# Service bulletins for the 2026 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. 310 bulletins from NHTSA, as of 2026-10-19. - [PIT6110L](/bulletins/11038460.md), 2026-10-14, Service bulletin: UNKNOWN OR OTHER. This Preliminary information communicates an issue with the SES MIL and DTC P062B and engineering is currently investigating. - [PIT6477D](/bulletins/11038139.md), 2026-10-06, Service bulletin: UNKNOWN OR OTHER. This preliminary PI was created to advise techniians in the field that they will not be able to perform a GDS automated bleed with the scan tool dues to a issue with the software in the scan tool - [PIT6457C](/bulletins/11038136.md), 2026-10-05, Service bulletin: UNKNOWN OR OTHER. This preliminary information is for technicians that may see DTCs that are history and should not perform any part replacements. They should follow the notes mentioned prior to anything being replaced. - [PIC6540K](/bulletins/11038132.md), 2026-10-05, Service bulletin: UNKNOWN OR OTHER. This Preliminary information communicates to dealers a procedure to reset the radio. - [PIT6368E](/bulletins/11037797.md), 2026-10-02, Service bulletin: UNKNOWN OR OTHER. This Preliminary information communicates an issue with the virtual garage door opener not programming to a garage opener. Engineering is working on a new module. - [PIT6553](/bulletins/11037558.md), 2026-09-30, Service bulletin: UNKNOWN OR OTHER. This Preliminary information communicates that Engineering is working on a resolution and no parts should be replaced at this time. - [PIT5698F](/bulletins/11037555.md), 2026-09-30, Service bulletin: UNKNOWN OR OTHER. This PI provides Diagnostics tips on how the LIN bus works and how to diagnosis it. - [PIT6549](/bulletins/11037551.md), 2026-09-29, Service bulletin: UNKNOWN OR OTHER. This preliminary information communicates an issue with a service column lock message and DTC U3000. Engineering is working on the issue and in the meantime dealerships are to reset/clear the DTC and perform four sleep cycles to verify the DTC does not return. - [PIT6426C](/bulletins/11037446.md), 2026-09-22, Service bulletin: UNKNOWN OR OTHER. If a vehicle has an issue with super cruise inoperative tech is directed to follow a diagnostic path before replacing the Image processing module. - [PIT6545A](/bulletins/11037445.md), 2026-09-22, Service bulletin: UNKNOWN OR OTHER. This PI is created to inform GM dealers that some vehicles may intermittently fail to connect wireless Apple CarPlay or Android Auto after Bluetooth pairing during the first key cycle. The condition is caused by a software anomaly. - [N262567720](/bulletins/11037330.md), 2026-09-17, Service campaign: POWER TRAIN. Certain vehicles may have received transmission mounting bolts that do not meet expected hardness specifications. Loose or failed bolts may result in hard shifting from the transmission and/or noise. Dealers will replace both transmission mounting bolts. - [PIC6629F](/bulletins/11037320.md), 2026-09-16, Service bulletin: UNKNOWN OR OTHER. This PI is to instruct dealer on diagnostic procedures that need to be completed prior to replacing a radio or IPC display - [PIT6545](/bulletins/11037258.md), 2026-09-10, Service bulletin: UNKNOWN OR OTHER. This PI is created to inform GM dealers that some vehicles may intermittently fail to connect wireless Apple CarPlay or Android Auto after Bluetooth pairing during the first key cycle. The condition is caused by a software anomaly. Do not replace parts. Engineering is investigating the root cause; customers may continue to drive the vehicle. This PI will be updated or replaced by a TSB once a resolution is determined. - [PIT6543](/bulletins/11037255.md), 2026-09-10, Service bulletin: UNKNOWN OR OTHER. This preliminary information communicates a diagnostic tip for the tailgate release system and tailgate ajar message. - [PIP4902W](/bulletins/11037253.md), 2026-09-10, Service bulletin: UNKNOWN OR OTHER. This preliminary information advises a dealer on how to email GDS2 session logs into Technical Assistance. - [PIT6533B](/bulletins/11036715.md), 2026-09-02, Service bulletin: UNKNOWN OR OTHER. This Preliminary information communications information on a Short Range Radar software anomaly causing false / ghost left or right side object detection alerts. - [PIT6503E](/bulletins/11036709.md), 2026-09-02, Service bulletin: UNKNOWN OR OTHER. This preliminary information is to inform technicians that GM is placing the B174W Front View Camera Module \(ACP2\) on part restriction due to elevated replacement rates and ongoing engineering investigation. Technicians must not replace the front camera module unless they have: 1.Completed the diagnostic procedure in this PI, and 2.Contacted TAC and received authorization, including the SI document number and specific step that directs camera replacement. - [PIT6455C](/bulletins/11036707.md), 2026-09-02, Service bulletin: UNKNOWN OR OTHER. This PI communications information that Engineering has released an OTA to correct the Service Driver Assist message with current DTC B1B2F Telematics Control Module and U1624 Image Processing Control Module setting. - [PIT6529B](/bulletins/11036704.md), 2026-09-02, Service bulletin: UNKNOWN OR OTHER. This PI was created to address an Intermittent Loss of Connectivity, GPS, or Wi\-Fi Due to OnStar Module concern. - [PIT6541](/bulletins/11036690.md), 2026-09-02, Service bulletin: UNKNOWN OR OTHER. This Preliminary information communicates to the technicians a diagnostic tip if a technician loses communication with the image processor \#2 and how to restore communication - [N26\-254904](/bulletins/11036479.md), 2026-08-31, Over\-the\-air update: UNKNOWN OR OTHER. • Fixes to help prevent false Service Driver Assist System messages. • Improvements to connectivity for OnStar. - [663.20](/bulletins/11036478.md), 2026-08-31, Over\-the\-air update: UNKNOWN OR OTHER. This update contains a required software change to help improve the overall software update and diagnostics process. Be sure to install this update to be able to receive future software updates. - [662.40](/bulletins/11036477.md), 2026-08-31, Over\-the\-air update: UNKNOWN OR OTHER. • Additional protection for battery health and to help prevent battery drain • Improved charging messaging in the driver display • Improved vehicle diagnostics - [N262572131](/bulletins/11036440.md), 2026-08-28, Service campaign: ENGINE. Customer Satisfaction Program. Certain vehicles listed above may have a condition in which the oil galley in the cylinder head was not drilled properly. Dealers are to perform the inspection procedure contained within this bulletin. - [PIT6452E](/bulletins/11036401.md), 2026-08-27, Service bulletin: UNKNOWN OR OTHER. This is a diagnostic PI to assist on a repair to fix a concern for the HVAC temperature doors binding at times More: [the next page](/v1/vehicles/2026_gmc_sierra/bulletins?cursor=2026-08-27_11036401) (JSON) JSON: [/v1/vehicles/2026_gmc_sierra/bulletins](/v1/vehicles/2026_gmc_sierra/bulletins) [Report an error on this page](https://github.com/wenmar-pro/wenmar-open/issues/new?template=data_correction.yml&title=Data%20correction%3A%202026%20GMC%20Sierra&page=https%3A%2F%2Fopen.wenmarpro.com%2Fmakes%2Fgmc%2Fsierra%2F2026%2Fbulletins&vehicle=2026%20GMC%20Sierra)