Dapu error 15: Lost communication between display and controller
The display has stopped receiving valid data from the motor controller over the wired link for an extended period. As a result, pedal assist cuts out, the speed reading may freeze or drop to zero, and walk assist is unavailable. The system disables the drive to protect components until the fault is cleared.
| Drive system | Dapu controller (used by Pedego, Batavus, Koga and other European brands) |
| Severity | Fix at home |
| Keep riding? | Do not keep riding |
| Typical cost | Expect roughly €15-40 for a replacement LCD cable, €60-180 for an LCD and €250-450 for a controller, plus around €60-120 of workshop labour for diagnosis and fitting. |
Likely causes
- LCD display cable not fully seated at the display or controller end
- Damaged or pinched LCD cable, often chafed at the head tube or under the stem
- Corroded or wet connector pins in the display harness
- Faulty LCD display module that no longer responds on the comms line
- Faulty controller with a failed comms output to the display
- A 5 V short inside the harness or one of the connectors pulling the comms line down
How to fix Dapu error 15
- 1. Switch the system off and remove the battery before any inspection.
- 2. Unplug the LCD cable at both the display and the controller and inspect the pins for bent, pushed-back, dirty or green-contaminated contacts.
- 3. Re-seat both connectors firmly, route the cable clear of the head tube and any pinch points, then power up and test.
- 4. If the code returns, swap the LCD cable for a known-good replacement of the same type.
- 5. If still present, substitute a known-good LCD or controller to identify which side has failed.
- 6. With the battery removed, meter the harness for a 5 V short to ground and repair or replace any affected wiring.
- 7. Hand the bike to a dealer if the fault persists, as further diagnosis requires controller-level tooling.
Warranty: A genuine LCD, cable or controller failure inside the typical two-year warranty period is normally covered as a component fault, while damage from water ingress, crash, impact or rodent-chewed wiring is treated as wear or misuse and is excluded.
Typical cost: Expect roughly €15-40 for a replacement LCD cable, €60-180 for an LCD and €250-450 for a controller, plus around €60-120 of workshop labour for diagnosis and fitting.
Frequently asked
Can I reset dapu error 15?
No permanent reset exists. Switching the system off and back on clears the code only if the underlying wiring fault has been resolved, and the warning returns as soon as the display loses comms again.
Is it safe to keep riding with dapu error 15?
No. Assist, throttle and walk mode are disabled while the fault is active, so the bike behaves like an unpowered bicycle with extra weight. Power-cycling on the road to clear the code can mask an intermittent short that may damage the controller.
How much does it cost to fix dapu error 15?
If the cable is at fault, repair usually runs €15-40 plus fitting, a failed LCD €60-180 and a controller €250-450. A genuine component failure inside the first two years is normally covered by warranty, but water or crash damage is not.
Related Dapu codes
Official source: Dapu controller error chart, Pedego dealer service guide
Not an official Dapu document. Compiled from workshop experience and public service information; details can differ per system version and bike brand.