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Service bulletins for the 2019 GMC Sierra

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.

2009 on file from NHTSA, as of 2026-10-19.

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By component

By trouble code

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

Bulletins, newest first
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.
PIT5736C2023-12-18. Service bulletin. VISIBILITY:DEFROSTER/DEFOGGER/HVAC SYSTEM. This Preliminary information communicates how the HVAC setting operates during a remote vehicle start.
PIT5767A2023-02-13. Service bulletin. VISIBILITY:DEFROSTER/DEFOGGER/HVAC SYSTEM:CONDENSOR/EVAPORATOR; VISIBILITY:DEFROSTER/DEFOGGER/HVAC SYSTEM. This Preliminary information communicates an issue with poor a/c performance and to replace the a/c condenser.
PIT5868B2023-02-13. Service bulletin. VISIBILITY:DEFROSTER/DEFOGGER/HVAC SYSTEM. This Preliminary information communicates an issues will low or poor heater performance on the drivers side. Dealers are to inspect the HVAC temperature door linkage and if ok replace the heater core.
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.
21-NA-0972022-07-01. Service bulletin. VISIBILITY:DEFROSTER/DEFOGGER/HVAC SYSTEM. This technical bulletin provides a procedure to install a pice of foam between the heater core pipes to correct the customers concern.
PIT58682021-12-13. Service bulletin. VISIBILITY:DEFROSTER/DEFOGGER/HVAC SYSTEM:HEATER CORE; EQUIPMENT ADAPTIVE/MOBILITY; EQUIPMENT. This Preliminary information communicates an issues will low or poor heater performance on the drivers side. Dealers are to inspect the HVAC temperature door linkage and if ok replace the heater core.
PIT5767A2021-06-14. Service bulletin. VISIBILITY; VISIBILITY:DEFROSTER/DEFOGGER/HVAC SYSTEM:CONDENSOR/EVAPORATOR; VISIBILITY:DEFROSTER/DEFOGGER/HVAC SYSTEM. This Preliminary information communicates an issue with poor a/c performance and to replace the a/c condenser.
PIT5736A2020-11-16. Service bulletin. EQUIPMENT:APPLIANCE:AIR CONDITIONER. This Preliminary information communicates how the HVAC setting operates during a remote vehicle start.
PIT57672020-09-14. Service bulletin. EQUIPMENT:APPLIANCE:AIR CONDITIONER; EQUIPMENT. This Preliminary information communicates an issue with poor a/c performance and to replace the a/c condenser.
N192265660-012020-04-20. Service bulletin. ELECTRICAL SYSTEM; VISIBILITY:DEFROSTER/DEFOGGER/HVAC SYSTEM:REAR WINDOW. Customer Satisfaction Program - Certain 2014-2019 model year Chevrolet Silverado and GMC Sierra vehicles equipped with a power sliding rear window (RPO A48) may have areas of high electrical resistance on the rear defroster circuit. This could be caused, in part, by mechanical stress from opening and closing the rear power window, intrusion of debris, and use of the rear defroster. Over time, this condition could generate heat that could melt the areas surrounding the circuit. In rare instances, this heat could cause a non-propagating fire, increasing the risk of property damage or injury. Dealers will replace the buss bar covers and contact cover. If the rear window or sliding glass assembly appears damaged due to an occurrence of high electrical resistance on the rear defroster circuit, they should also be replaced.
PIP56862019-11-12. Service bulletin. EQUIPMENT:APPLIANCE:AIR CONDITIONER. This Preliminary information communicates A vehicle may come into the dealer with a rough idle, lean running concern and/or air leak noise from the PCV system. Upon inspection the technician may find the SES lamp is illuminated and/or DTC?s P0171 and/or P0174 may be in active or stored history. This condition may be caused by an incorrectly installed foul air PCV tube or tube may be damaged
PIT5663A2019-09-16. Service bulletin. EQUIPMENT:APPLIANCE:AIR CONDITIONER; EQUIPMENT:ELECTRICAL. This PI was written to inform dealers of a condition where a "Climate off" message will be displayed on the screen even thought the HVAC system is fully operational. Dealers are also informed that engineering is working on a solution
PIT56632019-04-08. Service bulletin. EQUIPMENT:APPLIANCE:AIR CONDITIONER. This PI was written to inform dealers of a condition where a "Climate off" message will be displayed on the screen even thought the HVAC system is fully operational. Dealers are also informed that engineering is working on a solution
PIT56602019-04-08. Service bulletin. EQUIPMENT:APPLIANCE:AIR CONDITIONER; EQUIPMENT. This Preliminary information communicates repair information if the HVAC mode door actuator becomes lost and does not move to the correct mode position.
PIT5272B2018-12-17. Service bulletin. STRUCTURE; VISIBILITY:DEFROSTER/DEFOGGER/HVAC SYSTEM. This Preliminary Information communication provides information to the technician about vehicles that may have a whistle noise in the vehicle from the driver or passenger side. Technician will need to inspect for voids in the body sealer on the left or right side A-pillar. Technician should also inspect for voids in the body sealer at the cowl seam and apply sealer as necessary.
183382018-12-10. Service bulletin. EQUIPMENT:APPLIANCE:AIR CONDITIONER; EQUIPMENT. 18338 - Service Update. Certain vehicles may have a linkage to the HVAC front defrost door that is not fully seated and it may disconnect over time. Inspect the defrost linkage and repair if the linkage is not fully seated.

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