When your Shimano STEPS display interface throws Error E013, all electrical assistance grinds to an immediate halt. This firmware fault can occur during or immediately following a software update, or during an unexpected system startup error, leaving riders stranded without motor support.
Fast-Fix: The 45-Second Solution
Shimano Error E013 does not present an immediate physical safety hazard, putting it in the medium risk tier. The code indicates that the drive unit has detected a firmware initialization anomaly or a corrupted software file. Your first action step is to turn off the e-bike, wait 30 seconds, disconnect and firmly reconnect the main display cable to ensure a clean data link, and turn the system back on.
Quick Risk Snapshot
- Likely severity tier: Medium
- Safe to use/drive? Yes, the bike is mechanically sound to pedal manually, but all electronic assist will be locked down until the firmware conflict is resolved.
- Most common cause: An interrupted or incomplete wireless firmware update over the Shimano E-Tube Project mobile app via Bluetooth.
- Rare but serious cause: A corrupted flash memory sector on the internal drive unit motherboard, preventing the motor’s operating system from loading during startup.
When This Is Low Risk vs High Risk
- If the error occurs immediately after updating your bike through the smartphone app: This is low risk. It usually signifies a simple software handshake dropout that can be overwritten by re-running the update tool.
- If the error appears mid-ride without any recent software alterations: This points to a higher risk level, indicating potential data wire damage or an internal hardware failure inside the motor block.
- If the error occurs after your e-bike has been deeply submerged in water or subjected to a high-pressure wash: Stop using the bike immediately and remove the battery pack. This indicates water has breached the internal casing, short-circuiting the memory storage chip.
What This Usually Means (System-Level)
Your Shimano drive unit runs on firmware, which acts as the core operating system directing the motor’s power distribution, torque tracking, and heat sensors. Think of the firmware like the software on your smartphone. When you turn on your e-bike, the system conducts a brief digital boot sequence to verify that all hardware components speak the exact same language version.
Error E013 triggers when this boot check fails because the drive unit reads an incomplete code block or a corrupted setting file. Just like a computer getting stuck on a blue crash screen due to a missing system file, the Shimano motor locks itself into a defensive safety state to prevent erratic power delivery or uncontrolled acceleration.
Probability Breakdown
- Interrupted wireless app update (60%): The smartphone screen timed out, or the Bluetooth connection dropped while flashing data to the bike.
- Component software mismatch (25%): A newly installed component (like a replacement display or electronic shifter) is running an older firmware version than the motor.
- Data packet corruption during boot (10%): A temporary voltage dip from loose battery contacts scrambled the initial startup data handshake.
- Internal memory chip hardware failure (5%): The drive unit’s permanent storage module has reached its end of life or suffered physical damage.
What Increases the Risk
- Updating firmware with a low smartphone battery: If your phone dies mid-transfer, it leaves the e-bike with half-written code.
- Leaving your phone far from the bike during an update: Walking away with your phone breaks the Bluetooth connection during critical installation moments.
- Ignoring loose or dirty E-Tube connection ports: Heavy grease or grit inside the tiny round E-Tube plug ports can distort the digital signals passing between the display and the motor.
If Ignored: 24 Hours → 1 Week → 1 Month
- Within 24 hours: The motor will continue to deny assist modes, requiring full physical effort to pedal the e-bike.
- Within 1 week: If left unaddressed after a failed update, the system can remain stuck in a bootloop, draining the small internal batteries tucked inside some display screens or electronic shifters.
- Within 1 month: Unresolved firmware mismatches make it impossible to diagnose other issues, as the official Shimano diagnostic software will refuse to communicate with a broken system log.
What This Is Often Confused With
- Shimano STEPS E010: This is a generic system error that often points to a physical power delivery disruption rather than a code conflict. For battery or main connection issues, consult Shimano STEPS E010: System Error Troubleshooting.
- Shimano STEPS E012: This code indicates a sensor initialization fault that triggers when a rider puts pressure on the pedals during startup. You can tell them apart because E012 clears instantly if you restart without touching the pedals, while E013 remains locked on screen. See Shimano STEPS E012: Sensor Initialization Error Fix.
What To Do Right Now
- Power Off: Shut down the Shimano system using the main power button.
- Hard Reset: Remove the main e-bike battery pack from its frame dock, wait 60 seconds to clear residual voltage, and snap it back into place firmly.
- Check the Cables: Use a Shimano E-Tube plug tool (or your fingers carefully) to check the small round data cables behind the display and along the handlebars. Make sure they are pushed all the way in.
- Force a Hardwired Reconnect: Open the Shimano E-Tube Project app on your smartphone, turn the bike on, and see if the app can locate the bike to restart the update.
- Clear App Cache: If the app freezes, clear your phone’s Bluetooth cache, restart your phone, and try the wireless connection step again.
When To Stop Immediately
- Stop attempting to overwrite the firmware if your smartphone or computer continuously displays an “Error: Communication Failed” window. Repeatedly forcing data into a corrupted chip can completely lock out the system.
- Do not attempt to ride the bike if the display screen starts flickering wildly or smells of burnt electronics, which signals a serious hardware short rather than a code error.
What a Professional Will Check
If wireless attempts fail, an authorized bike shop will bypass Bluetooth entirely. They will use a Shimano SM-PCE02 professional linkage device to plug your e-bike directly into a shop computer via a stable USB cable. This professional diagnostic software allows the mechanic to perform a “Firmware Recovery Mode” restore, which completely wipes the corrupted memory sector and flashes a fresh, factory-verified copy of the software onto the drive unit. They will also run an error log history check to confirm that no sub-components are pulling down the network voltage line.
Typical Repair Range
- Zero Cost (DIY): Free if resolved by re-running the E-Tube app update or checking for loose data plugs.
- Shop Diagnostics & Wired Recovery ($40 to $90): Standard labor charge for a technician to connect the physical SM-PCE02 box and run the official recovery software tool.
- Data Wire Replacement ($30 to $60): If a pinched or broken E-Tube wire is found to be scrambling the data stream between components.
- Drive Unit Replacement ($600 to $900+): If the internal storage chip is physically broken or un-writable, a complete motor replacement is required as the motherboard is non-serviceable.
Related Symptom Escalators
- Combined with E020: If you see E013 along with communication fault codes, your data cables are physically failing to transmit the update across the bike network. For managing network failures, refer to Shimano STEPS E020: Communication Fault Fix.
- Combined with an unresponsive battery light: If the battery lights fail to illuminate when the error is active, the power supply line to the motor’s software brain is being cut off prematurely.
Ride Check
Shimano Error E013 is almost always a digital conflict caused by an interrupted wireless software installation rather than a dead motor. Before panicking, perform a complete power cycle and check that your handlebar data wires are plugged in snugly. Try to reconnect the bike to the Shimano E-Tube app to re-run the software update. If your phone cannot establish a clean Bluetooth link to clear the code, take the e-bike to a local dealer who can use a wired diagnostic box to force a factory firmware recovery.