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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.

The communication, as NHTSA indexes it (as of 2026-10-19)
TypeService bulletin
NHTSA id10205576
Published by NHTSA2021-12-27
Manufacturer's number21NA256
Manufacturer's date2021-11-09
NHTSA componentEXTERIOR LIGHTING; EQUIPMENT; VISIBILITY:DEFROSTER/DEFOGGER/HVAC SYSTEM:ENGINE COOLANT HOSES AND FITTINGS

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

Equipment and accessories, Glass, wipers and mirrors, Heating and air conditioning, Lighting

Trouble codes named

P26BB

Vehicles listed
BUICK ENCORE2019, 2020, 2021, 2022
BUICK ENCORE GX2020, 2021, 2022
CADILLAC CT42020, 2021, 2022
CADILLAC CT52020, 2021, 2022
CADILLAC XT42019, 2020, 2021, 2022
CADILLAC XT52019, 2020, 2021, 2022
CHEVROLET BLAZER2019, 2020, 2021, 2022
GMC ACADIA2019, 2020, 2021, 2022

Listing a model year does not mean every vehicle of it is concerned: the document says which.

Recalls for the same vehicles and component
20240602024-02-01. Lights And Instruments
20235912023-11-02. Lights And Instruments
20227002022-12-08. Lights And Instruments
22V9030002022-12-08. EXTERIOR LIGHTING:LIGHTING CONTROL MODULE:SOFTWARE
20226712022-11-23. Visual System
20225362022-09-22. Visual System
20213652021-06-10. Accessories
21V4400002021-06-10. EQUIPMENT:MECHANICAL:ACCESSORY SCISSOR/SCREW/BOTTLE JACK/LIFT:STAND

A recall listed here may apply to some of the same vehicles. Only the manufacturer can say whether it applies to one vehicle.

Other bulletins for the same vehicles and component
25-NA-1062025-08-21. Service bulletin. This Service Bulletin provides information on the rearview camera transitioning from Dark to light and the adjustment time period of 20 seconds.
23-NA-0862025-02-20. Service bulletin. This service bulletin provides information on dark spots in the headlamp pattern when the vehicle is pulled up to a wall or garage.
21-NA-0432025-02-12. Service bulletin. This bulletin advises the dealers to maintain the vehicle stock on hand by doing a full inspection on the vehicles before being sold (prepping) to the customer.
01-08-42-001Q2025-02-11. Service bulletin. This service bulletin provides information on Exterior Lamp Condensation and Water Leak Information and Replacement Guidelines.
23-NA-0862024-12-04. Service bulletin. This service bulletin provides information on dark spots in the headlamp pattern when the vehicle is pulled up to a wall or garage.
23-NA-0862024-09-21. Service bulletin. This service bulletin provides information on dark spots in the headlamp pattern when the vehicle is pulled up to a wall or garage.
PI0754G2024-08-17. Service bulletin. This PI provides information on Rear and Side Tempered Glass Spots (Quench Marks) and that they are a normal characteristic.
23-NA-0842024-08-15. Service bulletin. This service bulletin provides repair information to correct a customer concern of a Blue Hourglass and No Gridlines on Radio Rear View Camera Display While in Reverse.
16-NA-3422024-08-13. Service bulletin. This service bulletin provides a procedure to check the rearview mirror coax connector for looseness by disconnecting and reconnecting the electrical connector to correct the customers concern for the rearview mirror video screen displaying blue.
16-NA-3422024-07-16. Service bulletin. This service bulletin provides a procedure to check the rearview mirror coax connector for looseness by disconnecting and reconnecting the electrical connector to correct the customers concern for the rearview mirror video screen displaying blue.