If your Silverado features the integrated trailer brake controller (ITBC) and is
showing service trailer brake system error messages, resetting them yourself can
save a considerable amount of money as dealers typically charge much higher fees.
When there is an open circuit or high resistance in Circuit 47/Trailer Brake Output
Circuit during ignition cycles, the ITBC will display either “CHECK TRAILER WIRING or
SERVICE TRAILER BRAKE SYSTEM” on its digital indicator display (DIC).
CHECK TRAILER WIRING
A trailer brake controller is a device installed onto your truck or SUV to allow for
controlling of trailer brakes. Unfortunately, these controllers are often vulnerable to
corrosion, binding, power loss and more – so if yours seems odd or light is
illuminated it is wise to contact a professional immediately so they can address this
problem and fix it for you.
Poor connections at 7-way connectors can also trigger messages to appear on your
DIC screen, since trailer side connector plugs tend to become deformed over time
and lose terminal tension, thus cutting power flow to your trailer, leading to its
brakes not functioning and setting off warning lights on its trailer side.
Resetting the service trailer brake system error code on your Silverado is relatively
straightforward. Simply use a flathead screwdriver and a piece of solid wood or stone as tools.
CHECK TRAILER BRAKES
Your trailer brakes could become inoperable for various reasons, including loss of
power, sinking pedal and delays when applying brakes. To keep them functioning
optimally, maintain regular routine maintenance including inspecting and updating
your trailer brake controller and getting it professionally checked for signs of wear or damage.
A common cause for the service trailer brakes message to appear is due to a blown
fuse. A fuse is an electrical component which regulates how much power reaches a
particular electronic system or piece of equipment; if a fuse blows, this means it no
longer receives enough to function as intended and therefore won’t function correctly.
Repairing a blown fuse can be both inexpensive and straightforward; all it requires is
a flathead screwdriver, some rocks or wood pieces, a strong hammer and possibly someone to assist you.
CHECK TRAILER BRAKE CONTROLLER
If you own a trailer, then you understand the significance of keeping its brake
system functioning effectively. This requires not only maintaining good brake
condition but also making sure your trailer brake controller works as intended. If an
alert such as “Service Trailer Brake Controller” appears on your dashboard,
immediate steps should be taken to address it.
By conducting a multimeter test between the trailer and truck, it will allow you to
ascertain if there is an internal short in circuit 47/trailer brake output circuit.
Dependent upon the type of trailer you own, it may also be necessary to check its RT
or LT fuse. These fuses can usually be found either within the power distribution
center or beneath the hood of the vehicle and should be replaced if they stop
functioning as expected; doing so may solve issues with service trailer brake light display on dashboard.
CHECK ENGINE
Your Silverado’s trailer brake system is an integral component of its safety. This
braking system works by accepting electronic signals from the truck when the brake
pedal is depressed, then activating trailer brakes to help slow down load speeds.
Unfortunately, however, its integrity can become compromised due to corrosion,
seizure or binding; and may then malfunction and trigger an alert that service brake
system message be issued.
Faulty fuses can also trigger the service brake system error message, as these
control the flow of power for every electronic component in your vehicle and can
usually be found within its power distribution center (also referred to as “fuse box”).
Dependent upon the issue at hand, depending on its nature you may need to
disconnect the 7 way trailer connector or replace its trailer BRAKE control module. If
these steps fail to address it further a GM dealer may be able to diagnose and repair
it at your cost; repairs will incur extra charges for repair work done there.