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Bosch error 0x540022: Drive unit overheat protection triggered

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

The internal temperature sensor in the drive unit has reported a case temperature above 80 °C. As a protective measure the controller switches motor support off entirely; the bike still pedals as an unpowered bicycle and the display remains live. The walk-assist function is also disabled while the fault is active. Once the housing cools below the threshold the system will allow a restart, but only if the underlying cause is no longer present.

Drive system	Bosch eBike (DiagnosticTool / eBike Flow hex code)
Severity	Warning
Keep riding?	Ride with caution
Typical cost	A clean-and-cool owner fix costs nothing, dealer diagnostics typically run €40–€80, a firmware reflash with sensor verification is €30–€60, and a full drive unit replacement where required is €600–€900 including labour.

Likely causes

Sustained climbing in Turbo or eMTB mode on a hot day with a heavy rider or loaded rear rack
Low-speed riding in high assist where airflow over the motor housing is minimal
Mud, dust or vegetation packed around the motor cooling fins reducing heat dissipation
Ambient temperature above 30 °C combined with repeated stop-and-start urban use
Internal temperature sensor drift or wiring fault giving a false reading (less common)

How to fix Bosch error 0x540022

Stop pedalling and power the system down using the display button.
Move the bike into shade and out of direct sun on the motor housing.
Leave the bike stationary for 15–20 minutes so the drive unit can dissipate heat.
Switch the system back on and check whether the code clears on the startup screen.
Inspect the motor housing and cooling fins for compacted mud or debris, and clean if accessible.
On the next ride use Eco or Tour mode, avoid sustained high-power climbs, and monitor the temperature gauge if fitted.
If the warning reappears within minutes on flat ground or in mild weather, take the bike to a Bosch-certified dealer for a diagnostic readout.

Go to a dealer if: If the code returns immediately after a full cool-down and the motor housing is clean, the drive unit has an internal sensor or controller fault that requires dealer-level diagnostic equipment to confirm.
Warranty: Overheating caused by sustained high-load riding is generally treated as rider-induced wear and is not covered, whereas a genuine internal temperature sensor or motor failure inside the standard two-year warranty window is normally covered by Bosch.
Typical cost: A clean-and-cool owner fix costs nothing, dealer diagnostics typically run €40–€80, a firmware reflash with sensor verification is €30–€60, and a full drive unit replacement where required is €600–€900 including labour.

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 0x540022?

There is no manual reset button for this code; the system clears it automatically once the drive unit cools below its threshold and you power the bike back on. If the motor is still hot, restarting will bring the fault straight back. A Bosch dealer can also clear stored codes through DiagnosticTool after confirming the unit is healthy.

Is it safe to keep riding with this error active?

The motor support is disabled but the bicycle still rolls and pedals normally under your own power, so coasting downhill or freewheeling home is safe. Climbing, towing a trailer or pulling away from traffic lights should be avoided because the motor cannot assist. Repeatedly loading the bike while the unit is hot risks damage to the motor windings and insulation.

How much will the repair cost and is it covered by warranty?

An owner-side cool-down and clean is free, dealer diagnostics are usually €40–€80, and a replacement drive unit fitted is €600–€900. Genuine internal Bosch component failures within the two-year warranty period are normally covered, but overheating traced to heavy rider load or sustained climbing is treated as wear.

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.