Mechanic Wiki: How to Put Hyundai Tucson into EPB Service Mode (2020+)

Learn the step-by-step button sequence to activate EPB Service Mode on your Hyundai Tucson for safe rear brake pad and rotor replacement. Includes troubleshooting and alternative methods.

Last Updated: June 28, 2026

Quick Answer

To put a Hyundai Tucson into EPB (Electronic Parking Brake) Service Mode, you enter a specific button sequence: with the ignition ON (engine off), quickly press the brake pedal twice, then press and hold the EPB switch to "Release" for 3 seconds, followed by "Apply" for 3 seconds. The dashboard confirms with "EPB Service Mode Activated." This disengages the rear calipers mechanically so you can safely replace brake pads or rotors without damaging the parking brake motor.

Why You Need EPB Service Mode

If you own a Hyundai Tucson with an electronic parking brake—that small button on the center console instead of a foot pedal or hand lever—you cannot simply pry the rear caliper pistons back when changing brakes. The EPB system uses an electric motor built into each rear caliper to apply the parking brake. Without putting the system into a special diagnostic state, forcing the piston back can strip the motor’s internal gears, trigger expensive error codes, or even lock up the caliper entirely.

What Is EPB Service Mode?

EPB Service Mode is a diagnostic state that retracts the rear caliper pistons fully and disables the automatic apply function. Think of it as telling the car, “I’m about to work on the rear brakes, please step aside.” Once activated, the parking brake motor is electrically isolated, allowing you to compress the piston with a normal brake tool. The mode also prevents the car from accidentally re-applying the parking brake while you're working on the assembly.

When Should You Use It?

You need EPB Service Mode anytime you perform rear brake service on a Tucson equipped with an electronic parking brake. Common scenarios include:

Replacing rear brake pads or rotors
Cleaning and lubricating caliper slide pins
Performing wheel bearing or suspension work near the rear brakes
Diagnosing EPB-related warning lights or error codes

Attempting any of these tasks without first activating service mode risks mechanical damage and electrical faults.

Pre-Requisites and Safety Warnings

Before diving into the procedure, gather the right tools and take proper precautions. The EPB system is sensitive to voltage drops and incorrect sequences.

Tools Needed

OBD2 scanner with EPB service function (optional but strongly recommended for troubleshooting)
12V battery maintainer or trickle charger (prevents voltage sag during the procedure)
Basic socket set, jack stands, and wheel chocks
Torque wrench for caliper bolts (typically 25–35 lb-ft, but check your model's specs)
Brake piston rewind tool (not a C-clamp—this is critical)

Safety First

Always chock the front wheels securely and use jack stands rated for your Tucson’s weight. Never rely on the jack alone.
Work on a flat, stable surface. If the vehicle moves, you risk injury.
Disconnect the 12V battery after entering service mode if you plan to leave the car unattended. However, keep the battery connected while performing the activation steps—many modules need power.
Do not force the caliper piston without confirming the service mode is active. A stuck piston that fights back likely means the EPB motor is still engaged.

Step-by-Step Procedure (2020+ Hyundai Tucson)

This method works for the fourth-generation Hyundai Tucson (NX4) built from 2020 onward. The sequence is consistent across most trims, including the Hybrid and Plug-in Hybrid versions.

Step 1: Prepare the Vehicle

Park on level ground with the transmission in Park (automatic) or Neutral (manual). Turn the ignition completely OFF. Remove the smart key from the cabin or keep it at least 10 feet away to prevent the car from detecting it during the sequence.

Step 2: Enter Diagnostic Mode

Press the Start button twice without touching the brake pedal. This turns the ignition ON but keeps the engine off. All dashboard warning lights should illuminate and then settle.

Within 5 seconds, press and release the brake pedal twice quickly (like a double-tap). Immediately after the second press, press and hold the EPB switch in the "Release" (downward) direction for a full 3 seconds. You should hear a faint clicking sound from the rear calipers.

Step 3: Confirm Activation

Release the EPB switch, then immediately press and hold it in the "Apply" (upward) direction for 3 seconds. Watch the dashboard. A message should appear: "EPB Service Mode Activated" or a blinking EPB warning light indicates success.

If nothing happens, the timing was off. Repeat Steps 2 and 3 more slowly—some Tucons need a deliberate 1-2-3 count for each hold.

Step 4: Verify Release

Before removing the calipers, try spinning each rear wheel by hand. They should rotate freely without any drag. If you feel resistance, the EPB pistons have not fully retracted. Do not proceed until the wheels spin smoothly—forcing them can damage the rotor or pads.

Step 5: Perform Brake Service

Now you can safely remove the rear calipers. Use a brake piston rewind tool (not a C-clamp) to push the pistons back into the caliper bodies. The service mode keeps the EPB motor disengaged, so the pistons should move easily.

Replace the pads and rotors as usual. Torque the caliper bolts to factory specs (consult your owner's manual or a repair database). Reinstall the wheels.

Step 6: Exit Service Mode

Turn the ignition OFF, then turn it ON again (engine still off). Press the brake pedal once. Press and hold the EPB switch in the "Apply" direction for 5 seconds. The dashboard should display "EPB Service Mode Deactivated" and the parking brake will re-engage—you’ll hear the rear calipers click.

Test the EPB by applying and releasing it two or three times. If the brake holds and releases normally, you’re done.

Alternative Methods (2018–2019 Models)

If you own a 2018 or 2019 Hyundai Tucson (third generation, TLE), the button sequence may not work. These models sometimes require different methods.

Using the Infotainment Menu

Some earlier Tucson models allow service mode activation through the touchscreen:

Start the engine and put the car in Park.
Go to Settings > Vehicle > Brake > Electronic Parking Brake Service Mode.
Follow the on-screen prompts. The system will retract the calipers automatically.

This method is straightforward but only available on trims with the larger infotainment screen.

OBD2 Scanner Method

For any Tucson—especially if the button sequence fails or you prefer a guided interface—an OBD2 scanner with EPB service capability is a lifesaver. Tools like the Autel MaxiCOM, Launch X431, or even affordable units like the Foxwell NT530 can activate service mode under a "Brake Service" or "EPB Reset" menu. Simply plug the scanner into the DLC (under the dashboard, driver’s side), follow the prompts, and the car will retract the calipers. This method also works on models that don’t have the infotainment menu option.

Troubleshooting Common Issues

Even with the correct procedure, things can go wrong. Here’s how to handle the most frequent problems.

Dashboard Does Not Show Service Mode

Cause: The timing of the brake pedal and EPB switch sequence is off, or the ignition was not ON.

Fix: Turn the ignition OFF, wait 30 seconds, then repeat the steps with precise timing. Ensure the dash lights are on but the engine is not running. If you have a smart key, keep it away from the door sensors to avoid triggering the car’s “welcome” sequence, which can reset the procedure.

Rear Wheels Still Locked After Activation

Cause: The EPB motor may be mechanically stuck, or a caliper is seized.

Fix: Check fuse #21 (EPB module) in the underhood fuse box. If the fuse is blown, replace it and retry. If the fuse is good, use an OBD2 scanner to force a release. If the wheels still won’t turn, the caliper itself may need replacement—do not force the piston.

Error Codes After Service

You might see codes like C1513 (EPB motor circuit fault) or C1122 (EPB switch malfunction). These often appear because battery voltage dropped during the procedure. A battery maintainer prevents this. Clear the codes with a scanner after successful exit. If they return, inspect the EPB wiring and connectors for damage.

Vehicle Won’t Exit Service Mode

Cause: The exit sequence was interrupted or incomplete.

Fix: Turn the ignition OFF, wait one minute, then turn it ON and press the brake pedal once. Hold the EPB switch in Apply for a full 5 seconds. If that fails, disconnect the negative battery terminal for 10 minutes. This resets the EPB control module. Reconnect and re-enter service mode, then exit properly.

What to Expect After Service Mode

Once you exit service mode and re-engage the parking brake, the system may need a moment to recalibrate. The first few times you apply the EPB, it might sound different or take slightly longer—that’s normal.

Brake pedal feel: Pump the brake pedal 5–10 times with the engine off to reset the caliper pistons and pedal height. Start the engine, then pump a few more times. The pedal should feel firm.
Test drive: Drive gently for a few miles, listening for rubbing or grinding from the rear. If you hear noise, the pads may not be seated correctly, or the EPB may not have fully released. Re-enter service mode, verify release, and reinstall.
EPB auto-apply: The parking brake should automatically engage when you turn the ignition OFF. If it doesn’t, check for error codes.

For the smoothest operation, perform an EPB adaptation using a professional scanner. This recalibrates the system’s internal position sensors and is recommended after any rear brake service.

Frequently Asked Questions

1. Do I need a scan tool to put my Hyundai Tucson into EPB service mode?

No—most 2020+ models support the button sequence described above. However, an OBD2 scanner simplifies the process and provides confirmation messages. It’s also essential if you encounter error codes or a stuck caliper.

2. How do I know if my Tucson model requires service mode?

If your Tucson has an electronic parking brake (a button on the center console), service mode is mandatory for rear brake work. If it has a traditional foot pedal or hand lever, you can compress the pistons manually without any special steps.

3. Can I replace rear brake pads without EPB service mode?

Not safely. Attempting to compress the caliper piston without disabling the EPB motor can strip the motor’s gears, damage the caliper, and trigger costly repairs. Always use service mode.

4. What models or years use this procedure?

The button sequence works reliably for Hyundai Tucson (NX4) from 2020 to present. Models from 2016–2019 may need the infotainment menu or an OBD2 scanner—check your owner’s manual for the exact method.

5. My dashboard dims during the process—is that normal?

Yes. Pressing the brake pedal with the ignition ON (engine off) draws current for brake lights and pump priming, causing a temporary voltage drop. Use a battery maintainer to prevent the system from entering a low-voltage protection mode, which can abort the sequence.

6. How long does service mode last?

The mode stays active until you manually exit it (by following the exit sequence) or until you cycle the ignition OFF and back ON. It does not time out after a set period.

7. What if I accidentally start the engine while in service mode?

No permanent damage occurs, but the EPB may automatically re-engage. Turn the engine OFF, then repeat the activation sequence to re-enter service mode.

8. After exiting service mode, the rear brakes feel spongy. Why?

You likely introduced air into the brake lines when compressing the pistons. Bleed the rear brakes using standard two-person or vacuum bleeding methods. If the pedal still feels soft, check for leaks at the caliper connections.

9. Can I use the same steps for a Hyundai Santa Fe or Kia Sportage?

Yes, similar Hyundai and Kia models from 2020 onward use nearly identical procedures. For example, the 2021+ Santa Fe and 2022+ Sportage both respond to the double-pedal-press sequence. Always verify with your model’s service manual for exact steps.

10. Is there a risk of door/airbag warnings lighting up?

No. Service mode only affects the EPB system. Other warning lights should not appear if you follow the procedure correctly. If you see unrelated warnings, check for loose connectors or a weak battery.

For more details on brake service procedures, check out our guide on [link to related guide on brake pad replacement for Hyundai Tucson]. If you're looking for a recommended OBD2 scanner for EPB service, see our review of [link to related guide on OBD2 scanners for electronic parking brakes].

About the Author: Erwin Salarda is an Automotive Service Equipment Technician based in the Philippines, specializing in computerized automotive diagnostic equipment such as OBD scanners and wheel alignment systems. Since 2012, he has been actively providing technical support, equipment installation, troubleshooting, after-sales service, and hands-on training for automotive service equipment used by workshops and automotive professionals.

He has received specialized training from international suppliers and manufacturers, including Launch X431 in Shenzhen, China, Lawrence Engineering Company in Guangzhou, China, and 3Excel Wheel Alignment Company in Shenzhen, China. Through these trainings, he developed advanced expertise in automotive diagnostics, calibration, wheel alignment systems, and computerized automotive service technologies.

Erwin Salarda provides professional after-sales support and technical training for automotive diagnostic and wheel alignment equipment, helping clients maximize the performance and proper use of their tools and systems. His experience covers equipment setup, software updates, calibration procedures, troubleshooting, and operational guidance for automotive workshops and service centers.

With more than a decade of experience in the automotive equipment industry, Erwin Salarda continues to support automotive businesses by delivering reliable technical expertise and practical training solutions.

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