- Electric mobility
- Electric bicycle
50301E
Bosch eBike 50301E: Your drive unit has detected a communication error with the anti-lock braking system.
Risk level
High
Professional inspection is recommended.
Urgency
High
Quick answer
Your drive unit has detected a communication error with the anti-lock braking system. Your eBike is therefore in limp-home mode, and reduced drive unit output is available to you. For 50301E, Bosch's user step is: Check the anti-lock braking system speed sensor on the front wheel for damage and correct assembly (e.g. loose bolts/screws, cable outlets). If the problem persists, please contact your specialist dealer. If the same code returns, preserve the display and stop repeating resets.
Safety first
Stop and check this first
- Assume ABS may be unavailable. Ride only if normal mechanical braking is confirmed and conditions are safe; otherwise do not continue and arrange transport to a specialist.
Safe checks you can perform
- Preserve the code before changing anything
- Apply only Bosch's published user step
- Use recurrence as the stop point
Leave these tasks to a qualified professional
- Do not attempt this professional task: Measured handoff for 50301E
What a technician must be able to justify
A technician is coming
These are the steps they must carry out and show you. Tick them as they work: if steps are skipped, do not accept a part swap.
These are not instructions for opening or handling the equipment yourself. They are the checks that should support a technical conclusion.
Measured handoff for 50301E
What they doUse the saved timing, system generation and Bosch diagnostics to test Drive unit in the state that produced 50301E; verify software, connectors and component values before replacement.
Before accepting a part or repair
Nothing has been shown yet. Do not accept a part swap based on the code alone.
Checks and evidence, step by step
Follow the documented order. An error code identifies the affected system, but it does not prove by itself which part has failed.
- 1
Preserve the code before changing anything
No special tools
Procedure
Photograph 50301E. Record the eBike model, Bosch system generation if known, battery level, Drive unit, what stopped working and when the code appeared.
Assume ABS may be unavailable. Ride only if normal mechanical braking is confirmed and conditions are safe; otherwise do not continue and arrange transport to a specialist.
Evidence: Bosch eBike Systems — official fault code 50301E
- 2
Apply only Bosch's published user step
No special tools
Procedure
Check the anti-lock braking system speed sensor on the front wheel for damage and correct assembly (e.g. loose bolts/screws, cable outlets). If the problem persists, please contact your specialist dealer. Record whether the condition “Your drive unit has detected a communication error with the anti-lock braking system.” disappears and whether 50301E reappears after the exact published step. Do not add an undocumented reset or open a component.
Assume ABS may be unavailable. Ride only if normal mechanical braking is confirmed and conditions are safe; otherwise do not continue and arrange transport to a specialist.
Evidence: Bosch eBike Systems — official fault code 50301E
- 3
Use recurrence as the stop point
No special tools
Procedure
If 50301E remains absent, monitor the same function; that does not prove a repair. If “Your drive unit has detected a communication error with the anti-lock braking system.” or 50301E returns, stop the user checks and book a Bosch eBike specialist.
Assume ABS may be unavailable. Ride only if normal mechanical braking is confirmed and conditions are safe; otherwise do not continue and arrange transport to a specialist.
Evidence: Bosch eBike Systems — official fault code 50301E
Where this code applies
A code is meaningful only inside the right product and version context.
Primary scope
- System
- Electric mobility
- Brand
- Bosch eBike Systems
- Product type
- Electric bicycle
Known code variants
- Bosch 50301E bici elettrica
- Bosch 50301E bicicleta eléctrica
- Bosch 50301E E-Bike
- Bosch 50301E eBike
- Bosch 50301E vélo électrique
- Bosch eBike code 50301E
- Bosch eBike error 50301E
- Bosch eBike Fehler 50301E
- Bosch eBike Fehlercode 50301E
- code Bosch eBike 50301E
- codice Bosch eBike 50301E
- código Bosch eBike 50301E
- erreur Bosch eBike 50301E
- error Bosch eBike 50301E
- errore Bosch eBike 50301E
What it means
Bosch eBike Systems assigns 50301E to Drive unit with source severity ERROR. It reports the detected state, not proof that one particular part has failed. Your eBike is therefore in limp-home mode, and reduced drive unit output is available to you.
Warnings and stop conditions
- Highsource verified
Assume ABS may be unavailable. Ride only if normal mechanical braking is confirmed and conditions are safe; otherwise do not continue and arrange transport to a specialist.
Evidence: Bosch eBike Systems — official fault code 50301E
Symptoms and causes
Probable causes · in order
- What the code establishesConfirmed
Bosch identifies 50301E at Drive unit: Your drive unit has detected a communication error with the anti-lock braking system. Keep that meaning scoped to a Bosch eBike system and the exact code shown.
Evidence: Bosch eBike Systems — official fault code 50301E
- What the official step decidesPossible
If “Your drive unit has detected a communication error with the anti-lock braking system.” clears after Bosch's exact step, only the current condition has cleared; no failed part has been proved. If 50301E returns, the documented user branch is exhausted and the recurrence becomes the evidence for service.
Evidence: Bosch eBike Systems — official fault code 50301E
Virtual technician
Does 50301E still appear after these checks?
Answer a few questions to narrow down the likely cause and the safest next action. Guidance only - it never replaces a professional.
Sources and technical references
- 1
Bosch eBike Systems — official fault code 50301E
Bosch eBike Systems · 2026 · official_doc
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