Table 1 shows one common other fuel system related problems of the 2019 Tesla Model X.
| Problem Category | Number of Problems |
|---|---|
| Other Fuel System problems |
After charging, the car threw over 16 error codes and would not drive. Tesla advised the car experienced a high voltage battery failure. Some the error codes experienced were: gtw_w370 battery charge level too low charge now - vehicle may not wake from sleep bms_w017 service is required pull over safely di_u014 unable to drive voltage supply too low morganville gtw_w157 power reduced vehicle systems shutting down bms_f017 service is required pull over safely tas_a218 air suspension adjustment unavailable functionality may be restored on next drive bms_u018 maximum battery charge level reduced ok to drive - schedule service bms_u008 acceleration and top speed reduced performance may be restored on next drive bms_w107 vehicle may not restart service is required bms_f107.
While driving normally at around 30mph and without warning, the vehicle displayed multiple warning messages related to the hv battery and lost all motive power in the middle of the road with insufficient time to pull over, creating a safety hazard. Upon inspection by a mechanic independent of Tesla, the hv battery was found to have multiple voltage sense leads disconnected from the flexible pcb pads that lead to the bmb for each module. One of the 96 bricks had all four sense leads disconnected, resulting in the loss of motive power due to the inability for the bms to accurately measure the voltage of that brick. In fact, the vehicle displayed module over voltage and under voltage alerts due to this open/high resistance sense harness connection. Out of all 96 bricks, 13 bricks had at least one loose sense lead, and one brick (besides the affected brick) had 3 out of 4 sense leads loose/disconnected from the pcb pad. Any loose leads were only at the pcb pad end, not at the current collector end. These sense leads are ultrasonically welded through the same attachment process as the cells, but the connections to the flex pcb pad are clearly not as robust as the other connections or are exposed to higher vibration over time due to relative motion of the flex. The flex pcb design was introduced in 2015, just before the gen 2 hv battery, and in production until the 2021 refresh. The hv battery did not ever have any visible liquid ingress or physical damage. It is my understanding through various forums such as Tesla motors club that this is an increasingly common issue, and that Tesla is experiencing a high rate of this open voltage sense harness issue at their service centers for vehicles that have not been in any prior accidents or incidents (forums generally only have salvage vehicles that are out of warranty). Errors typically are: bms_f107_sw_cell_voltage_sensor bms_f177_openvshdetected bms_w129_sw_bmb_vsh_connector or their variants (a129, w177, etc. ).
On Jan 1st, approx 6 pm (completely dark), I was driving my 2019 mx (41k miles) traveling at 60-65mph on i5. All of a sudden, I noticed a series of dashboard warnings popped up with warning sounds -> "acceleration/top speed reduced", "performance reduced", "service require", and "vehicle system shutting down". I had to pull over to the left shoulder due to limited control of my mx and I was only able to coast without any control of my power padel. . It was a scary moment hearing the beeping warning sound and the cars flying by in the express lane. Feeling the mx shaken every time when car passes by. I tried to call Tesla roadside assistance and waited for >40 min without anyone picking up the call. Decided to call the highway patrol and we were extremely lucky when the patrol car pulled up to protect us with its flashing warning lights. Because within five minutes of highway patrol arrival, all power shut down!! my warning light blinker and headlights were out completely!!! we could have been in a detrimental situation if the patrol car did not show up and ended up with cars/semi running into our parked mx. After the tow truck (summoned by the officer) towed our mx to the nearest SC (4. 5 miles away), we paid the outrageous $930 fee. After the Tesla rep informed me the hv battery and the 12v needs to be replaced.