Heading home one night in my 03 Silverado & ABS comes on, odometer starts flipping back and forth and dash flashing. Truck goes into limp mode.

We’ve disconnected batteries, checked ground wires, other wires etc. for anything chewed up, actual ABS sensors are fine and can’t clear codes. Any other advice/experience with something like this? I’m sure it’s something simple we just haven’t found yet.

 

Check your ignition switch. Had multiple odd things occurring with our 99 Buick Century. Changed out the ignition switch and wacko unrelated problems vanished. It's been 4 years without problems.

Good Luck!