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Bosch error 0x550355: Short circuit on the 12 V outlet

Bosch eBike (DiagnosticTool / eBike Flow hex code)Dealer neededSafe to keep riding

The Bosch system has detected a short circuit on the 12 V accessory outlet. Power to that outlet is cut to protect the wiring, so any device plugged in there stops working until the short is cleared. The main drive, motor support, and display remain unaffected, so the eBike stays rideable in the meantime.

Drive system	Bosch eBike (DiagnosticTool / eBike Flow hex code)
Severity	Dealer needed
Keep riding?	Safe to keep riding
Typical cost	Expect €30–€90 for diagnostic time at a Bosch workshop and €60–€180 if the 12 V harness or outlet needs replacing, parts included.

Likely causes

Faulty aftermarket accessory on the 12 V outlet (light, GPS, phone charger, USB hub)
Damaged cable insulation or pinched wire on the 12 V harness feeding the outlet
Moisture or corrosion inside the outlet connector or its plug
Bent, loose, or partially unseated connector pin on the outlet or accessory lead
Accessory drawing more current than the 12 V outlet is rated for

How to fix Bosch error 0x550355

Pull over safely and power the eBike system off.
Unplug every device currently connected to the 12 V outlet.
Inspect the outlet and plug for moisture, bent pins, scorch marks, or debris; clean and dry if damp.
Leave the outlet empty, power the bike back on, and check whether the code clears.
Plug each accessory back in one at a time to identify which one triggers the short.
If the fault returns with nothing connected to the outlet, the harness or outlet itself is shorted and a Bosch dealer must diagnose it.

Go to a dealer if: A Bosch dealer is required if the error returns with no consumer attached, which means the short is inside the wiring, connector, or outlet on the bike.
Warranty: A genuine 12 V outlet or harness failure inside the two-year Bosch warranty is normally covered, while short circuits caused by third-party accessories, water ingress, or crash damage are billed to the owner.
Typical cost: Expect €30–€90 for diagnostic time at a Bosch workshop and €60–€180 if the 12 V harness or outlet needs replacing, parts included.

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 0x550355?

Power the bike off, unplug every accessory from the 12 V outlet, then switch the system back on. If the short was in an attached device the code clears on the next power-up; if it returns with nothing plugged in the harness or outlet itself is at fault.

Is it safe to keep riding with this fault?

Yes, the motor, drive, and display stay operational and only the 12 V accessories lose power. Continue riding if lighting and charging are not needed, and resolve the fault before any night ride or longer tour.

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

Bosch dealers charge €30–€90 for diagnosis and €60–€180 when the harness or outlet needs replacement, parts included. A genuine Bosch fault inside the two-year warranty is covered; shorts caused by third-party accessories or water ingress are not.

Related Bosch codes

0x503001 · Speed sensor signal missing or invalid 0x511001 · Acceleration sensor failure in the drive unit 0x520001 · ABS component not recognised by drive unit 0x520002 · ABS component recognised without configuration

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.