Troubleshooting Aggressive Braking and Only Red Light on Pro Series Pilot Trailer Brake Controller
Updated 10/22/2025 | Published 04/03/2025
Products Featured in This Question
Question:
My Reese brake control only lights up red dot when braking with trailer hooked up. Also trailer is braking very aggressive...I turned the gain down and I didnt help...any suggestions?
asked by: Matt W
Expert Reply:
Hi Matt; is this the Pro Series Pilot Trailer Brake Controller # 80550? Assuming it is, the red dot alone indicates that a trailer is not connected. You should also have a "c" on there with the trailer connected. That also probably means there is some kind of internal issue with the brake controller if the brakes are working even though it thinks a trailer isn't connected.
I would double check the connections on the brake controller, test the brake output circuit on the 7-way, make sure ground connections are secure, and inspect your connectors for corrosion or damage. If everything checks out it is likely the controller and replacing it would be your best option. If you go that route, I recommend upgrading to a more reliable, proportional brake controller like the Tekonsha Prodigy P3 # 90195.
(click to enlarge)
Product Page this Question was Asked From
Pro Series Pilot Trailer Brake Controller - Up to 3 Axles - Time Delayed
- Trailer Brake Controller
- Time Delayed Controller
- Electric
- Plug-In
- Under-Dash Box
- Under-Dash
- Up to 3 Axles
- LED Display
- Single Trailer Only
- Pro Series
more information >
Featured Help Information
Instructions
Miscellaneous Media
Continue Researching
- Article: Brake Controller 7- and 4-Way Installation Kit (ETBC7)
- Q&A: How Does Curt TriFlex NEXT Brake Controller Mount
- Article: Brake Controller Installation: Starting from Scratch
- Q&A: What Size/Style Breakaway Cable Do I Need To Replace My Current Cable
- Article: Wiring Trailer Lights with a 7-Way Plug (It's Easier Than You Think)
- Article: How to Choose the Right Trailer Hitch Class
- Q&A: What Is An OEM Prep Package And How Do I Know If I Have It
- Article: Best Bike Racks for Electric Bikes
- Q&A: Method for removing and Installing Tang-Style Spindles Washers
- Q&A: What is the Difference Between a 4-Way and 7-Way Trailer Connector
- Q&A: Recommended Plug and Play Brake Controller for a 2020 Toyota Tundra
- Article: How to Raise Your Travel Trailer Height
- Q&A: Hitch Recommendation for a Ford E-450 Bus
- Article: Trailer Wiring Diagrams
Robin H.
10/22/2025
Hey Matt, how did things turn out with your brake controller after checking the wiring and connections? Knowing whether replacing it or adjusting the setup solved the aggressive braking could help others with the same issue.