Curt Spectrum - What Do Two Flashing Blue Lights Mean?

Updated 12/12/2024 | Published 12/09/2024

Question:

My controller flashes tow blue lights then green spectrum lights while in tow. All lights and brakes work as should.

asked by: Trent D

Expert Reply:

Hello Trent, thanks for getting in touch. The two blue lights on the Curt Spectrum # C51170 knob mean the trailer is disconnected. The lights should flash blue when the trailer is disconnected or they will be steady blue with the brakes are pressed with no trailer connected. The green lights when towing are also normal. The knob will show green/red depending on your braking power setting. I have included the list of the LED color patterns for the knob below. If there is an issue you are having or if something is wrong with your controller just let me know and I am happy to help troubleshoot.

expert reply by: Jesse M

Curt Spectrum LED Codes
(click to enlarge)

Trent

12/9/2024

I'm not touching brakes when this is going on. The green light flashes 2 r 3 times then it starts process again. One flash of two blue lights and then the green lights ramping flash at least 2 maybe 3x's

Jesse M.

12/12/2024

@Trent There are a few things that could be causing this. The most common cause would be rust or corrosion on your trailer connector that is disrupting the signal. Sounds like the controller is disconnecting then trying to recalibrate. It is either a dirty trailer plug or possibly a wiring issue that is disrupting power to the controller.