Service bulletin 21NA256
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.
| Type | Service bulletin |
|---|---|
| NHTSA id | 10207916 |
| Published by NHTSA | 2022-02-14 |
| Manufacturer's number | 21NA256 |
| Manufacturer's date | 2021-12-13 |
| NHTSA component | ELECTRICAL SYSTEM:SOFTWARE; ENGINE AND ENGINE COOLING:ENGINE:ENGINE CONTROL MODULE (ECU/ECM); EXTERIOR LIGHTING |
NHTSA's summary
This service bulletin provides repair information for dealers/technicians to correct a customer concern of a Malfunction Indicator Lamp Illuminated with DTC P26BB Set.
The document
The document is the manufacturer's. This site does not hold it. NHTSA files a document at one of these two addresses; we have not asked NHTSA which.
Components
Electrical system, Engine, Lighting, Engine control module, Software
Trouble codes named
P26BB
| BUICK ENCORE | 2019, 2020, 2021, 2022 |
|---|---|
| BUICK ENCORE GX | 2020, 2021, 2022 |
| CADILLAC CT4 | 2020, 2021, 2022 |
| CADILLAC CT5 | 2020, 2021, 2022 |
| CADILLAC XT4 | 2019, 2020, 2021, 2022 |
| CADILLAC XT5 | 2019, 2020, 2021, 2022 |
| CHEVROLET BLAZER | 2019, 2020, 2021, 2022 |
| CHEVROLET SILVERADO 1500 | 2019, 2020, 2021, 2022 (the catalog's model; the bulletin names a series or trim of it) |
| GMC ACADIA | 2019, 2020, 2021, 2022 |
| GMC SIERRA 1500 | 2019, 2020, 2021, 2022 (the catalog's model; the bulletin names a series or trim of it) |
Listing a model year does not mean every vehicle of it is concerned: the document says which.
| 21V421000 | 2021-06-10. AIR BAGS:SRS MALFUNCTION WARNING LAMP/LIGHT; ELECTRICAL SYSTEM:SOFTWARE |
|---|---|
| 21V346000 | 2021-05-13. ENGINE AND ENGINE COOLING:ENGINE:ENGINE CONTROL MODULE (ECU/ECM):SOFTWARE |
A recall listed here may apply to some of the same vehicles. Only the manufacturer can say whether it applies to one vehicle.
| PIT5954C | 2024-04-15. Service bulletin. This Preliminary information communicates a Radio software update resolution for OnStar LED Red And Wifi Hotspot Inoperative After Remote Vehicle Start concern. |
|---|---|
| 20-NA-132 | 2024-04-05. Service bulletin. This warranty administration bulletin provides policy information on the requirements for 12V battery testing and warranty replacements. |
| PIT5687A | 2024-02-12. Service bulletin. This Preliminary information communicates some diagnostic tips to inspect for no/low voltage at the ECM for a customers complaints of a SES MIL, Crank No Start, stalling DTC's: P16A7 and/or P16AF. |
| N232412712 | 2023-12-06. Service bulletin. Service Update - Certain vehicles with a 2.0L engine have an Engine Control Module (ECM) that may not properly diagnose, may not set Diagnostic Trouble Codes (DTCs), or may not illuminate the Malfunction Indicator Light (Check Engine Light) if certain fault conditions of the catalytic converter were to occur. Owners who have accepted applicable terms and conditions will have the opportunity to accept these software changes using wireless over-the-air (OTA) technology without having to bring their vehicle to a dealership. Alternatively, owners may have their vehicle serviced at a GM dealer to receive these software updates. Dealers are to reprogram the ECM. |
| 23-NA-143 | 2023-10-18. Service bulletin. This technical bulletin provides repair information to correct a customer concern of Radio Software Version Y169– Multiple Updates for IOK. |
| 23-NA-118 | 2023-10-18. Service bulletin. This technical bulletin provides repair information to correct a customer concern of Radio Software Version Y168 – Multiple Updates for IOK. |
| N23-241156 | 2023-08-24. Service bulletin. (There may be future updates under this same release number.) Your vehicle keeps getting better. This vehicle software update includes the following: Refinements • Updates made to the overall vehicle software update process. Better Never Stops™ |
| N222383020 | 2023-07-25. Service bulletin. Service Update: Certain vehicles may have an Engine Control Module that does not properly respond to certain service tool requests for the datafile CALID (part number) and CVN (checksum). This condition may cause a vehicle to fail an emissions Inspection/Maintenance (I/M) test. Dealers are to reprogram the Engine Control Module. |
| PIT6005 | 2023-05-15. Service bulletin. This Preliminary information communicates of a software concern that General Motors is working on a fix for |
| PIP5628F | 2023-05-15. Service bulletin. This Preliminary information communicates information that will need to be provided to TAC to aid in diagnosing if a vehicle comes in with misfire and DTC Codes P0300 - P0308 and/or P050D |