Amflow: Bike power motor restricted, Speed sensor error

[Pentti]

My Problem was solved by mounting 1 mm spacers between signal disc and brake disc to narrow the distance to speed sensor. Obviously this tolerance is quite crucial, running a different wheel with slightly different disc position can cause this issue. Should be mentioned in the manual imho.

Thanks for the update @thaeber I take it you were on non-amflow wheel?

 

[TonTonUB]

Had the same error three times.
Each time, i have had to tighten my rear axle, who was very very slightly loose.
Problem solved (till now, after many many weeks).

 

[TWI]

I had this error appear yesterday on my Megamo Reason CRB03. Was a long slog back to the van. I have not been riding in the rain, just some wet tracks but nothing unusual, not ever used a pressure washer on it and only had the bike 3 weeks and ridden a total of 130miles. I checked the rotor, spacing, torque and wiring, all good. Took it to the dealership this morning who said they had not seen this issue before on the Megamo. They have always been pro-active in how they deal with issues in the past so will update as I hear from them about the prognosis and fix. I am missing the bike already...

 

[Fordy1010]

I had this error appear yesterday on my Megamo Reason CRB03. Was a long slog back to the van. I have not been riding in the rain, just some wet tracks but nothing unusual, not ever used a pressure washer on it and only had the bike 3 weeks and ridden a total of 130miles. I checked the rotor, spacing, torque and wiring, all good. Took it to the dealership this morning who said they had not seen this issue before on the Megamo. They have always been pro-active in how they deal with issues in the past so will update as I hear from them about the prognosis and fix. I am missing the bike already...

Any update on this?

 

[TWI]

Any update on this?

Yes, a new speed sensor solved the issue. Cleaned rotor and sensor, unplugged and re-plugged at motor, still issue, Magamo sent new speed sensor, installed and now runs as it should.

 

[Fordy1010]

Yes, a new speed sensor solved the issue. Cleaned rotor and sensor, unplugged and re-plugged at motor, still issue, Magamo sent new speed sensor, installed and now runs as it should.

Cheers, mine is back in the shop at the moment but hopefully it's a simple fix like this

 

[Rovershack]

I will second the spacer fix. Avinox states the clearance for the sensor to ring should be 1-3mm. I have Magura two piece rotors, which have a pretty thick mounting point, but I started getting this error on my third ride on my new Crestline 181.2. I looked at the gap, and it looked to be maybe 2-2.5 mm. I picked up some stainless steel 5mm bolt washers, which are approximately 1mm think. Mounted them between the rotor and the sensor ring. While I only have one ride on this fix, it appears to have done the trick. The gap to the ring looks to be pretty close to 1mm, didn't actually measure it as it's hard to get a gapping measurement tool in there. Will update if it reappears.

 

[Trevor355]

Hello everyone,

I wanted to share a frustrating issue I'm experiencing with my new DJI Amflow PL Carbon e-bike in the hope of raising awareness within the community and documenting the support process for others.

I don't want to blame anyone, I just want to share the problem I'm having with a bike that's less than a month old, and how it's being solved by the manufacturer, its warranty service, and the dealer where I bought it. Everyone can draw their own conclusions.

I bought my bike just a month ago (23.07.2025) from an official dealer. For the first 400 kilometers, the bike was an absolute joy to ride—pure perfection.

Less than a month from purchase day, on 19.08.2025 everything changed. While on a ride, I suddenly felt a significant and sharp drop in motor power. The display showed the error "Bike power motor restricted," and the DJI app notified me with a "speed sensor error." At the same time, the speed reading on the display started showing random, fluctuating numbers.

I've tried restarting the bike, which temporarily resolves the issue, but the error always returns shortly after.

What's incredibly frustrating is that this is a brand new, premium bike, and I'm already dealing with a core technical fault. I've performed the basic checks myself, confirming that the speed sensor and the magnet on the wheel appear to be correctly aligned and that the cable looks fine.

I'm scheduled to bring the bike to the service center to have it professionally diagnosed. I am creating this thread to let you all know that this problem exists. I will provide regular updates here on how DJI's customer support and the service center handle this under warranty.

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I know a long time has passed from this fault but I have just experienced the same. The fault came and went and then became more frequent, eventually permanent. On close inspection I discovered the axle nut had come loose, increasing the gap to the sensor and rotor. Tightened this up and it seems to have cured the problem