Curt Triflex Brake Controller Intermittent Error Code Trailer Not Connected
Updated 06/05/2019 | Published 06/04/2019
Question:
I have a 2013 GMC yukon Xl Denali and had a Curt triflex brake controller professionally installed at the GM dealer. I have hooked the RV trailer up to my neighbors truck with a brake controller and it operates just as it should. I hook it up to the Yukon and it works for a minute, then flashes dc, then releases and displays CC before going back to two dots every time I press the brake pedal. Each time all of the RV wheels completely lock up. I checked and cleaned all the connectors in the back, tested for power and everything seems to be fine. I checked the grounds on the trailer again and everything is fine, especially after testing it on the neighbors truck. It leads me to believe its in the Yukon. What else may be causing this?
asked by: Colin D
Expert Reply:
You are correct in your thinking that the problem is not the trailer since the brakes work properly when hooked up to the neighbor's truck. The issue is most likely the ground on the trailer connector on the Yukon or the Curt Triflex itself part # C24VV. It sounds like you have checked your connections and grounds but it is a good idea to make sure the trailer connector on the Yukon is grounded to clean bare metal surface and that the brake controller itself is grounded properly. The brake controller is intermittently not recognizing the trailer is connected since it goes from disconnected to calibrating and then standby mode which could mean the ground is not sufficient enough. You said you have power to the pins on the trailer connector so that is good. I have also been told by Curt that sometimes unplugging the controller and resetting it helps with issues like what you are having.
The next step is too check the wires from the back of the brake controller to make sure they are not loose. I am not sure how long you have been having this issue but the installer may have incorrectly hardwired the red wire to the cold side of the stop light switch. You want to make sure all connections are good there. The last step is too test the blue wire from the back of the brake controller by severing it about 6 inches back from the brake controller and testing it with a circuit tester while you hit the manual override on the Triflex. Also test it while you press the brake pedal. If you have full voltage there (light on circuit tester is bright) then the brake output wire from the brake controller is okay and the issue is with the wiring and I would take it back to the installer (if it's a new install).
If you have no power or intermittent power at the blue wire then the brake controller is defective and probably needs to be replaced.
Product Page this Question was Asked From
Curt TriFlex NEXT Trailer Brake Controller - 1 to 4 Axles - Proportional
- Trailer Brake Controller
- Proportional Controller
- Electric
- Plug-In
- Under-Dash Box
- Under-Dash
- Up to 4 Axles
- LCD Display
- Single Trailer Only
- CURT
more information >
Featured Help Information
Instructions
Continue Researching
- Shop: Brake Controller
- Q&A: What Size Hole Saw do I Need to Make the Hole in the Bed of My Truck to Install B&W Gooseneck Hitch?
- Shop: Gooseneck Hitch
- Video: Gooseneck Trailer Hitch Installation - 2004 Dodge Ram Pickup
- Video: Gooseneck Trailer Hitch Installation - 2005 Dodge Ram Pickup
- Video: What to Know About the Curt TriFlex NEXT Trailer Brake Controller
- Shop: Curt Venturer NEXT Trailer Brake Controller w/ Plug-In Harness - Up to 3 Axles - Time Delayed
- Shop: Trailer Wiring
- Shop: B&W Turnoverball Underbed Gooseneck Trailer Hitch w/ Custom Installation Kit - 30,000 lbs
- Shop: Curt TriFlex NEXT Trailer Brake Controller w/ Custom Harness - 1 to 4 Axles - Proportional
- Video: Feature Breakdown: Curt 5th Wheel/Gooseneck Custom Wiring Harness w/ 7-Pole Connector
- Shop: Curt Spectrum Brake Controller w/Universal Harness - Dash Mounted Knob - 1 to 4 Axles - Proportional
- Shop: Curt TriFlex NEXT Trailer Brake Controller w/ Plug-In Harness - 1 to 4 Axles - Proportional
- Shop: Curt 5th Wheel/Gooseneck Custom Wiring Harness w/ 7-Pole Connector - 7' Long
- Shop: Curt T-Connector Vehicle Wiring Harness for Factory Tow Package - 7-Way Trailer Connector
- Q&A: What is the Difference Between a Class II and a Class III Hitch?
- Video: Firestone Ride-Rite Air Bags with Easy Mount Compressor Feature Breakdown
- Shop: Trailer Hitch
- Article: Trailer Wiring Diagrams
- Search Results: trailer hitch
- Search Results: trailer wiring
- Article: Brake Controller 7- and 4-Way Installation Kit (ETBC7)
- Q&A: What is the Difference Between a 4-Way and 7-Way Trailer Connector
- Article: How to Measure for Trailer Hitch Drop
- Search Results: trailer tires and wheels
- Shop: Suspension Enhancement
- Q&A: How to Replace a Lance 6-Pin Plug w/ a Standard 7-Way Connector
- Article: Wiring Trailer Lights with a 7-Way Plug (It's Easier Than You Think)
- Search Results: brake controller
- Video: How to Choose a Trailer Brake Controller
on Trailer Brake Controller
