Troubleshooting OC Error Message on Hayes Blackbird Trailer Brake Controller
Question:
Blinking OC I can get it to go away, then when I press the brake pedal, it comes back.
asked by: Abe
Expert Reply:
When the Hayes Blackbird Time-Delayed brake controller displays the error code OC this means that the controller senses that it has lost its electrical connection to the trailer's brake circuit.
This code could be caused by many things: trapped water, dirt or corrosion inside the vehicle socket or trailer plug, or it could be due to a loose physical connection at the 7-way or at the blue wire at the back of the controller. The blue wire carries the output signal from the controller to the trailer brake circuit so a check of all of the wiring for the brake circuit is the way to go.
Check for any foreign material in the Silverado's 7-way socket and also check the contact at the 5-o-clock position (please see the linked photo). Check for a bent or damaged pin or any signs of corrosion on the actual contact surface. Trace the brake circuit wire up as far forward as you can to see if you can find any loose connections or damaged wire.
Repeat the check on the trailer's 7-way plug. Sometimes corrosion will start on the inside of a connector where it can be really hard to spot. This can happen though so give the truck socket and trailer plug a real good inspection. If you do find any signs of corrosion you can try a spray-on electrical contact cleaner or simply replace the connectors.
If you are using a quick-connect adapter # HA81781-HBC that plugs in under the dash also check the condition of the contacts on both ends of that wiring adapter. You can also refer to the two linked articles for additional troubleshooting help.
Product Page this Question was Asked From
Custom Wiring Adapter for Hayes Brake Controllers - Dual Plug
- Accessories and Parts
- Trailer Brake Controller
- Wiring Adapter
- Plugs into Brake Controller
- Vehicle Specific
- Hayes
more information >
Continue Researching
- Q&A: Spindle Dimensions of a 3500 lb Axle
- Article: Testing Trailer Brake Magnets for Proper Function
- Article: How to Adjust Your Trailer Brakes | The Ultimate Guide
- Article: Brake Controller 7- and 4-Way Installation Kit (ETBC7)
- Q&A: Troubleshooting No Running Lights on Trailer but Turn Signals and Brake Lights Work
- Q&A: Troubleshooting a Tekonsha P3 Brake Controller and 3015-P Install, No Display
- Q&A: Will the Tekonsha Plug-In Wiring Adapter # 3015-P Work on a 2007 Chevrolet Avalanche
- Q&A: How to Install a Hayes Brake Controller on a 2000 Ford F-250
- Q&A: Replacement Panel for Powertek PDC1001
- Q&A: Replacement Lid for VE0108 Ventline Roof Vent on Trailer
- Article: How to Install a Brake Controller on Chevrolet / GMC 1999-2006 Pickups
- Article: RV Sway Control, Stabilization, and Suspension Enhancement
- Article: Snow Tire Chains Explained: How Tire Chains Work & When to Use Them
- Article: Aftermarket Brake Control Wiring for 07-13 GM Full-Size Truck with Factory-Integrated Brake Control