Over-the-air update notice 662.21

Manufacturer communication, from NHTSA Manufacturer Communications

Published by NHTSA: Aug 31, 2026
Manufacturer: CHEVROLET
NHTSA ID: 11036471
NHTSA category: Over The Air
Applies to, as stated by NHTSA: CHEVROLET SILVERADO 1500 2025; GMC SIERRA 1500 2025
Component, as stated by NHTSA: UNKNOWN OR OTHER

Text of the manufacturer communication

• Fixes to help ensure proper functionality for heating and cooling features. • Improvements to night mode lights for shifting gears. • Fixes for Daytime Running Lamps turning on when set to Off. • Fixes to help prevent erroneous missing key messages on driver display. • Fixes for accuracy of low tire pressure alert. • Fixes for speed threshold for pedestrian alerts. • Improvements to start reliability and reduced check engine light activation • Improvements to turbo system diagnostics • Improvements to reliability when extending the running boards on your vehicle • Improves transmission diagnostic software. • Reduces unnecessary check engine light activations. • Fixes to help extend coolant valve life through diagnostic changes

Manufacturer document number: 662.21
Date of the communication: 2026-08-05
Manufacturer campaign or software version: 662.21
Manufacturer component system: BCM, TCM, ECM / BCM (Body Control Module), TCM (Transmission Control Module), ECM (Engine Control 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: 28%
Interrupt probability: 20%

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 154 ms from 1,738 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%	28%	20%	Ignored
2%	6%	6%	Ignored
2%	5%	5%	Ignored
2%	5%	6%	Ignored
2%	6%	6%	Ignored
1%	4%	5%	Ignored
1%	4%	5%	Ignored
1%	5%	5%	Ignored
1%	5%	5%	Ignored
1%	5%	6%	Ignored
1%	4%	5%	Ignored
1%	4%	5%	Ignored
1%	4%	5%	Ignored
1%	5%	6%	Ignored
1%	5%	5%	Ignored
1%	5%	5%	Ignored

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