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06 GMC Sierra 2500 HD Duramax. Rear ABS coming on just as…

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06 GMC Sierra 2500 HD...
06 GMC Sierra 2500 HD Duramax. Rear ABS coming on just as vehicle is rolling to a stop. Harsh 2-1 downshift occurs at same time. No lights on dash. ????
Submitted: 10 months ago.Category: GMC
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Answered in 42 minutes by:
6/8/2017
GMC Mechanic: Anthony Uzmack, ASE Certified Technician replied 10 months ago
Anthony Uzmack
Anthony Uzmack, ASE Certified Technician
Category: GMC
Satisfied Customers: 47
Experience: GM Certified Service Technician
Verified

Hello, Let me see if I can shed some light on whats going on.

Does the ABS kick in with in the last couple mph before the stop? There is a big issue with GM trucks and the front wheel speed sensors getting rust under them causing incorrect wheel speed sensor readings causing low speed ABS activation coming to a stop. Since the ABS is activating the 2-1 shift will feel a little more harsh than usual. This also will not present a fault code or light.

To correct this condition you can try removing the front brakes, then removing the wheel speed sensors in the front hubs and cleaning the sensor mount on the hub with wire brush or sand paper. Make sure to wipe the sensor down as well.

Hopefully this information helps you solve the problem.

IF you find this answer acceptable please click accept answer and give me a positive rating so that I can be credited for this question. Thank you very much.

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GMC Mechanic: Anthony Uzmack, ASE Certified Technician replied 10 months ago

any update on this condition?

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Anthony Uzmack
Anthony Uzmack
Anthony Uzmack, ASE Certified Technician
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