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Can weak batteries cause an ABS control module malfunction?

(1999 Ford F-350 Super Duty)
in Seffner, FL on November 18, 2010
The ABS light is on, the overdrive light keeps flashing, the speedometer quit. Ford said the ABS control module was not working. After I picked the truck up--they had placed it on diagnostics--it worked coming home. But, they put a quick charge on the weak batteries just prior to pick up.
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Popular Answer
on November 18, 2010
Full charge of the battery is around 12.6 volts. I feel like one of them may be low for you, as I would not expect the differentiation between the two batteries when running. They should be load tested for accurate results. If they pass, a charging system test is in order.
of Ware Racing Auto Repair on November 18, 2010
it is possible for low voltage to cause all your problems a would start by replacing bad batteries first then run diagnostics if you still have problems
on November 18, 2010
Thanks, that helps a lot. What should the reading on the two 12 volt series connected batteries be? Running I get 14.5 on one and 13.5 on the other; when still they both read 12.45.
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