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Service bulletin 14815B

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 id10057976
Published by NHTSA2015-07-20
Manufacturer's number14815B
Manufacturer's date2015-03-01
NHTSA componentVISIBILITY:DEFROSTER/DEFOGGER/HVAC SYSTEM:REAR WINDOW

NHTSA's summary

THIS TSB CONTAINS AN OWNER NOTIFICATION LETTER. SELECT DOCUMENT SEARCH BUTTON BELOW. GENERAL MOTORS 2015 CHEVROLET SILVERADO, SIERRA EQUIPPED WITH RPO C49 ELECTRIC REAR WINDOW DEFOGGER. THIS IS A REVISED COPY OF BULLETIN 14815A. *LJ

The document

No address for NHTSA's copy can be built for this communication. Ask the dealer for it by the manufacturer's number.

Components

Glass, wipers and mirrors, Heating and air conditioning

Vehicles listed
CHEVROLET SILVERADO2015
GMC SIERRA2015

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

Other bulletins for the same vehicles and component
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.
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.
PIT5387B2024-04-01. Service bulletin. Radio HVAC IPC Blank Out When Operating A Snow Plow.
PIT53472024-04-01. Service bulletin. Sunroof Reverses When Closing At Highway Speeds.
PIT52932024-01-08. Service bulletin. Unwanted A/C Compressor Operation After Being Turn Off (Normal Operation.
PIT5099G2023-12-26. Service bulletin. This Preliminary Information communication provides information to the technician about vehicles that the Heater-Vent-Air Conditioning blows warm air. Before calling General Motors Technical Assistance Center technician will need to have high and low pressures, outside temperature, humidity, and vent temperature.
PIT5099A2023-12-11. Service bulletin. A/C Blows Warm Or Poor Performance.
130089004H2023-12-11. Service bulletin. Car and Truck Fix it Right the First Time Issues
PI0754F2023-03-03. Service bulletin. This PI provides information on Rear and Side Tempered Glass Spots (Quench Marks) and that they are a normal characteristic.
PIP5540J2023-01-30. Service bulletin. This Preliminary information communicates to the technician the need to inspect the induction system for potential icing issues in very cold ambient temperatures. To allow the ice to melt so that it can be drained from the related components. That any of the listed DTC's may set with or without poor engine performance.