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Brose error 25: Motor current measurement fault

Brose Drive (S, T, C - also used by Bulls, Rotwild, Fantic, BH, Trek Allant)Dealer neededDo not keep riding

The motor controller has detected a problem with how it is measuring the current flowing through the drive unit. The system disables pedal assistance and walk assist as a precaution, and the display may show zero speed or freeze the assist level. Powering everything off and back on is the first check, because the fault often points to a sensor reading rather than a confirmed hardware failure.

Drive system	Brose Drive (S, T, C - also used by Bulls, Rotwild, Fantic, BH, Trek Allant)
Severity	Dealer needed
Keep riding?	Do not keep riding
Typical cost	A dealer diagnostic typically runs 40 to 80 EUR, and if the motor or controller has to be replaced parts and labour usually land between 450 and 900 EUR depending on the model.

Likely causes

Loose or corroded connector between the motor and the controller harness
Moisture ingress in the motor housing or its multi-pin plug
Internal current sensor drift or failure inside the drive unit
Software bug after a firmware update or partial power event
Impact damage to the motor case disturbing the sensing circuit

How to fix Brose error 25

Stop riding and dismount the bike.
Switch the system off using the control panel button and wait at least 30 seconds.
Switch the system back on and check whether the code clears.
Inspect the motor cable and connector at the frame exit for obvious damage, water or pushed pins.
Charge the battery to full and run the restart sequence again.
If the code returns on the next ride, book the bike in with your e-bike dealer for a diagnostic on the Brose service tool.

Go to a dealer if: The code returns after a full power cycle, because the drive unit then needs dealer-level diagnostic and likely a motor or controller replacement.
Warranty: An internal sensor failure inside the warranty period is treated as a manufacturer fault and covered; crash damage, water ingress from submersion and worn or tampered connectors are routinely excluded.
Typical cost: A dealer diagnostic typically runs 40 to 80 EUR, and if the motor or controller has to be replaced parts and labour usually land between 450 and 900 EUR depending on the model.

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 brose error 25?

Yes, switch the bike off on the control panel, wait at least 30 seconds, then switch it back on. If the code returns on the next ride, only a dealer diagnostic on the Brose service tool can clear it properly.

Is it safe to keep riding with this code showing?

No, the system has cut assistance to protect the motor and controller. Riding is technically possible without support but the sudden loss of power in traffic or on a climb is a hazard, so stop and arrange transport to the workshop.

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

Expect 40 to 80 EUR for the diagnostic and 450 to 900 EUR if a motor or controller has to be replaced. Bikes under two years old with an internal sensor fault are normally covered by the manufacturer, while water damage or crash impact are not.

Related Brose codes

20 · Drive unit reports incorrect electrical readings 40 · Motor drawing excessive current 43 · Motor Short Circuit Fault 44 · Motor Has Overheated

Manuals and video

Specialized Rider Care knowledge base (manuals)

Official source: Brose error code table, Pedego dealer service guide

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