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Having a problem with 2009 Silverado 3500 HD Duramax with Allison transmission. Dealership can not locate problem. Brake warning light comes on momentarily with a bell that will ring 3 to 5 times. Usually occurs when slowing down or turning sharply. Code U0100 appears however they checked Service bulletin 08 07 30 021H with no problem found.
Vehicle: 2009 Silverado 3500HD DURAMAX 6.6 Allison transmission.

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