GM TechLink 2003-03-01
Original text and source
Original text
Accelerator Pedal Buzz and Vibration
This condition affects some 2003 Silverado, Suburban, Tahoe, Avalanche, Sierra, Yukon, Denali, Escalade, and EXT vehicles.
Owners may experience a buzz noise which can be heard and felt, from the accelerator pedal area on the first acceleration after starting the vehicle. It will occur only the first time the vehicle reaches approximately 10 mph (16 kph) after start-up.
It will not occur again until the key is cycled off then on. Based on the driving habits of the owner, the condition may occur at approximately the same time as the 1-2 shift of the automatic transmission.
This noise is caused by the Supplemental Brake Assist (SBA) performing a self-test. The SBA, which is mounted to the brake vacuum booster canister, is new for 2003 and provides vacuum for the brake booster in case of low vacuum or vacuum loss.
This is a normal condition and no repair attempts should be made.
The SBA is used only on vehicles equipped with vacuum brake boosters and is not used on vehicles equipped with Hydra-Boost brake systems.
Source
- Source
- GM TechLink — Communication from a manufacturer to dealers (summary published by a government agency)
- Reporter type
- Manufacturer
- Source reference
- 2003-03-01
- Country / market
- US
- Language
- en
- Document version
- Version 3 (3 held)
- Note on the source
- Copyright General Motors Corporation. No licence is stated. Held as the headline and short quoted passages with the issue named and linked; the articles themselves are not stored or shown.
Dates
- Incident date
- Unknown
- Received by source
- 2003-03-01
- Added to the source's file
- Unknown: not returned by the source API
- Issued / published
- 2003-03-01
- First observed
- 2026-10-06 09:03 UTC (initial bulk load)
- This version fetched
- 2026-10-09 12:52 UTC