Supplemental Brake Assist Noisy and May Run Continuously - kw booster brake condition GMT800 GMT805 GMT806 GMT820 GMT830 JC3 JC4 noise pedal vacuum

When servicing the vehicle with the VIN you entered, the following diagnosis might be helpful if the vehicle exhibits the described symptoms.

Supplemental Brake Assist (SBA) motor is noisy and runs when brake pedal is depressed and may continuously run when brake pedal is released.

Use P/N 89040236 to correct this customer concern.

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Please follow this diagnosis process thoroughly and complete each step. If the condition exhibited is resolved without completing every step, the remaining steps do not need to be performed. If these steps do not resolve the condition, please contact GM TAC for further diagnostic assistance. This diagnostic approach was developed for the vehicle with the VIN you entered and should not be automatically be used for other vehicles with similar symptoms.

(03 Chevrolet Silverado, Suburban, Tahoe, Avalanche) and (03 GMC Sierra, Yukon, Yukon XL) and (03 Cadillac Escalade, EXT 2-wheel drive)

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