Troubleshooting Hayes Engage Brake Controller Showing BF Error Code

Question

Question:

I have a hayes engage trailer brake controller 1-3 axles time delayed. Part number ha81760. It keeps saying bf code. Dont know what that means. Dont have the instructions anymore. Ive been scratching my head on this. Thanks

asked by: Darrick H

0

Expert Reply:

According to the operating instructions (I'll email you a copy) the bF error code indicates that there's a short somewhere in the brake output circuit, which is the blue wire that exits the rear of the controller and delivers the voltage to the trailer brakes through the trailer connector.

Several things might be causing this. The first thing you will want to do is sever the blue wire from a few inches behind the brake controller. Leave enough wire so you can reconnect it later. Then use a circuit tester like # PTW2993 on the side coming out of the controller. It should show power only when you apply the manual override. If it doesn't or if it shows power at any other time, then the controller is faulty and should be replaced.

If the controller tested out okay, reconnect the blue wire. Next you can check the trailer and vehicle side connectors. A dirty, damaged or corroded trailer connector can cause a short. Clean out any dirt or corrosion you find. Corrosion can also build up in the backs of the connectors where the wires connect.

Next check the trailer wiring to the brake magnets. You will be looking for any nicks in the wiring that show exposed wire touching the trailer frame. Also check to make sure the trailer magnet ground and power wires are connected securely. Each magnet's ground connection should be securely made to clean uncorroded metal.

Then inspect the magnets themselves. You'll need to pull the hubs to inspect them. If you can see the copper windings coming through the face of the magnets they will need to be replaced.

I'll link you to an FAQ article about troubleshooting brake controllers.

expert reply by: Mike L

0

Answer 1

With the Hayes Engage Trailer Brake Controller #HA81760 the code OC indicates that the controller does not sense an electrical connection to the trailer brakes, or that the trailer has electric-over-hydraulic brakes which do not work with this unit.…

view full answer...

Answer 2

Since you did not mention the particular brake controller that you have, I am going to give you some general brake controller information that might help you solve the problem. I am including a link to a FAQ page on troubleshooting a brake…

view full answer...

Answer 3

You do not have to have your trailer connected to your vehicle when testing the brake controller. Also, when testing the brake controller make sure that the gain is adjusted high enough to give a correct brake signal. You are correct in that you will…

view full answer...

Answer 4

A 4-Way trailer connector has the basic lighting functions only; running lights, left turn signal and brake lights, right turn signal and brake lights, and ground. A 7-Way has these functions and a 12 volt circuit, a circuit for electric trailer…

view full answer...

Answer 5

The difference between the Class II and Class III hitches has to do with their Gross Trailer Weight (GTW), their Tongue Weight (TW), and their Hitch Receiver Size. Class II trailer hitch receivers have a 1-1/4 inch receiver and can be rated up to…

view full answer...

Answer 6

If you just need a 4-pin to 7-pin trailer wiring adapter, then you can use part #C57672. This will plug into the 4-pin trailer connector on your brother's vehicle and give him the 7-pin socket for the trailer. Keep in mind, this will only give…

view full answer...

Answer 7

If you have a vehicle specific wiring harness for a brake controller then that would indicate that you have a factory tow package and subsequently would already have a 7-way at the back of your vehicle. The universal 7-way connector #ETBC7 is meant…

view full answer...

Answer 8

The Redarc Tow-Pro Liberty #RED24FR is the way to go over the Elite #RED44FR as you get the nicer functions of the Elite at a lower price. The Elite has the ability to be the more preferred proportional style of controller as well as a time-delayed…

view full answer...

Answer 9

You do have the option to utilize the air brakes on your 2023 Freightliner Cascadia to control electric trailer brakes using the Hayes Air Actuated Trailer Brake Controller, part #HA100400C. However, we mostly recommend just using an electric brake…

view full answer...

Answer 10

Hey Antoine, so the two kits you mentioned are actually really similar and honestly I would go with the part #ETBC7 if I were you. The #ETBC7L is basically the same thing minus a couple wires and breakers so you may as well get the kit that has…

view full answer...

Answer 11

You're right, the mounting bracket is unique (in a good way) for the Curt TriFlex NEXT Trailer Brake Controller #C24VV. The bracket is smaller and all you do is put the included adhesive tape on the bracket and stick it wherever you like under…

view full answer...

Answer 12

A factory 7-way trailer connector isn't all you need to power a trailer's electric brakes. You still need a brake controller. Some Ford F-150s are equipped with a factory integrated brake controller, which you may have. If your 2012 Ford…

view full answer...