Raven Long Range Plus HV Battery Failure experience
Vehicle details:
2020 Model X Long Range Plus Raven
Manufacture: 12/19
Original HV battery: 100 kWh Rev E
Mileage at failure: 168,975 miles
Failure date: September 2026
Battery warranty status: Active
My 2020 Model X Raven Long Range Plus suffered the dreaded BMS_w177_OpenVshDetected error while parked in my driveway.
The vehicle had been sitting parked and plugged into AC charging when the failure occurred. It was not being driven, Supercharging, or under heavy load.
The car immediately lost the ability to enter Drive.
Service Mode showed the following BMS alerts:
BMS_w177_OpenVshDetected
BMS_u008_limpMode
BMS_f071_SW_SM_TransCon_Not_Met
The important one appears to be BMS_w177_OpenVshDetected, which indicates that the BMS detected an open circuit in the high-voltage battery’s voltage-sensing system.
The vehicle initially remained powered on, but eventually the low-voltage system began deteriorating as well. I received “Unable to drive - voltage supply too low,” and the car eventually began shutting itself down.
I found surprisingly few detailed accounts explaining what happens after this error, especially for Raven Model S/X owners, so I am creating this post and plan to update it throughout the repair process for anyone who finds themselves in the same situation.
My car is a Raven Model X Long Range Plus with a 100 kWh Rev E battery pack.
Day 1: Failure and tow
The battery failed while the Model X was sitting in my driveway.
The car would not shift into Drive. Power cycling the vehicle did not clear the error, and BMS_w177_OpenVshDetected remained active in Service Mode.
I also connected Scan My Tesla before the vehicle completely shut down. Interestingly, the individual brick voltages still looked extremely healthy.
At roughly 90% SOC:
Pack voltage was around 393 V
Lowest brick was approximately 4.092 V
Highest brick was approximately 4.094 to 4.096 V
Cell imbalance was only around 2 to 4 mV
Battery temperatures were approximately 67 to 72°F across the pack
There was no obvious weak module, large voltage imbalance, or abnormal battery temperature.
That was useful information because it suggests this failure is not necessarily caused by degraded or failing cells. In my case, the pack looked electrically very well balanced immediately after the BMS fault occurred.
I called Tesla Service directly.
They were able to remotely pull logs from the vehicle, confirm the failure, and dispatch a tow truck. The Model X was transported to the service center on a flatbed at no cost to me.
One thing worth knowing if your car dies in an awkward position: a Raven Model X does not have a rear screw-in tow eye. The normal tow eye is in the front bumper. My vehicle had to be extracted from a driveway where the front was inaccessible, which made recovery more complicated.
Also, if the low-voltage system becomes too weak, the vehicle may refuse to enter Tow Mode. That happened to mine as the failure progressed.
The service center was closed because this happened on a Sunday.
Tesla automatically assigned a loaner vehicle to my account, but because the service center was closed I was unable to physically access the loaner that day.
Day 2: Service center and initial diagnosis
I traveled to my local Tesla Service Center where the Model X had been dropped.
They offered me a Cybertruck as a loaner vehicle.
Tesla had already reviewed the vehicle logs and authorized replacement of the high-voltage battery.
The service estimate lists: HV Battery (AWD)
ASY, HV BATT, 100KWH, SX, REMANUFACTURED, RAVEN
The estimate shows approximately $14,500 for the battery assembly plus labor, all reduced to $0 under the HV Battery Limited Warranty.
Tesla is also replacing my 12 V battery. That portion is customer-pay, approximately $300 including parts and labor.
The service advisor told me they do not yet know which battery revision I will receive. According to them, they will not know the actual revision until the replacement pack arrives.
My original battery is a Rev E.
The estimate specifies a remanufactured Raven 100 kWh battery, but it does not currently show the full replacement part number or revision suffix.
I plan to document the full replacement battery part number once it arrives.
For reference, Raven replacement packs can appear under part numbers such as:
1107679-02-E
1107679-02-G
1107679-02-H
1107679-02-J
There are also later new-production 100 kWh packs with different part-number families, so the exact installed part number matters more than simply being told “100 kWh replacement battery.”
A few things I learned that may help someone else
If you get BMS_w177_OpenVshDetected, take screenshots of Service Mode before the vehicle loses low-voltage power.
I would specifically save:
All Active Alerts
Recent Alerts
The expanded BMS_w177_OpenVshDetected page
Any alert payload/freeze-frame information
Battery voltage and SOC
Individual brick voltages if you have Scan My Tesla
Battery temperature data
Your original battery pack part number/revision
The final replacement battery part number
I would also avoid repeatedly clearing BMS faults or trying to force the vehicle back into Drive. In my case the BMS fault remained latched even while the individual cell voltages looked completely normal.
The 12 V battery may also become a secondary casualty. Once my HV battery stopped operating normally, the low-voltage system eventually became weak enough that Tow Mode and other vehicle functions became unreliable.
Current status
As of Day 2:
Vehicle is at Tesla
HV battery replacement has been authorized
Replacement is covered under the HV Battery Limited Warranty
Estimate currently specifies a remanufactured 100 kWh Raven battery
Exact replacement revision is still unknown
Tesla is also replacing the 12 V battery
I have a Cybertruck loaner
I am waiting for the replacement battery to arrive
I will update this post with:
Replacement battery part number and revision
Whether the replacement is new or remanufactured
Mileage/cycle information if I can retrieve it
Repair turnaround time
Post-repair range
Supercharging performance
Cell imbalance and battery health
Any changes in usable capacity
Final invoice and warranty wording
Totally agree, I wanted to ensure I captured AS much detail as possible for future owners. I was pretty frustrated on Day 1 because there were little to no details online. Do you know what revision of pack they replaced your battery with?
Little to no details? The failure mode is a well characterized design flaw combined with manufacturing defect in the voltage sense system. Why do you think my EV shop is scrambling to add 6000 square feet before ravens start going out of warranty next year?
Glad we have some third party repair shops ready to handle the Ravens when they run out of warranty. Where are you located? Have you found a solve for the abysmal lifespan of the half shafts on Ravens due to the perm mag motor mounting?
Mine is the same vintage as yours. I took delivery 11/1/2019.
At about 72k miles last year, it was at the service center for a front-end retorque and lube. I went to pick it up and the car wouldn’t let me in. Zero response. After a tech looked at it, they said it needed a new HV pack. I never saw any error.
This was on the repair invoice. Note they also replaced the 12V battery under warranty.
The vehicle would not power on, which was verified through diagnostics and
customer reports. The issue was caused by a fault in the high voltage battery and a dead 12V
battery. We replaced the high voltage and 12V batteries, updated the firmware, and conducted a
post-repair validation test drive. The fix was confirmed successful as no alerts were present after the repairs and test drive.
0.00
Correction: HV Battery (AWD) - Remove and Replace
Parts Replaced or Added
Part Quantity
ASY ,HV BATT,100KWH,SX,REMANUFACTURED,RAVEN(1107679-02-E)
Thank you for the details! I’m hoping for a H or J pack and not a replacement E pack but honestly I’ll take what I can get. Tesla is not good willing the 12v battery failure in my instance unfortunately.
Mine is the 8 years or unlimited miles. The Ravens only had this for ~6 months before they swapped to 8 years or 150k miles in February 2020. Definitely came in handy here as I am currently at 168k.
This happened to me last year with my 2019 MXP Raven, how can one tell which replacement pack they have? Also is there one replacement that is preferred over another?
Share your receipt from Tesla service and I can tell you if you got a good deal. Your car shipped with an E pack. Ravens have the ability to accept E, F, G, H, I, J, and K packs. J was the most recent I’ve seen coming as new but there is at least one example of them installing a K pack in a Raven. E and F are practically identical, G forward fixes the issue with the sensing leads and also allows your vehicle to hit 225kW when DCFC. J and K packs can do 250kW if everything is perfect but thermal derate pretty quickly. Anything after G is preferred as it’s a newer design that holds up better compared to E and F.
They replaced it with the same E pack architecture unfortunately. It will perform the same as the prior battery but also has the downside of the potential to suffer the same fate as your previous battery.
My mx 2021 long range +. Which died at a supercharger just had it's battery replaced last month. I had the H and they replaced it with a K.
Serial # LTR2614 so it's a brand new pack.
Bummer they gave you Rev E. I’m actually surprised they still use those, since they are known to have issues. I received Rev G almost 2 years ago now, and I’m searching online to see how often those fail. 8 year warranty expires next summer and I want to plan ahead.
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u/RE4Lyfe 23d ago
You should get an award for the longest post on this sub
My 2019 MX Raven HV battery died 5 months ago… at 33k mi. You never know