Shimano Controller & Display Settings: A User’s Guide

Shimano’s e-bike systems—from the commuter-focused Steps E5000 to the trail-ready EP8—put a surprising amount of tuning power behind a small display. But the menus are cryptic, the manuals are dense, and the difference between “P1” and “C10” isn’t obvious. This guide walks through the settings that actually matter, what each one changes on the bike, and how to adjust them without turning your motor into a liability.

What You Need Before Changing Any Settings

Gather three things before you touch the controller. First, your bike’s model name and motor generation—the menu structure differs between the older SC-E8000 display and the current SC-EM800. Second, your owner’s manual or a photo of its settings table, because Shimano’s parameter numbering isn’t consistent across all systems. Third, a clear idea of what problem you’re solving: short range, punchy assist, or a display that shows kilometers when you think in miles.

The controller—the buttons on the handlebar—is where you make changes. On most Shimano setups, you’re using either the SW-E8000 (two-button) or SW-EM800 (three-button) unit. The left button scrolls through screens, the right button confirms or selects, and holding the right button for several seconds enters the settings menu. If your bike has a third-party display claiming Shimano compatibility, the menu structure may differ. Universal displays like the Bike Display LCD 5 Pin M5 Control Panel Bike Screen often use a “No. 2 protocol” that mimics Shimano’s data stream, but they don’t expose the full diagnostic menu. For complete control over Shimano-specific settings, stick with the OEM display that shipped with your motor.

The P-Menu: What Each Parameter Actually Changes

The “P” menu is where Shimano hides the motor tuning. These settings control how much assist you get, how quickly it kicks in, and how the system behaves at standstill. Here’s what the common parameters mean:

P1: Assist Mode Selection

This sets which assist modes are available. On Steps systems, you typically get Eco, Normal, and High. On E-MTB systems, you get Eco, Trail, and Boost. You can disable modes you never use—if you never ride in Eco, turning it off means fewer button presses to cycle through modes. This is a personal preference setting, not a performance one.

P2: Maximum Assist Ratio

This is the big one. P2 controls the maximum assist ratio—how much the motor multiplies your pedaling force. A setting of 50 means the motor adds 50% of your input; 200 means it doubles it. Higher settings drain the battery faster and make the bike feel more aggressive. For commuters who want range, a lower P2 value in Eco mode is the single most effective battery-saving change you can make.

P3: Assist Characteristics (E-MTB only)

On trail systems, P3 adjusts the “feel” of the assist curve. Lower values make the motor respond linearly to your pedal input—more predictable, better for technical climbing. Higher values make the assist spike quickly, which feels punchy but can catch you off guard on loose terrain. If you’re new to e-MTB, start low and work up.

P4: Maximum Torque

This caps the motor’s torque output. On the EP8, the motor can produce 85 Nm, but you can dial it down to 20 Nm if you want a more natural, analog feel. Lower torque settings also reduce stress on the drivetrain and improve range. For riders with a rear hub motor, this setting matters less because hub motors deliver torque differently than mid-drives.

P5: Start Mode

This controls how much assist you get when you begin pedaling from a standstill. A higher setting means the motor kicks in harder the moment you start pedaling—useful for stop-and-go city riding or steep hill starts. A lower setting feels smoother and prevents the bike from lurching forward when you’re just trying to creep through traffic.

P6: Speed Limit

This sets the assist cutoff speed. In the US, Class 1 and Class 2 e-bikes are limited to 20 mph; Class 3 to 28 mph. Shimano’s default settings match the class your bike was sold as. Changing this to exceed your local legal limit is possible on some systems, but it’s a regulatory decision, not a tuning one—and it can void your warranty and make your bike illegal to ride on public trails.

P7: Display Units

This switches between metric and imperial units for speed and distance. If your display shows kilometers and you think in miles, this is the first setting to change.

P8: Auto Power-Off Timer

Sets how long the system stays on after you stop pedaling. A shorter timer saves battery; a longer one is convenient if you make frequent short stops. Default is usually 5 or 10 minutes.

How to Actually Change a Setting: Step-by-Step

Here’s the sequence that works on most Shimano displays. It assumes you’ve already confirmed your display model and have the bike powered on.

Step 1: Enter the settings menu. Hold the right controller button for 5–10 seconds until the display switches from ride data to a menu screen. On the SC-EM800, you’ll see a list of categories; on older displays like the SC-E8000, you’ll jump straight into the P-menu. If nothing happens after 10 seconds, release and try holding the left button instead—some early Steps displays use the left button for menu entry.

Step 2: Navigate to the parameter you want. Use the left button to scroll through the numbered parameters (P1, P2, etc.). The display shows the current value next to the parameter number. If you’re looking for a specific setting and don’t see it, check your manual—some parameters are only visible when the bike is in a particular assist mode or when the motor is in a specific firmware version.

Step 3: Change the value. Press the right button to select the parameter, then use the left button to adjust the value up or down. Some displays require you to hold the right button to confirm the new value; others save automatically when you scroll to the next parameter. Watch the display for a confirmation icon or a brief flash—that’s your signal the change registered.

Step 4: Exit the menu. Hold the right button for 3–5 seconds, or scroll to the “Exit” option if your display has one. The screen returns to ride data.

Step 5: Test the change. Ride the bike and pay attention to the specific behavior you adjusted. If you changed P2 (assist ratio), you should feel the difference in the first few pedal strokes. If you don’t feel any change, re-enter the menu and confirm the value stuck—some displays revert to defaults if you exit too quickly.

Here’s where the branch comes in: if you changed P5 (start mode) and the bike now lurches forward aggressively when you begin pedaling, that’s a sign you overshot the setting for your riding conditions. Drop the value by 10–20% and test again. If the bike feels exactly the same as before, you may have changed the wrong parameter—go back and verify the parameter number matches your manual, because Shimano’s numbering isn’t identical across all motor generations.

Assist Levels: Range vs. Power Trade-Offs

The trade-off between range and power is the core decision in e-bike tuning. Here’s how to think about it:

For maximum range: Set Eco mode to a low assist ratio (around 30–50%) and a low torque cap. Ride in Eco as your default. On a 500Wh battery with a mid-drive motor, this can extend range by 30–40% compared to riding in High or Boost. The mechanism at work: the motor draws less current per pedal stroke, which reduces the amp-hour draw from the battery.

For maximum power: Set Boost or High mode to the maximum assist ratio (200–300%) and leave torque uncapped. This gives you the full motor output for steep climbs or heavy loads. The cost: you’ll see the battery percentage drop noticeably faster, and the motor will generate more heat on sustained climbs. If you’re hauling cargo or towing a trailer, this is the setting you want for hill starts.

For a balanced setup: Set Eco to a moderate assist ratio for flat commuting, Normal to a higher ratio for headwinds, and High/Boost to maximum for the occasional steep hill. This gives you a usable range of options without constantly switching modes.

One thing to note: assist ratio and torque are related but not identical. A high assist ratio with a low torque cap feels smooth and steady; a low assist ratio with a high torque cap feels punchy but short-lived. Match the settings to your riding style, not just the numbers.

Display Configuration: Units, Screens, and Data Fields

The display settings menu (usually accessed by holding the right button for 5–10 seconds) lets you customize what appears on screen. Here’s what you can change:

Screen layout: Most Shimano displays show speed, battery level, assist mode, and distance. You can often add or remove fields like cadence, average speed, and estimated range. On the SC-EM800, you can also configure the bar graph at the top of the screen to show either assist level or battery charge.

Units: As mentioned, P7 controls metric vs. imperial. On some displays, you can also set the clock format (12-hour vs. 24-hour).

Backlight behavior: You can set the backlight to always-on, auto-off after a delay, or off entirely. Always-on drains a small amount of battery but improves visibility in tunnels and at night. Auto-off is the best compromise for most riders.

Auto screen switching: Some displays can automatically switch between screens based on speed or assist mode. For example, you can set the display to show range when you’re in Eco and speed when you’re in Boost. This is a nice-to-have, but it can be distracting if you’re not used to the screen changing on its own.

Distance reset: The trip distance resets automatically when you turn the bike off, but you can manually reset it mid-ride. The odometer (total distance) is stored in the motor’s memory and can’t be reset without a dealer tool—this is deliberate, as it prevents odometer fraud on used bikes.

Error Codes and Diagnostics: Reading the Display

When something goes wrong, the display shows an error code. Here are the most common ones and what they mean:

E010: Battery communication error. The display can’t talk to the battery. Check the battery connection and make sure it’s fully seated. If the code persists, the battery’s internal BMS may have failed.

E014: Motor communication error. The display can’t reach the motor. This is often a wiring issue—check the cable between the motor and display for damage or loose connectors. On mid-drive motors, the cable runs along the downtube and can get pinched during transport.

E020: Internal motor error. The motor’s internal sensors are reporting a fault. This usually requires a dealer visit. Don’t try to ride through it; the motor may cut out mid-ride.

E025: Speed sensor error. The magnet on the wheel isn’t being detected. Check that the magnet is still attached to the spokes and aligned with the sensor on the frame. This is the most common error and the easiest to fix.

E043: Throttle error (where applicable). If your bike has a throttle and it’s stuck or disconnected, you’ll see this code. The system disables the motor until the throttle is fixed.

E100: System error. A catch-all code that usually indicates a firmware or communication issue. Try turning the bike off and on again. If it persists, a dealer can reflash the firmware.

E200: Torque sensor error. The motor can’t read your pedaling force. This makes the assist erratic or nonexistent. The torque sensor is inside the motor on mid-drives; it’s not a user-serviceable part.

When you see an error code, the display will also show a “W” (warning) or “E” (error) prefix. Warnings let you continue riding with reduced assist; errors shut the motor down entirely. If you’re mid-ride and get a warning, you can usually limp home. An error means you’re pedaling unassisted.

How to Verify a Fix Worked

After you’ve addressed an error code or changed a setting, don’t just assume it’s resolved. Here’s a concrete verification sequence:

For a speed sensor error (E025), after re-aligning the magnet, spin the front wheel by hand while watching the display. The speed readout should climb smoothly from zero and match your hand’s rotation speed. If the display still shows zero or jumps erratically, the magnet gap is still wrong—the sensor needs the magnet to pass within about 1/4 inch of its face.

For a battery communication error (E010), after re-seating the battery, power the system on and check the battery indicator. It should show the correct charge level within 2–3 seconds. If the display shows a full battery that then drops to empty after a minute of riding, the BMS is likely faulty, and you should stop riding—a failing BMS can over-discharge cells and create a fire risk.

For an assist ratio change (P2), ride a flat, familiar section of road at a steady cadence in the mode you adjusted. The motor’s contribution should feel noticeably different within the first 10 pedal strokes. If you feel no difference, re-enter the P-menu and confirm the value saved—then check whether you’re actually in the assist mode you edited, because changing P2 in Eco doesn’t affect Normal or High.

Model-Specific Notes: E5000, E6100, EP8, and Steps

Shimano’s systems differ in how much tuning they allow:

Steps E5000 (commuter/city): The E5000 motor is capped at 40 Nm and 20 mph. The P-menu is simplified—you get assist ratio, speed limit, and display settings, but not torque adjustment. This is fine because the motor doesn’t have much torque to give anyway. The E5000 is designed for flat, urban riding; don’t expect to turn it into a trail bike.

Steps E6100 (hybrid/commuter): The E6100 offers 60 Nm and a more complete P-menu, including torque settings. It’s a good middle ground for riders who want some tuning control without the full E-MTB feature set. The E6100 also supports Shimano’s automatic shifting (Auto-Shift) on compatible hubs, which changes how the motor responds to gear changes.

EP8 (E-MTB): The EP8 is Shimano’s flagship trail motor with 85 Nm. It has the full P-menu, including assist characteristics (P3) and torque control (P4). The EP8 also supports a “free shift” feature that lets you shift gears without pedaling, which changes how you approach climbs. The EP8’s settings are the most granular—you can fine-tune the assist curve to match your riding style.

Steps E7000 (older E-MTB): The E7000 is essentially a detuned EP8 with 70 Nm. It shares the same P-menu structure but lacks some of the newer firmware features like free shift. If you’re buying used, the E7000 is still a solid motor, but check the firmware version—older firmware may not support the full range of P-settings.

Steps E8000 (original E-MTB): The E8000 is the first-generation Shimano E-MTB motor. It’s been discontinued but is still common on used bikes. The P-menu is similar to the E7000, but the motor is louder and less efficient than the EP8. If you’re tuning an E8000, focus on P2 (assist ratio) and P5 (start mode)—those have the most noticeable effect on ride quality.

Common Mistakes and When to Stop

The most common mistake riders make is changing multiple parameters at once. If you adjust P2, P4, and P5 in the same session and the bike feels worse, you won’t know which change caused the problem. Change one setting, ride for a day, then change another.

The second most common mistake is assuming a higher setting is always better. A maximum assist ratio with a maximum torque cap sounds like the “best” setup, but on loose gravel or wet pavement, that combination can break rear-wheel traction on the first pedal stroke. If you feel the rear wheel slipping under power, back off the torque cap before you back off the assist ratio—torque is what breaks traction, not raw speed.

Know when to stop. If you’re getting error codes after a settings change, revert to the factory default and see if the codes disappear. If they don’t, the problem isn’t your settings—it’s hardware. And if your bike is under warranty, aggressive settings (especially high torque caps on a motor that’s already near its limit) can accelerate wear. The motor and drivetrain are rated for specific loads; exceeding them consistently can lead to premature failures that the dealer may not cover if the settings are clearly outside spec.

If you’ve made a change and the bike behaves unpredictably—motor cutting out, erratic assist, or a persistent error code—stop riding and revert your changes. A settings issue is one thing; a motor that shuts down mid-climb is a safety issue. When in doubt, a Shimano dealer can reflash the firmware to factory defaults and confirm whether the hardware is sound.