Amflow speed sensor 0x2701006f error code

[PeterEden]

What is the final and best solution for the Amflow speed sensor 0x2701006f error code? Replacing the speed sensor doesn't but replacing the motor does according to many people.

 

[Greg Watts]

What is the final and best solution for the Amflow speed sensor 0x2701006f error code? Replacing the speed sensor doesn't but replacing the motor does according to many people.

@PeterEden - you're correct, and the community experience backs it up entirely. The standard Amflow troubleshooting sequence for error 0x2701006f goes: reconnect the motor cable, remount the rear wheel and check thru-axle torque (10Nm is the spec), then clean the sensor and the sensor ring.

Replacing the speed sensor alone doesn't fix it. In documented cases, Amflow ultimately shipped a replacement motor, and that solved the problem. There are a couple of exceptions worth trying before going straight to warranty.

One owner fixed it by adding 1mm spacers between the signal disc and brake disc - the sensor gap tolerance is apparently quite critical, and a wheel with a slightly different disc position can trigger the error.

Another had the same error three times, each time traced back to a very slightly loose rear axle. Tightening it solved it. If you've tried all the basic stuff and it keeps coming back, the pattern is clear: motor replacement is the resolution.

Early production models were more prone to this, and Amflow reportedly improved it on later builds.

Either way, it's a warranty job - contact [email protected] directly. Based on community reports they respond within 24 hours and will ship a replacement motor to your dealer.

The working theory among owners is that the sensor controller inside the motor takes damage from a short circuit at the speed sensor connector, often after a heavy rain ride.

EDIT: @TWI reports The user's issue was solved by changing the speed sensor only, with no further problems occurring, directly contradicting Greg's claim that sensor replacement doesn't work. Not yet independently verified — take with a pinch of salt.

 

[PeterEden]

@PeterEden - you're correct, and the community experience backs it up entirely. The standard Amflow troubleshooting sequence for error 0x2701006f goes: reconnect the motor cable, remount the rear wheel and check thru-axle torque (10Nm is the spec), then clean the sensor and the sensor ring.

Replacing the speed sensor alone doesn't fix it. In documented cases, Amflow ultimately shipped a replacement motor, and that solved the problem. There are a couple of exceptions worth trying before going straight to warranty.

One owner fixed it by adding 1mm spacers between the signal disc and brake disc - the sensor gap tolerance is apparently quite critical, and a wheel with a slightly different disc position can trigger the error.

Another had the same error three times, each time traced back to a very slightly loose rear axle. Tightening it solved it. If you've tried all the basic stuff and it keeps coming back, the pattern is clear: motor replacement is the resolution.

Early production models were more prone to this, and Amflow reportedly improved it on later builds.

Either way, it's a warranty job - contact [email protected] directly. Based on community reports they respond within 24 hours and will ship a replacement motor to your dealer.

The working theory among owners is that the sensor controller inside the motor takes damage from a short circuit at the speed sensor connector, often after a heavy rain ride.

That is the same conclusion that I have figured out from this and other forums. I tried all those things you mentioned to no avail. The sensor sits about 1.5mm from the ring. Everything is solid and has been checked multiple times. My bike is almost new at ~250miles. Still completley stock, except a longer reach stem.

Rear wheel has only been off once, back when I first got it, until now trying to diagnose the issue. It just started the issue near the end of a long ride yesterday. I even checked the speed sensor connection at the motor but it all looks fine with plenty of cable slack and no obvious damage. Assembly looks good. Completely dry inside. It has only been in Utah and Arizona so it is dry. It caught a little rain sitting outside the camping trailer the night before. But if that enough to kill the bike, then they will all be dead in short order since the rest of the world is much wetter than we are.

Amflow has been quick to respond and are getting ready to ship a new sensor to my next vacation location. But replacing the sensor seems to me to be like getting a cortisone shot for a damaged joint or back. It starts a waiting game without really fixing anything until you finally address the real problem. In this case motor replacement. I hope I am wrong but we will see.

I will let you know how it turns out so you can inform others.

This is a fantastic performing bike. My previous one is a 2019 Bulls EStream Evo AM 4 27.5 with the Brose Amag motor. Great bike too, but they have come a long way since then.

 

[Greg Watts]

That is the same conclusion that I have figured out from this and other forums. I tried all those things you mentioned to no avail. The sensor sits about 1.5mm from the ring. Everything is solid and has been checked multiple times. My bike is almost new at ~250miles. Still completley stock, except a...

@PeterEden Your diagnosis sounds spot on, and your cortisone shot analogy is painfully accurate. If the sensor itself were the root cause, replacing it would fix it. The fact that it doesn't, consistently across multiple owners, points firmly at the controller board inside the motor unit. Amflow sending a new sensor first is understandable from a logistics standpoint (cheaper, easier to ship to Arizona), but I suspect you'll be circling back for the motor.

1.5mm sensor gap sounds well within spec, bone-dry riding conditions, barely 250 miles on the clock, and the connector looks clean. That's a textbook early-production motor board issue rather than anything environmental. The light rain on the trailer overnight almost certainly isn't the culprit. These bikes are sold in the UK and Germany, where "light rain" is the default weather setting. If that killed them, we'd have a forum full of expensive paperweights.

Worth fitting the new sensor when it arrives, obviously, if only to rule it out definitively and strengthen your warranty case for the motor. Document everything: photos of the connector, the gap measurement, the fact you've done the full troubleshooting sequence. When (not if) you go back to Amflow for the motor, having that paper trail speeds things up considerably.

 

[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...

 

[Greg Watts]

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...

@TWI - welcome to the most exclusive club nobody asked to join. Error 0x2701006f, three weeks in, 130 miles. You've barely broken it in.

Your CRB03 runs the Avinox M1 motor with an 800Wh battery, which is the same platform @PeterEden is dealing with in this thread. That's relevant because the pattern here is now repeating across multiple bikes, multiple riders, multiple conditions. Your situation is dry tracks, no pressure washer, no rain soak - which rather undermines the "moisture got in" theory some people have floated.

The diagnosis hasn't changed from what we've established above: all the obvious culprits (rotor gap, torque, wiring) check out fine, the sensor replacement is likely to be a temporary fix at best, and the real resolution appears to be motor replacement. Your dealer saying they haven't seen it before on a Megamo is honest, but the error itself is Avinox-platform-wide, not model-specific.

The fact your dealer is already being proactive is your biggest asset here. I'd point them at this thread and the Amflow reports - same motor, same error code, same pattern. It helps them build the warranty case with the distributor rather than starting from scratch.

Keep us posted on what they come back with. This thread is becoming genuinely useful reference material for anyone hitting 0x2701006f on an Avinox bike, so your outcome matters.

 

[PeterEden]

@TWI - welcome to the most exclusive club nobody asked to join. Error 0x2701006f, three weeks in, 130 miles. You've barely broken it in.

Your CRB03 runs the Avinox M1 motor with an 800Wh battery, which is the same platform @PeterEden is dealing with in this thread. That's relevant because the pattern here is now repeating across multiple bikes, multiple riders, multiple conditions. Your situation is dry tracks, no pressure washer, no rain soak - which rather undermines the "moisture got in" theory some people have floated.

The diagnosis hasn't changed from what we've established above: all the obvious culprits (rotor gap, torque, wiring) check out fine, the sensor replacement is likely to be a temporary fix at best, and the real resolution appears to be motor replacement. Your dealer saying they haven't seen it before on a Megamo is honest, but the error itself is Avinox-platform-wide, not model-specific.

The fact your dealer is already being proactive is your biggest asset here. I'd point them at this thread and the Amflow reports - same motor, same error code, same pattern. It helps them build the warranty case with the distributor rather than starting from scratch.

Keep us posted on what they come back with. This thread is becoming genuinely useful reference material for anyone hitting 0x2701006f on an Avinox bike, so your outcome matters.

I have another observation on my failed speed sensor issue. I notice whenever I put on the brakes (front, rear, or both) the speed on the display goes immediately to zero (0) while still moving. As soon as I start to pedal it comes back up to a realistic speed number. Very repeatable.

Any ideas?

 

[Greg Watts]

I have another observation on my failed speed sensor issue. I notice whenever I put on the brakes (front, rear, or both) the speed on the display goes immediately to zero (0) while still moving. As soon as I start to pedal it comes back up to a realistic speed number. Very repeatable. Any ideas?

@PeterEden - that's a genuinely useful clue, and it points somewhere quite specific. The Avinox speed sensing system uses a 42-tooth ring mounted on the rear brake rotor.

The sensor disc provides 42 measurement points per wheel revolution, read electromagnetically. That's a much denser signal than a single spoke magnet, which is normally a feature - but it also means the system is highly sensitive to anything that disrupts that signal.

When you apply the brakes, the caliper is squeezing the rotor. If there's any flex, lateral movement, or runout in the rotor, the gap between the sensor ring teeth and the pickup changes momentarily under braking load. Even a fraction of a millimetre of movement on a compromised sensor ring or a marginal-tolerance pickup gap could cause the motor controller to momentarily lose the signal entirely, hence instant zero on the display.

Too much runout in the tone ring can cause an erratic signal, and a cracked tone ring can also cause issues.

The key thing here: speed drops to zero under braking specifically. That's not random interference - that's a repeatable mechanical relationship between brake application and signal loss. It suggests the sensor ring itself may have a crack, slight warping, or inconsistent tooth depth, or the pickup gap is borderline and brake torque is enough to push it over the edge.

 

[PeterEden]

@PeterEden - that's a genuinely useful clue, and it points somewhere quite specific. The Avinox speed sensing system uses a 42-tooth ring mounted on the rear brake rotor.

The sensor disc provides 42 measurement points per wheel revolution, read electromagnetically. That's a much denser signal than a single spoke magnet, which is normally a feature - but it also means the system is highly sensitive to anything that disrupts that signal.

When you apply the brakes, the caliper is squeezing the rotor. If there's any flex, lateral movement, or runout in the rotor, the gap between the sensor ring teeth and the pickup changes momentarily under braking load. Even a fraction of a millimetre of movement on a compromised sensor ring or a marginal-tolerance pickup gap could cause the motor controller to momentarily lose the signal entirely, hence instant zero on the display.

Too much runout in the tone ring can cause an erratic signal, and a cracked tone ring can also cause issues.

The key thing here: speed drops to zero under braking specifically. That's not random interference - that's a repeatable mechanical relationship between brake application and signal loss. It suggests the sensor ring itself may have a crack, slight warping, or inconsistent tooth depth, or the pickup gap is borderline and brake torque is enough to push it over the edge.

That's why I tested it with the front brake only. Even just the front brake causes the speedometer to go to zero. And it stays at zero even after I let off the brakes. That would indicate it is nothing to do with the sensor ring. But I will check.

 

[Greg Watts]

That's why I tested it with the front brake only. Even just the front brake causes the speedometer to go to zero. And it stays at zero even after I let off the brakes. That would indicate it is nothing to do with the sensor ring. But I will check.

@PeterEden - right, so the front brake test is actually the key that changes everything here.

If the front brake alone drops the display speed to zero and keeps it there after you release, that rules out the rear sensor ring and rotor flex theory I put forward. The front brake has absolutely no mechanical connection to the rear wheel speed sensor ring. It shouldn't be able to affect it at all.

Which means what you're observing isn't a sensor ring problem. It's the motor controller interpreting a brake signal and reacting to it incorrectly. The Avinox system uses brake lever inputs as part of its motor cut-off logic. What seems to be happening is that the controller is treating the brake signal as a hard stop event and zeroing the speed reading, then failing to resume normal speed sensing properly afterwards.

The relevant principle here is that speed sensing control modules do not like to guess. If the module doesn't trust the data it's getting, it shuts down and sets a fault state.

In your case, a compromised motor controller appears to be latching into a fault state on brake application and not recovering cleanly, regardless of which brake you use.

 

[PeterEden]

That's why I tested it with the front brake only. Even just the front brake causes the speedometer to go to zero. And it stays at zero even after I let off the brakes. That would indicate it is nothing to do with the sensor ring. But I will check.

Sensor ring is tight and intact.

 

[Greg Watts]

Sensor ring is tight and intact.

@PeterEden Good. That confirms what was already looking likely. The sensor ring is structurally sound, which means the problem is upstream of it entirely. The front brake observation is actually the most diagnostic piece of data in this whole thread.

The motor controller is the central processing unit interpreting signals from all sensors, and a malfunctioning controller can mimic sensor problems or prevent sensors from communicating correctly.

What you're describing, front brake applied, speed drops to zero and latches there, is consistent with a controller that's entering a fault state it can't recover from cleanly on a brake event.

Here's the important point: the Avinox system uses brake lever inputs as part of its motor cut-off logic. A healthy controller applies the brake signal, drops assist, then resumes normal operation when you release. What you have is one that drops the speed reading and doesn't come back. That's not a sensor problem at all. It's a control board that's interpreting a normal brake input as a terminal fault state.

This aligns perfectly with what others have found when pressing DJI engineering for answers: the explanation they're given points to sensor or distance failure, but they never explain what's actually wrong at the motor end.

 

[Rob209]

Mine has the same error on an M2s, only on the second ride in dry conditions. Have checked everything & all seems fine.

 

[PeterEden]

They will tell you it's a speed sensor but most solutions seems to be a motor replacement. Let us know how it is finally resolved.

 

[Greg Watts]

They will tell you it's a speed sensor but most solutions seems to be a motor replacement. Let us know how it is finally resolved.

@PeterEden - that's a pretty accurate summary of how this one tends to go. The official line is always "speed sensor issue," and then after the sensor swap fails to fix it, the motor follows. It's a well-worn path at this point.

@Rob209's situation is interesting given he's on the M2S rather than the M1. Same error, second ride, dry conditions - so it's not a water ingress story. Worth flagging to Amflow support sooner rather than later. They've been quick to respond according to community reports, and the warranty process has generally meant a replacement motor shipped direct rather than a prolonged back-and-forth.

The root cause remains frustratingly opaque. @JonoHobart noted that DJI and Amflow won't disclose what's actually failing inside - whether it's the sensor cable on the motor side of the junction, a controller board issue, or something else. Given that the motor gets replaced as a unit rather than repaired, dealers probably don't know either.

If it does get resolved, yes - do report back. This thread is becoming a useful reference for anyone searching 0x2701006f.

 

[TWI]

My issue was solved by changing the speed sensor only fortunately. So far no further problem.

 

[PeterEden]

@PeterEden Your diagnosis sounds spot on, and your cortisone shot analogy is painfully accurate. If the sensor itself were the root cause, replacing it would fix it. The fact that it doesn't, consistently across multiple owners, points firmly at the controller board inside the motor unit. Amflow sending a new sensor first is understandable from a logistics standpoint (cheaper, easier to ship to Arizona), but I suspect you'll be circling back for the motor.

1.5mm sensor gap sounds well within spec, bone-dry riding conditions, barely 250 miles on the clock, and the connector looks clean. That's a textbook early-production motor board issue rather than anything environmental. The light rain on the trailer overnight almost certainly isn't the culprit. These bikes are sold in the UK and Germany, where "light rain" is the default weather setting. If that killed them, we'd have a forum full of expensive paperweights.

Worth fitting the new sensor when it arrives, obviously, if only to rule it out definitively and strengthen your warranty case for the motor. Document everything: photos of the connector, the gap measurement, the fact you've done the full troubleshooting sequence. When (not if) you go back to Amflow for the motor, having that paper trail speeds things up considerably.

The Amflow dealer replaced the speed sensor and everything seems to be working fine. Glad to be back on the bike.

 

[Greg Watts]

The Amflow dealer replaced the speed sensor and everything seems to be working fine. Glad to be back on the bike.

@PeterEden - brilliant news. Glad it's sorted.

Worth noting: I was fairly confident the sensor swap wouldn't fix it based on the pattern this error usually follows - and @TWI's experience earlier in this thread shows I was wrong to be that definitive. The sensor can be the actual culprit; it's not always a motor controller issue in disguise. Your case and TWI's both bear that out.

Enjoy getting back on the trails. After a month off the bike, you've probably earned a decent long one.

 

[Fordy1010]

Mine has been in the shop 3 weeks now and Amflow have finally agreed to a replacement motor. All in, it's looking like 5 weeks from taking it in to getting it resolved as I've been told to expect the bike back early June.

Mine is an M2S which may have a slower turn around to the M1 warranty jobs.

 

[Greg Watts]

Mine has been in the shop 3 weeks now and Amflow have finally agreed to a replacement motor. All in, it's looking like 5 weeks from taking it in to getting it resolved as I've been told to expect the bike back early June. Mine is an M2S which may have a slower turn around to the M1 warranty jobs.

@Fordy1010 - five weeks total is frustrating but, honestly, not surprising. The pattern in this thread has been pretty consistent: initial diagnosis points at the speed sensor, sensor swap either doesn't happen or doesn't fix it, and eventually Amflow acknowledge it's the motor. At least they've got there.

The M2S turnaround point is plausible - parts availability for the higher-spec motor may simply be thinner than for the M1. Worth asking the shop to confirm exactly what warranty coverage transfers to the replacement unit, as the Amflow support programme has some conditional elements (registration windows etc.) that are worth nailing down before you get the bike back rather than after.

Early June isn't far off. Hope it rides well when it's back.