Torque sensor wire for 2017, 2018, and 2019 Surface 604 eBikes. This wire connects the torque sensor to the controller, carrying the pedal-force data that enables proportional electric assist.
A damaged, corroded, or loose sensor wire can cause intermittent assist, error codes, or complete loss of pedal-assist functionality. If you have ruled out the sensor and controller as the issue, the wire itself may be the culprit.
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