Update. Certain vehicles equipped with air conditioning (RPO C4P or C67) and Engine Remote Start (RPO BTV) or Accessory Remote Start Kit (RPO S6P), when outside temperatures are below 42 degrees F (6 deg. C) may have a condition in which the heating, ventilation, air conditioning (HVAC) blower motor and defrost will not operate during an engine remote start event. Reprogram the HVAC control module.
PIT55972017-12-14. Service bulletin. EQUIPMENT:APPLIANCE:AIR CONDITIONER; ELECTRICAL SYSTEM:SOFTWARE. This preliminary information was created to communicate a software issue not allowing the HVAC to turn on when the vehicle is remote started. It functions correctly when started regularly. Engineering will release a calibration to fix this in the future.

The summaries are NHTSA's. Each bulletin's page links NHTSA's copy of the manufacturer's document.