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brake controller unit

beachlovingmom
Explorer
Explorer
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(JL4)

A. When we first got the truck, we had a mechanic add a Pilot brake controlling unit. Does that mean the truck now has 2??

B. If it has 2, does one interfere with the other?

Thanks for your help. I am trying to work out all bugs before a long trip.
1 REPLY 1

adayjk
Explorer
Explorer
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.