Jeep / Chrysler trailer harness

[shmo925]

Ran across something interesting today. my brother in law was trying to tow a uhaul trailer with his 2014 Jeep Grand Cherokee today. the factory wiring harness was not functioning. after trying several trailer and vehicle combos they determined it was a problem with the jeep and not the trailer.

i searched around a bit and came upon several sources that claim you have to take the vehicle into the dealer, and have them re-flash the computer to enable the factory wiring harness. while this sounds like the dumbest thing i ever heard, apparently its true for 2014-2016 jeep grand Cherokees. i do not know if it extends to other Chrysler vehicles.

i found a stock 2014 file in the tune repository, but was not able to find a parameter anywhere that would allow that feature to be enabled. possibly something to add to HPT in the future?

[SrtGin]

the vin has to be updated by accessing dealerconnect, adding trailer hitch sales code and then performing a vehicle reconfiguration, with witech.

[bjbonnette]

Super old thread but I wanted to check to see if the trailer harness can be activated with HPT before buying the credits for my 21 jeep grand cherokee.

[spoolboy]

No, HP cannot do that.

AlphaOBD and OBDJscan both would be likely to do it when paired with the right interface devide like an OBDLINK MX+.

2021 will need some sort of bypass or interface harness to get around security.