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Old 11-17-2013, 09:19 PM   #1 (permalink)
Rooster Tail
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Join Date: Jul 2005
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C0055 ABS code and spedometer works

In case someone else has this problem. Model year 2005 2500hd. Had the ABS and brake lights on, and C0055 ABS code. But the speedometer and the cruise control were working. The abs module gets the rear wheel speed from PCM. So check that circuit. With the ignition on, there should be 10v on that circuit from the PCM. Then when the rear wheels are turning, should be 0.1 to 0.5 AC signal.

In my case, mice built a nest under the engine compartment fuse box and cut the speed sensor signal. It seems that mice trying to live under there is pretty common.
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2005 2500HD 4x4 LT Crew Cab, Short Bed, D/A
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