# 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: 10205576
- Published by NHTSA: 2021\-12\-27
- Manufacturer's number: 21NA256
- Manufacturer's date: 2021\-11\-09
- NHTSA component: EXTERIOR 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

- [NHTSA's copy of the document (PDF)](https://static.nhtsa.gov/odi/tsbs/2021/MC-10205576-0001.pdf)
- [If that address does not open, try this one](https://static.nhtsa.gov/odi/tsbs/2021/MC-10205576-9999.pdf)

The document is the manufacturer's. This site does not hold it.

## Components

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

## Trouble codes named

P26BB

## Vehicles listed

- 2019 to 2022 BUICK ENCORE
- 2020 to 2022 BUICK ENCORE GX
- 2020 to 2022 CADILLAC CT4
- 2020 to 2022 CADILLAC CT5
- 2019 to 2022 CADILLAC XT4
- 2019 to 2022 CADILLAC XT5
- 2019 to 2022 CHEVROLET BLAZER
- 2019 to 2022 GMC ACADIA

## Recalls for the same vehicles and component

- [2024060](/recalls/tc/2024060.md), 2024-02-01: Lights And Instruments
- [2023591](/recalls/tc/2023591.md), 2023-11-02: Lights And Instruments
- [2022700](/recalls/tc/2022700.md), 2022-12-08: Lights And Instruments
- [22V903000](/recalls/nhtsa/22V903000.md), 2022-12-08: EXTERIOR LIGHTING:LIGHTING CONTROL MODULE:SOFTWARE
- [2022671](/recalls/tc/2022671.md), 2022-11-23: Visual System
- [2022536](/recalls/tc/2022536.md), 2022-09-22: Visual System
- [2021365](/recalls/tc/2021365.md), 2021-06-10: Accessories
- [21V440000](/recalls/nhtsa/21V440000.md), 2021-06-10: EQUIPMENT:MECHANICAL:ACCESSORY SCISSOR/SCREW/BOTTLE JACK/LIFT:STAND

## Other bulletins for the same vehicles and component

- [25\-NA\-106](/bulletins/11022031.md), 2025-08-21, Service bulletin: ELECTRICAL SYSTEM; VISIBILITY/WIPER. This Service Bulletin provides information on the rearview camera transitioning from Dark to light and the adjustment time period of 20 seconds.
- [23\-NA\-086](/bulletins/11014377.md), 2025-02-20, Service bulletin: EXTERIOR LIGHTING. 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\-043](/bulletins/11014230.md), 2025-02-12, Service bulletin: VISIBILITY/WIPER; SERVICE BRAKES; ENGINE; ELECTRICAL SYSTEM; WHEELS. 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\-001Q](/bulletins/11014170.md), 2025-02-11, Service bulletin: EXTERIOR LIGHTING. This service bulletin provides information on Exterior Lamp Condensation and Water Leak Information and Replacement Guidelines.
- [23\-NA\-086](/bulletins/11011117.md), 2024-12-04, Service bulletin: EXTERIOR LIGHTING. 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\-086](/bulletins/11007940.md), 2024-09-21, Service bulletin: EXTERIOR LIGHTING. This service bulletin provides information on dark spots in the headlamp pattern when the vehicle is pulled up to a wall or garage.
- [PI0754G](/bulletins/11006511.md), 2024-08-17, Service bulletin: VISIBILITY/WIPER. This PI provides information on Rear and Side Tempered Glass Spots \(Quench Marks\) and that they are a normal characteristic.
- [23\-NA\-084](/bulletins/11006379.md), 2024-08-15, Service bulletin: BACK OVER PREVENTION: REARVIEW SYSTEM BRAKING; VISIBILITY/WIPER; ELECTRICAL SYSTEM. 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\-342](/bulletins/11006284.md), 2024-08-13, Service bulletin: ELECTRICAL SYSTEM; VISIBILITY/WIPER. 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\-342](/bulletins/11004728.md), 2024-07-16, Service bulletin: ELECTRICAL SYSTEM; VISIBILITY/WIPER. 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.

JSON: [/v1/bulletins/10205576](/v1/bulletins/10205576)

[Report an error on this page](https://github.com/wenmar-pro/wenmar-open/issues/new?template=data_correction.yml&title=Data%20correction%3A%20Service%20bulletin%2021NA256&page=https%3A%2F%2Fopen.wenmarpro.com%2Fbulletins%2F10205576&vehicle=Service%20bulletin%2021NA256)