What Error 414 Means

Error 414 signals that the display has lost CAN bus communication with the drive unit. The Bosch system uses a proprietary CAN bus to connect motor, battery, display, and sensors. When the display cannot send or receive valid data frames within the expected timeout, error 414 is raised and motor assistance is cut. This is almost always a wiring or connector issue — the motor itself is likely functioning correctly.

Root Causes

  1. Loose or corroded display connector — Road vibration over thousands of kilometres can work the connector loose.
  2. Damaged display cable — The cable is subject to flex fatigue at the handlebar clamp where it bends with every steering input.
  3. Water in connector housing — Moisture creates resistance across CAN bus signal pins.
  4. Firmware mismatch — If a partial firmware update was interrupted, display and motor may run incompatible versions.

Fix Procedure

Step 1: Inspect the Display Connector

Locate the multi-pin connector joining the display cable to the motor harness. Disconnect, inspect for oxidation or pushed-back pins, clean with contact cleaner spray, dry, and reconnect firmly.

Step 2: Check the Full Cable Run

Trace the display cable from display head to motor. Look for pinched sections under bar clamps, abrasion against the frame, and tight bends. Any breached section requires cable replacement.

Step 3: Power Cycle

Remove the main battery, wait 60 seconds to fully discharge controller capacitors, reinstall, and power on.

Step 4: Firmware Check

Connect via eBike Flow app (Smart System) or visit a dealer (System2) to check for pending firmware updates.