CEL ABS error Composite Connector 9800; left frame rail behind cab

[Rawze]

(07-06-2019 )rrod Wrote:  Wow, that could be my problem. Can u talk about when and why the ABS light would turn on ?

Mine has the ramp tabs in good working condition, but when I move it with my hands, the ABS light turns on. The strange thing is that sometimes it turns on for no apparent reason. It’s not necessarily when it rains. Sometimes it’s in the morning after cranking the engine. It can be perfect for weeks before it starts bugging again.

I have tried repairing cables that looked bad and cleaned the contacts inside the connectors. But it always comes back.

Could be wiring, but most of the time, it is a wheel bearing out of adjustment, and your first sign that no one has tightened the wheel bearings (every 200k miles or so) at regular intervals like they should be doing. This also makes for excess tire edge wear on the rear axles.