My guess is a wiring harness or M25 connection issue causing excessive resistance in the high current motor circuit.
Itās a good guess. M25 can be rectified with the springs or possibly with some dielectric grease.
Springs might fix it, but I think there is an inherent manufacturing issue that allows the connectors to spread and reduce connectivity. This has been there but the higher current draw amplifies the condition.
Iām running into the same issue with the Pro Module. I received the springs from āYarboā today. I need to say, āReally, A 1 mm spring (or smaller) shuts down the Pro Moduleā. I wonāt known if it fixes the issues or not. The next three days are light rain, rain, some rain and more rain and more rain than 10 mins ago. The weather rock is wet, so it could be raining.
Really ā¦
Letās hope itās that simple.
Iām getting the same error, just submitted my ticket.
In my experience dialectic grease shouldnāt be used in the connections.
Dielectric grease is a non-conductive insulator. Packing it directly into a low-voltage, multi-pin signal connection is a classic recipe for making an intermittent problem much worse. If the pin tension is already weak (which is exactly whatās happening with the Yarbo M25 harness), the grease can easily lodge between the contacts, block the physical metal-on-metal connection, and completely insulate the pins.
Its real job is exactly what you said: sealing out moisture by being applied to the rubber weather-boots, outer shrouds, or high-tension single contacts (like spark plug wires) where the physical clamping force is high enough to bite right through it.
What to use instead
If you want to treat the actual pins on a multi-pin harness, you have two real options:
Electronic Contact Cleaner (e.g., CRC QD): This is a fast-evaporating solvent designed to clear out dirt, corrosion, or manufacturing oils without leaving any residue behind.
Contact Enhancers (e.g., DeoxIT D5): Unlike dielectric grease, this is designed to be applied to the contacts themselves. It deoxidizes the metal and leaves a microscopic, conductive film that actually improves signal transfer rather than insulating it.
For this specific Yarbo issue, your best bet is to keep those pins completely clean, dry, and free of any grease. Focus entirely on the physical connectionāensuring the pins arenāt recessed and that the locking collar is pulling the tightest possible mechanical fit until support can ship out those conductive tension springs.
Welp, my issue came back āwaiting for Blades to reach speedā. Rover at 18% battery. I hit record in logs. Looked under mower no blades moving. Tried manually they both spin. Hit resume it cut 5 feet and then the error came back again. Looked under mower and left blade spinning, right blade was not. Tried to resume plan, same error. I then tried again after cleaning deck, but by that time it was at 15% and went to recharge.
@Yarbo-Forum This ticket has been open since May 17th. Last update was 14 days ago when it got moved up to the ātechnical teamā. No updates since then.
Sorry for the delayed response. I understand how frustrating this must be, especially after spending so much time troubleshooting and waiting for updates.
Iāve asked the team to review your case as soon as possible and will follow up internally on the status of your escalation.
Sorry for the inconvenience caused. Iāve also asked our team to review your case as soon as possible and follow up on the status of your ticket.
Thatās an interesting thought. Maybe as the connector warms up it has a higher chance of breaking that connection?
I did try the dielectric grease, but still had the same issues. Mows fine all night long, but when the sun is out and itās warm out, it will throw the blade not spinning error every few minutes after the first hour of mowing.
I did spray the connector down with CRC QD to retry it today, but i also may try the suggestion by rcguymike to use a contact enhancer (DeoxIT D5).
I wish support was just faster, been waiting 2 weeks. Why cant they just send the springs right away if they think thatās the problem. Has anyone had success with the springs?
They worked on the snow blower but Iāve only seen one for the mower and no joy there. Probably a different issue though.
Just wish they would do something and figure this out. The pro mower was not a cheap module and to have issues so early in itās product life does not make me feel good about itās long term performance.
I think they know, just not sharing yet. Seems like a replacement Pro mower is the most common fix.
Maybe in Pro mower 2.0 they can get the ultrasonic sensors to perform like they are supposed to. Canāt use moderate bypass as the damn thing will see a dandelion, canāt use ultrasonics as it will stop for everything that is even remotely close, and then there is the issue of seeing vehicles that donāt exist, and then there is the issue where I turned all that crap off and it still saw an object. Buggy buggy yarbo.
I had an email from the FSE team this morning on my Pro mower module issues (see linked topic).
FSE email "ā¦ I understand that the spring adjustment did not resolve the issue, which indicates that the problem lies with the mower module itself. I have submitted a request for a brand-new replacement mower module on your behalf.
Your replacement mower module is expected to ship within 7-10 business days. Once it is dispatched, you will receive a tracking number via email. Please ensure your shipping address is up to date. I am closely monitoring this process and will keep you informed of any updates. "
email thread - 2024 Core Issues
IMHO the power harness is either to short or the routing is causing a bind, thus causing a poor or broken connection.
I agree with you. Something is going on with the Pros, either parts supplier issue or an error in assembly. I havenāt heard anything official on what the actual failure is. It leaves us guessing what steps to follow to diagnose it.
Hi there, sorry for the delayed response. As discussed in your support ticket, once the firmware rollout is complete and the diagnostic services are fully available again, we will resume our investigation and review your unit in detail.
Thank you for your patience while we work toward a final conclusion.
No update, no response to ticket, this issue has been going on for almost a month now. @Yarbo-Forum
@Yarbo-Forum on Sunday I recorded data and placed additional information in my already open ticket from 26 days ago. Why is support not looking into this as I saved the data with me trying to run plan automatically and manually, when the issue is present?
It just did it again June 9th 2026 2:10PM. Was out mowing got to 18% and found it sitting there with error waiting for blades to reach speed. I started recording data at that point. Walked out there found only left blade spinning. Paused plan, tried again, same result. Tried manually, same result, left blade only. Sent it to be charged, stopped data recording and added this to my ticket. @Yarbo-Forum
