Home › Bosch › Error 0x5B1030

Bosch error 0x5B1030: Motor internal critical temperature error

Bosch eBike (DiagnosticTool / eBike Flow hex code)WarningRide with caution

The drive unit has reported an internal temperature above its critical limit and Bosch has cut motor support to protect the electronics and motor windings. On the display this shows up as the 0x5B1030 diagnostic code and the rider gets no pedal assistance until the unit cools. Lights, brakes and gears continue to work normally; only the motor is disabled.

Drive system	Bosch eBike (DiagnosticTool / eBike Flow hex code)
Severity	Warning
Keep riding?	Ride with caution
Typical cost	A dealer diagnostic typically runs €40 to €80, cleaning and a firmware update around €40 to €120, while replacing a faulty drive unit on most Bosch Active Line, Performance Line or CX motors lands between €450 and €900 fitted depending on the generation.

Likely causes

Sustained high-torque riding on long climbs or full-power assist in hot weather
Blocked cooling fins or motor housing covered in packed mud, leaves or debris
Riding repeatedly at maximum assistance level without giving the motor recovery time
Firmware fault or failed internal temperature sensor sending an incorrect reading
Motor mounted in a tight frame area with restricted airflow around the housing
Heat soak after a long descent with heavy regen or prolonged motor braking
Damaged motor gasket allowing water ingress that confuses the temperature sensor

How to fix Bosch error 0x5B1030

1. Stop pedalling, switch off the system at the display and remove the battery if the housing feels hot to the touch.
2. Move the bike into shade and leave it stationary for at least 20 to 30 minutes so the drive unit can cool passively.
3. Once cooled, power the system back on and check whether the code clears on its own.
4. Inspect the motor housing and cooling fins; wipe away mud, grass and debris and make sure the side covers are clear.
5. On the next ride, drop one assist level, avoid holding full power on long climbs and let the motor rest on descents.
6. If the code reappears within a few minutes of riding, or returns after every ride regardless of load, stop using the motor and book the bike in at a Bosch dealer for a DiagnosticTool read and temperature sensor check.
7. Do not attempt to open or dismantle the drive unit yourself; internal temperature faults that keep recurring point to a sensor or control board fault that needs dealer-level diagnostics.

Go to a dealer if: Take the bike to an authorised Bosch dealer if the error returns after a full cool-down or keeps reappearing within minutes of starting a ride, because the drive unit needs a DiagnosticTool read and possible internal sensor replacement.
Warranty: A genuine internal temperature sensor or control board fault inside the standard two-year warranty period is normally covered as a component defect, but the claim is usually rejected if the dealer finds mud-packed cooling fins, crash damage or signs of water ingress from poor sealing.
Typical cost: A dealer diagnostic typically runs €40 to €80, cleaning and a firmware update around €40 to €120, while replacing a faulty drive unit on most Bosch Active Line, Performance Line or CX motors lands between €450 and €900 fitted depending on the generation.

Still stuck? Take a photo of the display and show it to a local e-bike workshop. Bring the bike's system name (e.g. Bosch Performance Line CX) and the exact code; that saves diagnostic time and money.

Frequently asked

Can I reset bosch error 0x5B1030?

Yes, in most cases the code clears by itself once the drive unit has cooled: switch the system off, leave it in the shade for around 30 minutes and power it back on. If the code returns immediately or within a few minutes of riding, the temperature sensor or control board is likely faulty and needs dealer diagnostics rather than another reset.

Is it safe to keep riding with this code active?

Motor support will be switched off so the bike rides like a heavy unpowered bicycle, but the brakes, gears and lights still work normally and there is no fire risk once the unit has cooled. Limit riding to a slow, no-assist trip home or to the workshop and avoid long climbs until the code has cleared.

How much will the repair cost and is it under warranty?

A Bosch dealer diagnostic is usually €40 to €80 and a clean plus firmware update is €40 to €120, while a full drive unit replacement on Performance or CX motors typically runs €450 to €900 fitted. If the unit is under two years old and the dealer finds a genuine sensor or board fault with no sign of water ingress or neglect, Bosch generally covers it under warranty.

Related Bosch codes

0x510001 · Internal sensor error stalling motor assist 0x510003 · Internal sensor fault at startup 0x511001 · Acceleration sensor failure in the drive unit 0x503001 · Speed sensor signal missing or invalid

Manuals and video

Official source: www.ridewill.com

Not an official Bosch document. Compiled from workshop experience and public service information; details can differ per system version and bike brand.