I was under a KJ early this week that had an ABS light on all the time and no codes showing. It turned out to be a broken lead to the rear ABS sensor. I have also heard of the ABS light being on due to dirty ABS sensors. As to the combination that has me stumped. When did all of this happen?
today when i was doing 80 on the highway all the sudden the brake, abs lights came on and speedo died, the engine light came on later trying to get home
Could be failure of that rear speed sensor top of the rear diff. The ABS gets its reading for the back wheels there, that will throw a code for the ABS check cycle, the engine code, and explains the speedo not working. I've had one fail, it caused all three errors you explained. Other too have had similar experiences.
I have also had a front sensor fail that caused just the ABS light to come on.
Oh, the engine light will be because the transmission will not be reciving speed info at the TCM, so it will be running in default mode, engine will also be in a default mode for the same reasons. You'll probably notice weird gear changes, and a loss a power.
I had possibly the same problem (except speedo didn't read zero and cruise would get knocked out). It was an intermittent problem. Appears to have been a broken wire to a rear abs sensor.
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Help needed urgently! ABS, Brake and Engine Lights as well as speedo reading zero
