On an equipped 2025 Toyota Tundra, Downhill Assist Control (DAC) works in 4H below about 18 mph (30 km/h). Press the DAC/CRAWL switch, then use the mode select switch to set a downhill speed of approximately 3–18 mph (4–30 km/h). DAC helps control descent speed while you steer; it does not replace careful route choice, braking, or driver judgment.
Last updated: September 19, 2026
Quick Answer
For a 2025 Toyota Tundra with DAC, select 4H and stay below about 18 mph (30 km/h). Press the DAC/CRAWL switch, confirm the downhill-assist indicator, then turn the mode select switch to choose approximately 3–18 mph (4–30 km/h). Keep steering and stay ready to brake. Crawl Control is separate and operates in 4L on the 2025 Tundra.
Key Takeaways
- On the 2025 U.S.-market Tundra, DAC operates in 4H below about 18 mph (30 km/h).
- DAC has an adjustable set-speed range of approximately 3–18 mph (4–30 km/h); Crawl Control separately uses five low-speed settings in 4L.
- Toyota’s 2026 U.S. product information lists DAC, Crawl Control, and Multi-Terrain Select as standard on TRD Pro and trucks equipped with the TRD Off-Road Package.
- Brake Hold and DAC cannot be active at the same time, and DAC does not steer or make an unsafe slope safe.
At a Glance
| Transfer Mode | 4H on the 2025 Tundra |
| Operating Speed | Below about 18 mph (30 km/h) |
| Selectable DAC Speed | Approximately 3–18 mph (4–30 km/h) |
| Main Controls | DAC/CRAWL switch, mode select switch, and multi-information display |
What Is Downhill Assist Control (DAC)?
Downhill Assist Control is an off-road driver-assistance feature that helps limit vehicle speed on a descent. Toyota describes DAC as a system that helps the driver navigate difficult slopes by controlling downhill speed. You still choose the line, steer around obstacles, watch traction, and intervene when needed.
DAC is not the same as Crawl Control. Toyota describes Crawl Control as a low-speed off-road cruise-control feature with five selectable speeds. On the 2025 Tundra, Crawl Control requires 4L, while DAC requires 4H. Multi-Terrain Select is another separate feature that adjusts wheel-spin control for different surfaces.
Note: Both systems use selectable speed control, but they are not the same. Toyota’s 2025 Tundra manual gives DAC an approximate 3–18 mph (4–30 km/h) set-speed range in 4H, while Crawl Control uses five low-speed settings in 4L.
Which Toyota Tundras Have Downhill Assist Control?
Toyota’s 2026 U.S. product information lists Multi-Terrain Select, Crawl Control, and Downhill Assist Control as standard on Tundra TRD Pro models and trucks equipped with the TRD Off-Road Package. Availability still varies by model year, market, grade, drivetrain, and package.
Before heading downhill, confirm that your truck has the DAC/CRAWL control and a downhill-assist indicator in the multi-information display. If your Tundra is from an older generation, do not reuse the 2025 procedure automatically; older DAC systems can have different 4WD-range requirements.
Before You Activate DAC
- Confirm the feature: Make sure the control and instrument display identify DAC, not Crawl Control.
- Inspect the route: Check the slope angle, loose rocks, mud, ice, ruts, drop-offs, and the space available at the bottom.
- Reduce speed first: Set up before the steep section instead of trying to activate the system after the truck accelerates.
- Select 4H on a 2025 Tundra: Toyota specifies 4H for DAC operation and says the system will not operate if the transfer mode is changed to another setting. For transfer-mode basics, see Toyota Tundra 4WD system explained.
- Turn off Brake Hold: Toyota states that Brake Hold and DAC cannot be activated at the same time.
- Secure occupants and cargo: Buckle seat belts and make sure loose cargo cannot shift during the descent.
Warning: DAC is an aid, not autonomous driving. Keep both hands ready to steer, keep your feet ready to brake or accelerate, and stop if traction, visibility, or the route becomes unsafe.
Step-by-Step Guide to Activating DAC in Your Toyota Tundra
- Slow down before the descent. On the 2025 Tundra, DAC operates only below about 18 mph (30 km/h), so set up before the steep section.
- Select 4H. The 2025 owner’s manual specifies 4H for DAC. Do not select 4L for this procedure; 4L is used by Crawl Control on the same truck.
- Make sure the shift lever is not in Park. Toyota says DAC will not operate in P and recommends a lower shift range when appropriate for effective use.
- Turn off Brake Hold if it is active. Brake Hold and DAC cannot be activated at the same time.
- Press the DAC/CRAWL switch. Confirm that the downhill assist control indicator comes on in the multi-information display.
- Set the downhill speed. Turn the mode select switch to choose approximately 3–18 mph (4–30 km/h). Start at the low end on steep, loose, or unfamiliar terrain.
- Steer and monitor the truck. The slip indicator may flash, the brake lights may illuminate, and operating sounds can occur while DAC is working.
- Brake or stop if control deteriorates. DAC cannot overcome poor traction, excessive slope, or an unsafe route.
- Turn DAC off after the descent. Press the DAC/CRAWL switch as described in the manual and wait for the indicator to show that the system has fully stopped operating.
| Step | What to Check | Ready to Continue? |
|---|---|---|
| 1 | Truck is equipped with DAC | DAC control or indicator is present |
| 2 | 4H selected and Brake Hold off | 4H indicator is steady and no conflict message appears |
| 3 | DAC activated and speed selected | DAC indicator is on and the selected speed is shown |
| 4 | Route remains clear | You can steer and stop safely |
How Do You Adjust Toyota Tundra DAC Speed?
On the 2025 Tundra, turn the mode select switch while DAC is active. Toyota specifies an approximate set-speed range of 3–18 mph (4–30 km/h), and the selected speed appears on the multi-information display. This is separate from Crawl Control’s five selectable low-speed settings.
Choose the lowest practical DAC speed before a steep or loose descent, then increase it only if the surface, visibility, and available stopping space support a faster setting. If the truck gains speed beyond what feels safe, use the brakes and stop rather than expecting DAC to recover an unsafe approach.
Pro Tip: Set your speed before the steepest part of the descent. A slow, straight entry gives the tires and brake-control system more room to respond.
Benefits of Using DAC With Proper Braking
DAC can reduce the amount of constant pedal modulation needed on a rough descent. The system may apply braking automatically to help keep the truck at a manageable speed, giving you more attention for steering and obstacle placement.
However, DAC does not make normal braking obsolete. Engine braking, careful route selection, tire grip, and appropriate pedal input still matter. Treat the system as an extra layer of control rather than a replacement for driving judgment.
Enhanced Control Over Speed
On loose or uneven terrain, smooth automatic brake control can be easier to manage than repeated hard pedal inputs. The goal is a steady descent with fewer abrupt weight transfers, not a faster descent.
Reduced Driver Fatigue
During a long, low-speed downhill section, DAC can reduce how often you need to make small brake corrections. You must still monitor the slope, steering angle, wheel placement, and the truck’s warning messages.
DAC vs. Crawl Control vs. Multi-Terrain Select
| System | Main Job | 2025 Tundra Requirement | What You Control |
|---|---|---|---|
| Downhill Assist Control | Helps limit speed while descending | 4H; below about 18 mph; selectable approx. 3–18 mph | Steering, route choice, and any needed override |
| Crawl Control | Maintains one of five low off-road speeds | 4L; shift lever out of P or N; driver’s door closed | Steering and speed selection |
| Multi-Terrain Select | Adjusts wheel-spin control for selected terrain | Available modes depend on whether 4H or 4L is selected | Terrain mode and steering |
How to Maximize DAC for Off-Roading Success
- Walk the obstacle first when practical. Look for hidden holes, loose ledges, sharp rocks, and a safe exit.
- Keep the wheels as straight as the route allows. Large steering angles can reduce stability and available grip.
- Use a low entry speed. DAC works best as a control aid, not as an emergency recovery from excessive speed.
- Watch the instrument display. A flashing indicator or warning message can mean an activation condition is not met.
- Leave extra space. Loose gravel, mud, snow, and wet rock can increase stopping distance.
- Stop after repeated overrides. If you keep braking heavily, reassess the route, 4WD setting, and surface conditions.
Top 5 Mistakes Drivers Make With DAC
Most DAC problems begin before the descent. Confirm the equipment, choose the correct system, and set up at low speed before relying on electronic assistance.
1. Assuming Every Tundra Has DAC
DAC is not a universal feature on every Tundra configuration. Check the controls, window sticker, equipment list, or model-specific manual before planning to use it.
2. Confusing DAC With Crawl Control
Both systems use the DAC/CRAWL control area and both let the driver select speed, which makes them easy to mix up. On the 2025 Tundra, DAC runs in 4H with an approximate 3–18 mph set-speed range, while Crawl Control runs in 4L with five selectable low-speed settings.
3. Entering the Descent Too Fast
DAC cannot correct every poor approach. Slow down before the slope, choose a safe line, and avoid sudden steering or braking on loose surfaces.
4. Treating DAC as Hands-Off Driving
The system does not steer or judge the route. Keep both hands engaged, scan ahead, and use the pedals whenever control or safety requires it.
5. Ignoring Indicators or Warning Messages
If the DAC indicator flashes or the display says an operating condition is not met, stop and correct the setup. Do not continue simply because the button was pressed.
Why Won’t Toyota Tundra DAC Engage?
| Symptom | Likely Check | What to Do |
|---|---|---|
| No DAC indicator | Truck may not be equipped, or the system may have a fault | Verify equipment; if the indicator does not come on when the switch is pressed, have the truck inspected |
| Indicator flashes and DAC will not operate | Transfer mode is not 4H, shift lever is in P, speed is above about 18 mph, or the brake system is overheated | Stop safely, select 4H, move out of P when ready to drive, reduce speed, and let overheated brakes cool |
| Brake Hold message appears | Brake Hold is active | With the brake pedal depressed, turn Brake Hold off before activating DAC |
| Pulsing, vibration, or mechanical sounds | Normal brake-control operation may create feedback | Monitor the indicators; stop and inspect the system if a warning appears or control feels abnormal |
Frequently Asked Questions
Does every Toyota Tundra have Downhill Assist Control?
No. Toyota’s 2026 U.S. product information lists DAC, Crawl Control, and Multi-Terrain Select as standard on TRD Pro models and trucks equipped with the TRD Off-Road Package. Equipment varies by model year, market, grade, drivetrain, and package.
Is DAC the same as Crawl Control?
No. On the 2025 Tundra, DAC operates in 4H and lets you set approximately 3–18 mph for downhill control. Crawl Control operates in 4L and uses five selectable low-speed settings while the truck manages propulsion and braking.
Should I use 4H or 4L with DAC?
Use 4H with DAC on the 2025 U.S.-market Tundra. Do not use this instruction for older generations without checking the correct owner’s manual, because earlier Tundra DAC systems can use different transfer-case requirements.
Can I press the brake while DAC is active?
Yes. DAC is only a driver-assistance system, so brake whenever speed, traction, or an obstacle requires it. If you need heavy or repeated braking, stop and reassess the route, set speed, and surface conditions.
Does Downhill Assist Control steer the Tundra?
No. DAC assists with downhill speed only. You remain responsible for steering, wheel placement, obstacle avoidance, and stopping.
When should I avoid using DAC?
Do not rely on DAC when the route is blocked, traction is too poor, the indicator shows a fault, or you cannot maintain a safe line. Stop and choose another approach when conditions exceed the system’s limits.
Conclusion
For a 2025 Toyota Tundra with DAC, the correct setup is straightforward: select 4H, stay below about 18 mph, press the DAC/CRAWL switch, and set a downhill speed of approximately 3–18 mph with the mode selector. Keep steering, watch the indicators, and stay ready to brake. Use Crawl Control—not DAC—when you need the truck’s five-speed low-range control in 4L. If the terrain, traction, or system response feels unsafe, stop and reassess.
Sources
- Toyota Owners: 2025 Tundra Manuals and Warranties — official source for the 2025 Tundra owner’s manual (OM0C066U), including DAC, Crawl Control, 4WD, and Brake Hold operating instructions.
- Toyota USA Newsroom: 2026 Toyota Tundra — confirms current U.S. availability of DAC, Crawl Control, and Multi-Terrain Select on TRD Pro and TRD Off-Road Package-equipped trucks.
- Toyota: 2025 Tundra eBrochure — provides Toyota’s DAC safety disclosure and model-year feature context.
