A trailer brake is a system installed in a vehicle to control the speed and stopping of the trailer. When reducing speed, it is mounted on the driver’s side dashboard and activates proportionally to the vehicle’s brake or at a time-delayed frequency.
The “Service Trailer Brake System” message indicates that the trailer brake system has disengaged due to wiring issues or other problems. The warning may make it difficult to stop the trailer and may cause odd noises when braking.
While it is technically possible to drive with the warning message on, it is not recommended or safe to do so.
When depressed, the brake pedal engages the trailer service brakes, allowing the driver to use them independently from the towing vehicle’s brakes.
If the dashboard shows a “Service Trailer Brake System” message, it indicates an issue with the trailer brake’s wiring, disrupting the power supply between the truck and trailer.
What Is a Trailer Brake?
A vehicle’s trailer brake controller system is an OEM or aftermarket module. This device is installed on the vehicle to help the driver regulate the speed level of the trailer.
As well as the stopping. The device is mounted on the dashboard at the driver’s side of the tow vehicle.
The trailer brake controller system engages in direct proportion to the tow vehicle’s brake. Or, it may also engage at a time-delayed frequency when reducing speed to stop. Most vehicle trailer brake systems are fitted with a plus/minus adjustment gain.
A few examples of trailers that are fitted with a trailer brake system include the following; horse trailers, large boat trailers, travel trailers, enclosed trailers, etc.
What Does Service Trailer Brake System Warning Light Mean?
The service trailer brake system’s error message is a warning signal. That reveals a disengagement of a trailer from the towing vehicle, such that it can no longer receive power from the vehicle to function.
So, if you’re wondering, “What does a service trailer brake system mean?” It is a sign that there’s a problem with the trailer brake wiring.
Or, the problem might be with the module that hinders the power supply from the tow truck to the trailer. When this occurs, it will manifest a couple of other symptoms besides the error message.
Some of the signs include a delay in the process of stopping the trailer, a sharp noise from the brake, a sinking pedal, and a sudden unresponsive or mushy feeling when you engage the trailer brake.
You may face any challenges outlined above or at least see the service trailer brake controller error message. In this case, reset the trailer brake ASAP before it escalates into an unexpected accident or damage.
Types of Trailer Brakes
There are two types of trailer brakes:
(A). Surge brakes.
These brakes are a component of a self-contained hydraulic braking system. It relies on the trailer’s weight and momentum for proper functioning.
Thus, surge brakes won’t require anything electrical to function. However, the driver’s poor control of surge brakes is one of their main drawbacks.
(B). Electric Brakes.
These brakes will operate the electromagnetic brake drums by drawing electricity from the towing vehicle. The electric brake system is programmable and gives freedom to the driver to activate the brakes as per need.
Trailer Brake System Components
To understand how to reset your trailer’s brake system, it’s important to know about its main parts. In this section, we’ll explain the key components that make up a trailer brake system.
#1. Brake controller.
The brake controller is a small device inside the tow vehicle that controls the trailer’s brakes. It sends the right amount of power to the brakes so they work properly when you need to slow down or stop.
#2. Brake lines and hoses.
Brake lines and hoses carry brake fluid from the brake controller to the trailer’s wheels. The fluid helps to apply pressure to the brakes, making them work when you step on the brake pedal.
#3. Brake assemblies.
Each wheel on your trailer has a brake assembly, which includes brake pads, rotors, and other parts. These components work together to create friction, slowing down or stopping the trailer when you apply the brakes.
#4. Brake magnets and sensors.
Brake magnets are part of the brake assembly and help activate the brakes when needed. Sensors in the brake system monitor the brakes’ performance and send information to the brake controller, ensuring everything works correctly.
#5. Trailer connectors and wiring.
Trailer connectors and wiring allow the tow vehicle and the trailer to communicate. They send signals from the brake controller to the trailer’s brakes, as well as information from the sensors back to the controller.
causes of Trailer Brake System
The Service trailer Brake system is an essential component. These are the major causes behind the service trailer brake controller message on your dashboard.
#1. Poor Trailer Brake Control Button.
A trailer brake controller is usually beneath the dashboard in most cars. However, the trailer brake control button may fail. The most common cause can be carbon build-up at the terminals.
If you have a Ford with the Service Trailer Brake System, you will find it more often. The best practice is to clean the terminals.
#2. Blown Fuse.
It is a major symptom of a failing trailer brake system. Every electrical part of your car runs with the assistance of a fuse. The fuse helps to prevent the excessive flow of voltage.
So, whenever there is an excessive flow of power supply, the fuse will blow to prevent the electrical part. So, when there is a flashing error message on your dashboard, then the blown fuse of the trailer brake system can be the culprit.
#3. Defective Brake Light Button.
The warning light flashes if the brake light switch malfunctions. However, it is typically inexpensive to replace this component. In most car types, the brake light switch is on the brake pedal, and changing it yourself is also easy.
#4. Faulty Master Cylinder.
A master cylinder and a few sensors are used in the brake system to make sure everything is working properly.
However, when the trailer brake system warning sign flashes, along with other signals, it could be the reason. You could have to pay a higher repair fee depending on the damage.
#5. Faulty Wiring.
Another common reason for a defective trailer brake system is a faulty trailer wiring harness. It could be due to the fraying of the wire.
Troubleshooting Service Trailer Brake System
Identifying the root cause of the problem requires a systematic approach. Here are the steps you can follow to troubleshoot the issue:
#1. Inspect the Trailer Connection.
- Check the Wiring Harness: Inspect the wiring harness and connectors for any visible signs of damage, corrosion, or loose connections. Make sure all the plugs are securely connected.
- Check for Proper Grounding: Ensure that both the vehicle and trailer have good ground connections. A poor ground can cause intermittent operation of the trailer brake system.
#2. Inspect the Fuses and Relays.
- Check the Fuses: Refer to the vehicle’s owner manual to locate the fuse for the trailer brake system. If the fuse is blown, replace it and see if the issue resolves.
- Check the Relays: A faulty relay can disrupt the signal to the trailer brakes. Inspect the relays and replace any that appear to be malfunctioning.
#3. Test the Brake Controller.
- Controller Self-Diagnosis: Most modern brake controllers have a self-diagnosis feature. Follow the manufacturer’s instructions to run a self-test on the brake controller.
- Use a Multimeter: Test the output voltage at the brake controller with a multimeter to ensure it’s sending the correct signal.
#4. Inspect the Trailer Brakes.
- Check Brake Components: Inspect the trailer’s brake shoes, drums, and other components for wear or damage. Replace any parts that are worn out or damaged.
- Test the Trailer Brakes: If possible, use a test light or brake tester to ensure the trailer brakes are receiving power and functioning correctly.
#5. Update the Vehicle’s Software.
- Check for Software Updates: Sometimes, a software update from the vehicle manufacturer can resolve issues related to the trailer brake system. Contact the dealer to see if any updates are available.
Is It Safe to Drive With Service Trailer Brake System Error?
You can possibly drive a vehicle with the service trailer brake error message. However, you must avoid towing any load until you finally fix the problem. Failure to fix the issue can damage your brake in the long run and lead to unexpected accidents.
Therefore, while it is possible to drive with a trailer brake controller error message, it is not safe or ideal to do so. Safety must be 100% at all times. So, the fact that a vehicle moves irrespective of a fault does not mean all is well.
A slight error can cause severe damage or an accident when you least expect it. So, it is best to fix any fault you spot in your vehicle until you are sure that the problem is no more.
How much does it cost to fix the service trailer brake system?
You could spend anywhere from $0 to $500 to fix the trailer brake system, depending on what’s wrong with it.
If an adjustment is all that’s needed, you only need to give up a little bit of time and use your screwdriver. However, there are other situations that are going to cost you money to repair.
As an example, if you need a new fuse, you might spend $5 to $15. Again, this is something you can probably repair on your own. It should only take you a few minutes once you find the fuse.
Other than these two problems, you might need the trailer brake system parts replaced, or it might be time for a complete replacement. The cost of this replacement depends on multiple factors.
First, you will spend more on OEM equipment versus parts that are aftermarket. Additionally.
You have to consider what make and model you drive, as some are remarkably more expensive to work with. You also have to think about where you are getting the work done.
How to Prevent the “Service Trailer Brake System” Message
Prevention is better than cure. Here are some tips to prevent the “Service Trailer Brake System” message from appearing:
(A). Regular Maintenance.
- Inspect Wiring and Connections Regularly: Check the wiring harness, connectors, and plugs for damage and corrosion regularly. Apply dielectric grease to prevent corrosion.
- Service Trailer Brakes: Regularly inspect and service the trailer brakes, including shoes, drums, and magnets, to ensure they are in good condition.
(B). Proper Storage.
- Protect the Wiring: If the trailer is stored outside, cover the connectors and wiring to protect them from the elements. This will prevent corrosion and damage.
- Disconnect Battery: If the trailer is not used for extended periods, disconnect the battery to prevent electrical issues.
(C). Use Quality Components.
- Invest in Quality Wiring and Connectors: Use high-quality wiring and connectors that are rated for your trailer’s requirements. Avoid cheap components that may fail under load.
- Choose a Reliable Brake Controller: Invest in a good-quality brake controller that is compatible with your vehicle and trailer.
When to Seek Professional Help
If you’ve tried the above troubleshooting steps and the issue persists, it’s time to consult a professional. A certified technician can use specialized tools to diagnose the problem more accurately. It’s particularly important to seek professional help if:
- The message persists even after replacing damaged components.
- You’re unsure about performing the necessary repairs yourself.
- The issue appears to be complex or related to the vehicle’s computer system.
FAQs.
Q: Why does my GMC say service trailer brake system?
If you’re getting a service trailer brake system error signal from your GMC Sierra, you most likely have a faulty ITBC–integrated trailer brake controller wiring or module.
Usually, when the GMC service trailer brake system error message displays, it reveals a malfunction that hinders the power supply from reaching the system for proper functioning.
Therefore, the warning message reveals that the ITBC system cannot perform its normal operations due to the disconnection from power.
This is a safety concern; hence, it would be best to contact a professional auto technician to check out the exact problem and fix it as soon as possible.
Q: How do you reset a trailer brake controller?
Resetting your truck’s trailer brake controller is pretty straightforward. It will help you turn off the service trailer brake system error message ASAP.
So, firstly, ensure to get a flathead screwdriver, a piece of rock or wood, a strong hammer, and a helping hand (a friend to assist). Once you have these tools, locate the trailer’s adjusting nut. It is usually found close to the axle behind the trailer brake.
After that, loosen the locknut, which secures the trailer brake’s adjusting nut by using the flathead screwdriver. Now, turn that adjusting nut in a clockwise direction until it finally snugs against the backing plate. Once you do this, you’re good to go!
Q: What are service brakes on a trailer?
The service trailer brake system in a 2014 Silverado is fitted to the trailer. Thus, it enables the driver of the towing vehicle to easily regulate the effort of the trailer brake. It is specifically designed for a smooth driving experience while towing a load.
The trailer brake system is highly susceptible to corrosion, seizure, binding, wire deterioration, etc. These are major factors that affect the braking system, especially when you ignore them for a long period.
Q: How do I turn the service brake assist off?
Firstly, there are no specific ways to turn off a vehicle’s service brake assist as they are factory-fitted. Manufacturers ensure to keep them active because of the safety role they play, especially in the face of an unexpected accident.
However, disconnecting the fuse that controls the brake assist system is the only solution in this case.
Meanwhile, disengaging this component and turning off the brake assist system will require you to take full responsibility for your safety, so it would be best to learn about the brake assist system’s operation in order to properly maximize it.
Q: Is there a fuse for trailer brakes?
Of course, most trailer brakes come with a 30-amp fuse. The fuse is located in the engine compartment right in the vehicle’s underhood. Fuses work perfectly when they receive a voltage level that is commensurate with their capacity.
Fuses are installed to protect the actual components that they connect to in a vehicle. It is essential to engage in regular maintenance to avoid unnecessary wear and tear on the trailer brake system.
Replacing the trailer brake is an expense you don’t want to incur, especially when the component has not reached its lifespan. Hence, you must manage the component carefully.
Final Words
Just like the importance of safety cannot be overemphasized, you cannot be too safety conscious about the service trailer brake system in a 2017 Silverado.
Not to undermine at all, maintaining a 100 percent safety consciousness is extremely vital for you and your vehicle.
So, you must ensure that your vehicle’s service trailer brake controller is in perfect condition at all times.
However, if you’re already seeing the service trailer brake controller error in your truck, do not panic; kindly drive straight to a professional auto technician’s workshop to fix the problem.
Meanwhile, if you’re a DIYer, take a moment to follow the guidelines on how to reset your vehicle’s trailer brake above.