Does the Ram Integrated Trailer Brake Controller Work with Electric-Over-Hydraulic Brakes?
Yes. Ram’s integrated trailer brake module (ITBM) is built for both electric and electric-over-hydraulic (EOH) trailer brakes. The key is telling the truck which type you are towing. You select an EOH setting in the trailer brake menu, then set the gain for your load.
There is one caveat. Ram’s owner’s manual notes the module was designed and verified with electric brakes and newer EOH systems. Some older EOH systems may not be compatible.
How Electric-Over-Hydraulic Brakes Differ
An EOH setup works differently from standard electric brakes. Electric drum brakes use a magnet to apply the brake shoes. An EOH actuator uses an electric pump to pressurize brake fluid, which then applies hydraulic disc or drum brakes on the trailer. That is why the truck offers separate settings for each type.
How Do You Switch the Ram Trailer Brake Controller to Electric Over Hydraulic?
You choose the brake type in the instrument cluster’s Trailer Tow menu, then adjust the gain.
Selecting EOH in the Trailer Tow Menu
Ram’s owner’s manual lays out the sequence:
- Hook up the trailer and plug in the electrical connection. The cluster should show that a trailer is connected. If the module does not recognize the connection, trailer braking is not available.
- Use the arrow buttons on the steering wheel to scroll to Trailer Tow. Press the right arrow to enter it.
- Scroll to Trailer Brake Type and press the right arrow.
- Select Light EOH or Heavy EOH.
On trucks with a Uconnect touchscreen, trailer brake settings can also be managed through Uconnect. Menus differ by model year, so check the owner’s manual for your truck.
Setting the Gain
Use the + and – gain buttons on the trailer brake control to set brake output. Gain runs from 0, which means no trailer braking, up to 10 in 0.5 steps. Ram recommends this test:
- Find a dry, level, traffic-free area.
- Tow the trailer at 20–25 mph and slide the manual brake control lever all the way.
- If the trailer wheels lock up, lower the gain. If they turn freely, raise it.
- Repeat until the gain sits just below lockup. With a heavier trailer, lockup may not happen even at 10.
Reset the gain whenever the trailer load, truck load, road or weather changes.
The information in this article is general guidance and does not constitute a specific diagnostic or repair recommendation for any individual vehicle. Repair and maintenance decisions should be made in consultation with a certified technician based on the specific condition of your vehicle.
What Is the Difference Between Light EOH and Heavy EOH?
Ram’s trailer brake module offers four brake types. Two are for electric brakes and two are for EOH brakes. Ram bases its suggestion on trailer load, with 10,000 pounds as the dividing line.
| Brake Type Setting | Trailer Brakes | Suggested Trailer Load |
|---|---|---|
| Light Electric | Electric | Under 10,000 lb |
| Heavy Electric | Electric | Above 10,000 lb |
| Light EOH | Electric over hydraulic | Under 10,000 lb |
| Heavy EOH | Electric over hydraulic | Above 10,000 lb |
Ram treats this as a starting point. The best choice can change with how you like the brakes to feel, the condition of the trailer brakes and the road. Check your actuator manufacturer’s recommendations too.
Why Might a Ram Brake Controller Not Recognize an EOH Actuator?
Recognition comes first. Factory-integrated controllers will not send braking output until the truck shows the trailer as connected, according to Dexter’s EOH adapter instructions. If the truck cannot detect the actuator, the trailer has no working brakes from the truck.
Common Causes and Fixes
- Wrong brake type selected. If the menu is still on an electric setting, switch to Light EOH or Heavy EOH.
- Actuator compatibility. Ram notes some older EOH systems may not work with its module. Actuator makers offer compatibility adapters that install on the trailer. Dexter offers one for its electric/hydraulic actuators, but it notes an adapter does not guarantee a fix for every controller.
Dexter recommends checking any EOH actuator for proper function before you tow.
The information in this article is general guidance and does not constitute a specific diagnostic or repair recommendation for any individual vehicle. Repair and maintenance decisions should be made in consultation with a certified technician based on the specific condition of your vehicle.
Ram Towing Packages, Towing Capacity and Adding the Factory Brake Controller
Ram offers its integrated trailer brake controller from the factory and as a Mopar accessory kit.
Which Ram Trucks Have the Factory Controller?
| Truck | How the Controller Is Offered | What Comes With It |
|---|---|---|
| 2027 Ram 1500 | Optional on most trims through the Trailer-Tow Group | Integrated trailer brake controller, trailer tire-pressure monitoring, Trailer Reverse Steering Control, trailer light check and, on most trims, trailer tow mirrors |
| 2027 Ram 2500 and 3500 | Standard on every trim | Integrated trailer brake controller; trailer tire-pressure monitoring is available in a package |
| 2025–2026 Ram 1500 built without it | Mopar accessory kit, installed after purchase | Controller module, switch, wiring harness and installation instructions |
Ram 2500 Towing Capacity
The 2027 Ram 2500 tows up to 20,000 pounds with the available High-Output 6.7L Cummins Turbo Diesel I6, according to Ram.
Maximum towing and payload capacity figures are based on properly equipped vehicles and vary by configuration. Do not exceed any weight rating. See your owner’s manual and the vehicle’s door-jamb label for specific capacities.
Adding the Mopar Controller to a Ram 1500
Some trucks did not come with the controller. For those, Mopar sells an integrated trailer brake control module kit for 2025–2026 Ram 1500 trucks. Before you order, check three things:
Check the Connectors
Both 4-pin trailer brake module connectors must be under the left side of the steering column. Without them, the kit cannot be installed.
Match Your Screen
One kit fits trucks with the 8.4-inch or 12-inch Uconnect screen. Trucks with the 14.4-inch screen need a different kit, plus a separate part if they lack the auxiliary switches.
Plan for Dealer Programming
After installation, an authorized dealer must program sales code XHC. That enables the system through Uconnect.
On trucks with the 8.4-inch or 12-inch screen, the switch replaces the left-side trim piece on the factory auxiliary switch panel, so it keeps a factory look. To check fitment or order one, contact our parts department at (760) 513-6605 or browse our Mopar accessory brochures. You can also explore more Ram accessories for towing and hauling.
Get Help With Your Ram Trailer Brake Setup
Whether you are setting up an EOH trailer for work or a weekend trip, the right setup matters on every mile. Ram owners in Victorville, Hesperia and Apple Valley can visit Victorville Motors at 14617 Civic Dr, Victorville, CA 92394. Call our service department at (760) 493-7902 to schedule a visit, or reach our parts department at (760) 513-6605 with Mopar questions.
Common Questions About Ram Integrated Brake Controllers and EOH Towing
Can you use an aftermarket brake controller if your Ram did not come with the factory unit?
Ram notes an aftermarket controller may be available for trailers with air or EOH brakes. If your truck already has the factory module, do not remove it on your own. Ram warns that removal will cause errors and may damage the electrical system and electronic modules, so see an authorized dealer first. For 2025–2026 Ram 1500 trucks with the needed connectors, the Mopar kit is another option.
What happens if you run an EOH trailer on an electric setting?
Ram’s manual says the correct trailer brake type must be selected for the trailer you tow. It also warns that a trailer setup the module is not compatible with may reduce or completely remove trailer braking, which can lengthen stopping distances. Select Light EOH or Heavy EOH before you tow.
Do all Ram trim levels include the integrated trailer brake controller as standard equipment?
No. It depends on the model. On 2027 Ram 2500 and 3500 heavy-duty pickups, Ram lists the integrated trailer brake controller as standard on every trim. On the 2027 Ram 1500, it comes with the optional Trailer-Tow Group. Check your window sticker or ask our team.
Does an electric-over-hydraulic actuator need a breakaway battery on the trailer?
Yes. Dexter, for example, requires a breakaway switch and a battery rated at least 9 amp-hours for its electric/hydraulic actuators to meet federal requirements. The battery powers the actuator so the trailer brakes apply if the trailer separates from the truck. California law requires trailer power brakes to apply automatically on breakaway and hold the trailer for at least 15 minutes.
Disclaimers
Maximum towing and payload capacity figures are based on properly equipped vehicles and vary by configuration. Do not exceed any weight rating. See your owner’s manual and the vehicle’s door-jamb label for specific capacities.
The information in this article is general guidance and does not constitute a specific diagnostic or repair recommendation for any individual vehicle. Repair and maintenance decisions should be made in consultation with a certified technician based on the specific condition of your vehicle.
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