A poor electrical ground under the battery tray may cause the ABS warning light to illuminate. Our technicians tell us that cleaning and properly securing this ground and also the main ABS ground on the frame rail below the drivers door may be necessary.
ABS Light Due to Poor Electrical Ground Under the Battery Tray on GMC Sierra 2500 HD
Average mileage: 139,800 (58,000–200,000)
12 people reported this problem
2004 GMC Sierra 2500 HD 120,000 mi, Visitor
Everytime you hit bump ABS light comes and goes