Home › Tongsheng TSDZ2 › Error E02
Tongsheng TSDZ2 error E02: Torque sensor error
Tongsheng TSDZ2 / TSDZ2B mid-drive with VLCD5, VLCD6 or XH18 displayDealer neededRide with caution
The TSDZ2 controller reads no or an implausible signal from the torque sensor in the bottom bracket. Assist is weak, erratic or absent. The most common code on a TSDZ2 after water gets in or after the motor was opened.
Likely causes
- Pressure on the pedals during power-up (the sensor zeroes at start)
- Water in the motor housing reaching the torque sensor board
- Torque sensor cable or connector inside the motor damaged or unplugged
- Torque sensor failed
- Motor firmware (open source) needing a torque sensor calibration
How to fix Tongsheng TSDZ2 error E02
- Switch off, take your feet off the pedals, switch on and wait a few seconds
- Check the motor is dry; if water got in, open, dry and seal it (silicone at the cable exits)
- Open the motor and check the torque sensor connector is seated
- On open-source firmware, run the torque sensor calibration
- Replace the torque sensor (a shop job unless you are comfortable opening the motor)
Go to a dealer if: Go to a shop if a dry, connected sensor still shows E02; the sensor needs replacing.
Warranty: TSDZ2 kits are usually covered 1 year by the reseller; motor and torque sensor faults are typical claims, water damage is not.
Typical cost: Torque sensor EUR/USD 40-80 plus 1-2 hours of labour.
Warranty: TSDZ2 kits are usually covered 1 year by the reseller; motor and torque sensor faults are typical claims, water damage is not.
Typical cost: Torque sensor EUR/USD 40-80 plus 1-2 hours of 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 TSDZ2 E02?
Power cycle with no load on the pedals.
Can I keep riding?
Pedalling without assist is fine; some firmware still allows throttle.
Warranty?
Yes for a failed sensor; water ingress is typically excluded.
Related Tongsheng TSDZ2 codes
Not an official Tongsheng TSDZ2 document. Compiled from workshop experience and public service information; details can differ per system version and bike brand.