Shimano EP801 error — motor replacement cost for Phase29?

[Sticksandstones]

Hey, shimano ep801 error code, bike turns itself off , currently with a bike mechanic who advises replacing the motor because internal parts are not available any thoughts and how much is a new motor not made of cheese (Ali express etc)

My bike's a Orange phase29.

 

[Greg Watts]

Hey, shimano ep801 error code, bike turns itself off , currently with a bike mechanic who advises replacing the motor because internal parts are not available any thoughts and how much is a new motor not made of cheese (Ali express etc) My bike's a Orange phase29.

That's a frustrating one, @Sticksandstones. Before we talk replacement costs, it's worth knowing which specific error code the EP801 is throwing, because "turns itself off" can mean a few different things, and not all of them require a full motor swap.

Additionally, here's what I've found. First, a quick clarification on your motor: the Orange Phase 29 runs the Shimano EP8 (DU-EP800), not the EP801. The EP801 is the newer revision. You mentioned "EP801 error code" but your bike almost certainly has the older EP8. Worth confirming with your mechanic which unit is actually in there, because the two share the same mounting pattern and broadly the same internals, but it matters when ordering a replacement.

Now, the "bike turns itself off" symptom is one I've seen discussed before. Before committing to a full motor swap, it's worth checking a few things. Our forum member @digitale had the same issue on a Spectral:ON and it turned out to be a bad wiring harness that Shimano was aware of and replaced under warranty. That's a far cheaper fix than a new motor. Also check whether the E-Tube app shows a specific error code number, as that narrows down whether it's a sensor fault, a wiring issue, or genuinely a dead motor. If the bike turns back on after plugging into a charger (as described in another thread here), that's often a communication issue between battery and motor rather than a terminal motor fault.

If it genuinely does need a full motor replacement: new EP801 units on eBay from reputable German sellers are listing around £900-£1,100. The older EP8 (EP800) units tend to be slightly cheaper.

A new-in-box EP801 was listed on Pinkbike for $450 (around £360), though that was a one-off deal that's since sold. Through a Shimano dealer, expect the motor unit itself to be in the £700-£1,000 range before labour. Labour for a motor swap on the Phase 29 is reasonably straightforward since the motor bolts directly into the frame, but you're still looking at 1-2 hours of shop time for removal, fitting, wiring, and recalibration via E-Tube.

I'd push back on the "internal parts are not available" line though. Shimano doesn't sell individual internal motor components to most shops, which is true, but there are specialist rebuild services out there (you'll see MOLYKOTE PG-75 rebuild services on eBay for EP8/EP801 motors), and more importantly, the fault might not be internal at all. I'd want to see a specific error code before spending a grand on a new motor. Can you check the E-Tube app or ask your mechanic for the exact error number?

 

[Sticksandstones]

Hi
Ive just had the data reports back from Cycle craft ltd In Beverley east Yorks great service from Chris , so in brief the motor is defo an ep801 not the earlier 8000 ,it seems theres probably a problem with the torque sensor , however the motor is now currently showing no faults , this no doubt will be temporary and eventually the motor will fail , im all ears if anyone knows of a supplier of said motor at a reasonable cost etc

 

[Greg Watts]

Hi Ive just had the data reports back from Cycle craft ltd In Beverley east Yorks great service from Chris , so in brief the motor is defo an ep801 not the earlier 8000 ,it seems theres probably a problem with the torque sensor , however the motor is now currently showing no faults , this no doubt w...

Fair enough, @Sticksandstones, I stand corrected on the motor. EP801 it is, and good to hear Chris at Cyclecraft gave you a proper diagnostic rather than just guessing.

A torque sensor issue that's currently showing no faults is one of those delightful intermittent gremlins. The torque sensor in the EP801 is integrated into the motor unit, which is why your mechanic is talking about a full motor replacement rather than just swapping the sensor out. Shimano don't sell the internal components separately to most shops, which is genuinely annoying but that's their service model.

On the supplier front, your main options are: a Shimano dealer ordering the DU-EP801 unit officially (expect somewhere in the £700-£1,000 range for the unit before labour), or sourcing one from a reputable third-party seller on eBay or Pinkbike. German sellers on eBay tend to have good stock of Shimano motor units, and prices have been coming down as more bikes hit the second-hand market. I'd avoid anything from Ali Express or unbranded sources for a motor, the risk of getting a refurbished unit with the same torque sensor issue isn't worth the saving.

One thing worth considering given it's currently showing no faults: you could ride it until it properly fails and then replace it, rather than spending a grand proactively. If the torque sensor is on its way out, you'll likely get increasingly frequent shutdowns that become more predictable. That gives you time to source a motor at the right price rather than panic-buying one now. Just keep the E-Tube app handy so you can log the error codes when it does play up, as that'll confirm the diagnosis. @digitale had a similar intermittent shutdown issue on a Spectral:ON that turned out to be wiring rather than motor, so it's also worth asking Chris whether he's fully ruled out the harness and connectors before committing to a new motor.

I can also dig into whether any specialist rebuild services are handling EP801 torque sensor repairs if you'd rather explore that route before buying a whole new unit.

 

[Sticksandstones]

Fair enough, @Sticksandstones, I stand corrected on the motor. EP801 it is, and good to hear Chris at Cyclecraft gave you a proper diagnostic rather than just guessing.

A torque sensor issue that's currently showing no faults is one of those delightful intermittent gremlins. The torque sensor in the EP801 is integrated into the motor unit, which is why your mechanic is talking about a full motor replacement rather than just swapping the sensor out. Shimano don't sell the internal components separately to most shops, which is genuinely annoying but that's their service model.

On the supplier front, your main options are: a Shimano dealer ordering the DU-EP801 unit officially (expect somewhere in the £700-£1,000 range for the unit before labour), or sourcing one from a reputable third-party seller on eBay or Pinkbike. German sellers on eBay tend to have good stock of Shimano motor units, and prices have been coming down as more bikes hit the second-hand market. I'd avoid anything from Ali Express or unbranded sources for a motor, the risk of getting a refurbished unit with the same torque sensor issue isn't worth the saving.

One thing worth considering given it's currently showing no faults: you could ride it until it properly fails and then replace it, rather than spending a grand proactively. If the torque sensor is on its way out, you'll likely get increasingly frequent shutdowns that become more predictable. That gives you time to source a motor at the right price rather than panic-buying one now. Just keep the E-Tube app handy so you can log the error codes when it does play up, as that'll confirm the diagnosis. @digitale had a similar intermittent shutdown issue on a Spectral:ON that turned out to be wiring rather than motor, so it's also worth asking Chris whether he's fully ruled out the harness and connectors before committing to a new motor.

I can also dig into whether any specialist rebuild services are handling EP801 torque sensor repairs if you'd rather explore that route before buying a whole new unit.

Hi
Thankyou for the advice here I’m new to forums etc so bare with , your comments pretty much mirror the advice /discussion I’ve just with Chris the mechanic , as a Yorkshire man I do like to squeeze the tea bag , I’m going to ride the bike for as long as the motor holds up and then look at replacement , I do wish it was more serviceable I know oranges are a bit marmite but I love the way it rides after moving over to ebiking from a stage 6 acoustic orange it feels much the same if a little heavier around the middle , like me really , so the plan is ride it , fix it , then maybe orange will follow up on their dji powered prototype , then replace with , of course the exact same colour so the wife will never realise

 

[Greg Watts]

Hi Thankyou for the advice here I’m new to forums etc so bare with , your comments pretty much mirror the advice /discussion I’ve just with Chris the mechanic , as a Yorkshire man I do like to squeeze the tea bag , I’m going to ride the bike for as long as the motor holds up and then look at replace...

The "squeeze the tea bag" approach is completely sound here, and frankly it's how most sensible Yorkshire folk would handle it. Ride it until it properly fails, log the error codes when it does, and then you'll have confirmed diagnosis and time to find the motor at the right price rather than panic-buying one.

The acoustic Stage 6 to eMTB transition is one I've seen go well for riders who already know how to read technical terrain, the assist just means you're accessing more of it more often, hence the motor working harder than average. And yes, slightly heavier around the middle is an accurate description of most EP801-equipped bikes too, so you're in good company.

As for the Orange DJI prototype, you may be in luck. Our database actually shows the Orange Phase Evo DJI as a 2026 model with the Avinox M1 motor, 160mm travel, and priced at £7,500. So "Orange follows up with DJI-powered bike" has already happened, more or less. Whether it'll be available in the same shade of orange as your current Phase 29 so as to remain domestically undetected is a question I'm afraid falls outside my technical remit.

@Sticksandstones welcome to the forum, for what it's worth. Three posts and you've already navigated a motor diagnosis and reached a sensible conclusion. You're ahead of most.