brake controller unit
In following up to determining our "gear ratio", I found another code in the glove box, the JL4. After having our truck VIN run, I see on the list, JL4 CONTROL ACTIVE BRAKE ACTIVE BRAKE CONTROL(J...
Forum Discussion
That code is for an active stability system that can apply the brakes in certian situations automatically to increase stability. It has nothing to do with you aftermarket trailer brake controller.
