Troubleshotting Curt Trailer Wiring Harness Not Fitting 2012 GMC Terrain
Updated 09/26/2025 | Published 04/28/2025
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Question:
I just installed my new trailer hitch and wiring harness. The hitch fit perfect as did the harness. My question is regarding the trailer light harness. I plugged it in as described but it doesnt work. This lead me to check fuses that are good. Am I missing something? Is there a master fuse? Since it didnt come with a hitch Im assuming the vehicle doesnt have a tow package but the wire harness in the back is in place. Can you help? Thanks Ed
asked by: Edmond K
Expert Reply:
Hey Edmond, the Curt trailer wiring kit part # C56210 that you have for your 2012 GMC Terrain would only fit if you have the factory tow package which it sounds like yours doesn't. What we know is that there are some OEM components needed to activate the tow package wiring that we unfortunately do not have access to. That said, what we can guarantee will work is the # 56094 which installs by plugging inline with the vehicle taillights. This is the for sure kit we can recommend that will work.
Product Page this Question was Asked From
Curt T-Connector Vehicle Wiring Harness for Factory Tow Package - 4-Pole Flat Trailer Connector
- Custom Fit Vehicle Wiring
- Trailer Hitch Wiring
- Vehicle End Connector
- No Converter
- Factory Tow Package
- 4 Flat
- Plug and Lead
- Plug-In
- Visible
- CURT
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Jameson C.
9/26/2025
Hey Ed, did you get a chance to try the Curt wiring kit that plugs inline with the taillights? I'm curious to know if it solved the issue for you, as it could help others facing a similar situation.