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Service bulletin PIT5777A

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 id10187163
Published by NHTSA2021-02-16
Manufacturer's numberPIT5777A
Manufacturer's date2020-12-03
NHTSA componentEXTERIOR LIGHTING; AIR BAGS

NHTSA's summary

This Preliminary information communicates an issue with a Check Reverse Lamp message on the DIC, but the reverse light operate. Engineering has released updated cals to correct this concern.

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

Air bags, Lighting

Vehicles listed
CHEVROLET SUBURBAN2021
CHEVROLET TAHOE2021

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
20234722023-08-24. Lights And Instruments
20226342022-11-03. Lights And Instruments
22V8270002022-11-03. EXTERIOR LIGHTING:LIGHTING CONTROL MODULE:SOFTWARE
21V4210002021-06-10. AIR BAGS:SRS MALFUNCTION WARNING LAMP/LIGHT; ELECTRICAL SYSTEM:SOFTWARE
20213482021-06-03. Airbag

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
21-NA-1662025-06-06. Service bulletin. This informational bulletin provides information on the turn signal stalk not cancelling and/or mis cancelling.
01-08-42-001Q2025-02-11. Service bulletin. This service bulletin provides information on Exterior Lamp Condensation and Water Leak Information and Replacement Guidelines.
21-NA-2752024-12-19. Service bulletin. This service bulletin provides repair information to correct customer concerns of Wheel Lock Up, ABS Event, Loud Bang and a Flashing “D” on Driver Information Center (DIC) when Lightly or Moderately Accelerating Forcing an 8-7 or 8-6 Downshift.
22-NA-2442024-05-30. Warranty extension. This service bulletin provides information about GM Accessories - Dealer-Installed, Repaired or Replaced During Warranty Coverage Period.
PIT5989A2024-03-18. Service bulletin. This Preliminary information communicates a issue where the Can bus 1 data line is being corrupted by a aftermarket lighting module or poor connection installed by a Police Upfitter.
02-08-42-001J2024-01-19. Service bulletin. This informational bulletin provides information for dealers/technicians on Headlamp, Tail Lamp, License Lamp or Fog/Driving Lamp Damage.
21-NA-1352023-11-29. Service bulletin. This service bulletin provides information to inform dealership personnel about Law Enforcement and Government vehicles that request to disable or enable content.
N2324087302023-11-22. Service bulletin. Service Update. Certain Vehicles may not have the emergency light flashers enabled. Dealers are to reprogram the body control module and lighting control module.
21-NA-1662023-09-29. Service bulletin. This informational bulletin provides information on the turn signal stalk not cancelling and/or mis cancelling.
23-NA-0852023-07-27. Service bulletin. This technical bulletin provides a procedure to correct the condition of Service Restraint System Message / Air Bag Warning MIL / DTC B14DC Set.