Troubleshooting Random Lights on Curt Spectrum Brake Controller
Updated 10/30/2025 | Published 02/11/2025
Question:
I have the curt spectrum controller, worked fine for over a year, then started to dimly light up random lights around the dial, now it is flashing green around the knob. All of this happens with no trailer hooked up. How do I correct this? It is very distracting and very bright during nighttime driving.
asked by: Riley
Expert Reply:
Hey Riley! Based on what you're describing with the random lights and flashing green it sounds like your Curt Spectrum # C51170 has an internal issue. Green flashing isn't even part of the troubleshooting guide and since you aren't hooked up to a trailer it wouldn't be ramping up green to try to calibrate. Since the brake controller has a limited lifetime warranty I would reach out to Curt to see if you can get a replacement.
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Product Page this Question was Asked From
Curt Spectrum Trailer Brake Controller - Dash Mounted Knob - Up to 4 Axles - Proportional
- Trailer Brake Controller
- Proportional Controller
- Electric
- Plug-In
- Dash-Mounted Knob
- Behind-Dash
- Up to 4 Axles
- Indicator Lights
- Multiple Trailers
- CURT
more information >
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on Trailer Brake Controller
Robin H.
10/30/2025
Hey Riley, were you able to get in touch with Curt about your Spectrum brake controller replacement? Knowing what they did to resolve the flashing lights could help others with the same issue.