Over-the-air update notice 663.20

Manufacturer communication, from NHTSA Manufacturer Communications

Published by NHTSA: Aug 31, 2026
Manufacturer: GMC
NHTSA ID: 11036478
NHTSA category: Over The Air
Applies to, as stated by NHTSA: CHEVROLET SILVERADO 1500 2026; GMC SIERRA 1500 2026
Component, as stated by NHTSA: UNKNOWN OR OTHER

Text of the manufacturer communication

This update contains a required software change to help improve the overall software update and diagnostics process. Be sure to install this update to be able to receive future software updates.

Manufacturer document number: 663.20
Date of the communication: 2026-08-24
Manufacturer campaign or software version: 663.20
Manufacturer component system: CGM / CGM-GTW (Communication Gateway Module)

View original source on NHTSA.gov

NHTSA reuses some ID numbers across record types. If its page lists more than one record, this one is the manufacturer communication dated Aug 31, 2026.

For the 2022 Chevrolet Silverado 1500

LT Trail Boss Crew Cab

Ignored

Relevance of 9% is under one half, so the notice is ignored whatever the other figures say.

Vehicle relevance: 9%
Attention: 30%
Interrupt probability: 26%

Importance to this owner: 0.2 of 4, none
Vehicle area the notice is about: Software

This manufacturer communication does not appear to warrant attention for this vehicle.

Decided by jev-1.13.0 in 159 ms from 1,611 input tokens. Jev returns these figures and nothing else. It gives no reasons, and none are written for it here. The figures describe how relevant the notice is, not the condition of any vehicle.

Checked by code against NHTSA's fields

A plain comparison with the structured fields NHTSA filled in. Separate from Jev's decision.

YesNHTSA names this make
YesNHTSA names this model (listed as SILVERADO 1500)
NoNHTSA lists model year 2022 for this model

The same notice, every vehicle

Relevance	Attention	Interrupt	State
9%	30%	26%	Ignored
2%	6%	6%	Ignored
2%	5%	6%	Ignored
2%	7%	8%	Ignored
2%	6%	6%	Ignored
2%	6%	8%	Ignored
2%	7%	7%	Ignored
2%	6%	6%	Ignored
2%	5%	6%	Ignored
1%	7%	7%	Ignored
1%	5%	5%	Ignored
1%	5%	6%	Ignored
1%	4%	5%	Ignored
1%	5%	5%	Ignored
1%	5%	6%	Ignored
1%	5%	6%	Ignored

Select a vehicle to see its attention and interrupt figures above.