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Service bulletin PIT6127

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 id10251691
Published by NHTSA2024-03-18
Manufacturer's numberPIT6127
Manufacturer's date2024-02-12
NHTSA componentELECTRICAL SYSTEM; VEHICLE SPEED CONTROL:CRUISE CONTROL

NHTSA's summary

This Preliminary information communicates a vehicle may come to the dealer with Super Cruise inoperative. On inspection the tech will find code B126B. Tech is given direction on how to update the Map module to restore function. Dealer is also given directions to give to customer to ensure they continue to receive updates.

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, Throttle and cruise control

Trouble codes named

B126B

Vehicles listed
CADILLAC CT62018, 2019, 2020
CADILLAC XT62022, 2023
CHEVROLET BOLT EUV2022, 2023

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

Recalls for the same vehicles and component
24V8120002024-10-31. ELECTRICAL SYSTEM:PROPULSION SYSTEM:TRACTION BATTERY THERMAL:MANAGEMENT:SOFTWARE; ELECTRICAL SYSTEM:PROPULSION SYSTEM:TRACTION BATTERY
24V4810002024-06-27. ELECTRICAL SYSTEM:PROPULSION SYSTEM:TRACTION BATTERY
20234862023-08-31. Electrical
21V6500002021-08-20. ELECTRICAL SYSTEM:PROPULSION SYSTEM:TRACTION BATTERY

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
24-NA-2022025-10-27. Service bulletin. This service bulletin provides dealers with Warranty Administration information on North American Charging Standard (NACS) DC Adapter Warranty Claim Information.
18-NA-1802025-10-16. Service bulletin. This Warranty Administration service bulletin provides Lithium-Ion battery Exchange Process and Transaction Submission information.
PIE0753I2025-09-30. Service bulletin. This engineering information (EI) will assist GM to recover a small number of electric vehicle battery packs from customer-owned vehicles in the field for further engineering study and analysis.
22-NA-0832025-09-27. Service bulletin. This service bulletin provides Requirements for Replacement of the Dual Mode Cord Set Under Warranty.
18-NA-1802025-09-26. Service bulletin. This Warranty Administration service bulletin provides Lithium-Ion battery Exchange Process and Transaction Submission information.
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.
24-NA-0682025-06-16. Service bulletin. This service bulletin provides a procedure to test and replace the battery distribution fuse block if found the cause of the DTC and electric coolant pump inoperative.
22-NA-2422025-06-16. Service bulletin. This warranty administration bulletin provides information for dealers/technicians on System Reset and Connector Reconnect Labor Code Numbers.
PIE08282025-06-12. Service bulletin. This engineering information (EI) is requesting information from technicians to perform the check list provided and contact the engineer listed in regard to the Malfunction Indicator Lamp (MIL) illuminated on Driver Information Center (DIC), DTCs P0D4D, P0D4E, P0D4F Set.
24-NA-2292025-06-03. Service bulletin. This bulletin provides a procedure on how to check for a battery drain utilizing the Picoscope and how to measure the load on the system that may be causing a drain.