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Acc Pedal Buzz - From GM

B

Bobbll

GUEST
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.

- Thanks to GM Technical Assistance
 
Thanks for the info. I've been experiencing this almost exact problem. The only difference is I would describe it as a "thunk" sound rather than a buzz.
 
Bobbll,

Thank You !!!

I have been experiencing EXACTLY what you described and was wondering what the heck that was. Intuitively I was hoping that this was some kind of diagnostic/setting function, and nothing severe. Thanks to you, this is confirmed - no worries! I owe you an adult beverage of your choice.

Regards,
 
NavyAV said:
Thanks for the info. ?I've been experiencing this almost exact problem. ?The only difference is I would describe it as a "thunk" sound rather than a buzz.

Welcome aboard squid - er, I mean Navy guy/gal. Retired Jarhead here. Never really appreciated Naval customs and traditions until I spent three years on an AF base. Always good to have another member of the Naval community around.

I'm not sure my post applied to a "thunk." Hopefully it happens every time and you could make it happen if you took it back to the dealer. I think it would be a good idea to have the "thunk" looked at. Might be something loose. Might be something important.
 
pantherburn said:
Bobbll,

Thank You !!!

I have been experiencing EXACTLY what you described and was wondering what the heck that was. Intuitively I was hoping that this was some kind of diagnostic/setting function, and nothing severe. Thanks to you, this is confirmed - no worries! I owe you an adult beverage of your choice.

Regards,

I'm glad it helped.

BTW, that would be a tall Bud.


 
Your welcome Bobbll. I do hafta' say...it's always nice to have a Jarhead around. Spent 9 years at old Camp Swampy. Wish I was back there, some days. :)
 
I feel this "click", "clunk" constantly. I (unfortunately) drive in A LOT of stop and go traffic and I have been noticing this. I thought the A/C compressor was cycling on/off, but the A/C was not on. I guess this explains it. Very annoying.

 
Jason,

Actually, mine only does it once from initial start-up, until the ignition is cut off again - just like Bobll described. Sounds like you're experiencing something different.
 
NavyAV said:
Thanks for the info. ?I've been experiencing this almost exact problem. ?The only difference is I would describe it as a "thunk" sound rather than a buzz.

The thunk could also be the Anti-Lock brakes doing theri self check. They do it at about the same time as the booster pump. It too is explained in the owners manual as normal.

SJP-=
 
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