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Jul 5, 2019
Northern Ireland
Anyone able to help with performing diagnostics on SP90D?
Local SC are no help as it's a salvage car.

Have OBD2 adapter cable connected and using TM-spy on IOS but need proper diagnostics carried out to find problem.

Car will not drive/charge
Error messages:
Car needs service - Unable to start car
Power reduced - Vehicles systems shutting down
Unable to drive - Voltage supply too low

12v drains as nothing coming from DC converter, front or rear HVJB. Opened rear HVJB and checked fuses, all ok.
Pyro-fuse ok.
HV battery still holding charge at 107 miles and has held this for over a month.

I haven’t removed battery. I think contractors within battery are ok. Is there anything else in battery to check?


New Member
Jan 14, 2020
I have a recently repaired cat d model s, airbag light is on and module has been repaired, any idea where or how I can get a diagnostic check to pin point the fault ?

Sorry can’t shed any light in your issue.... hope it doesn’t happen to my one


Jan 24, 2021
Portland, Oregon
Have you checked the fuses in the dc converter? Depending on what year yours is, they are either in the junction block or the dc converter. There are two and they are known to blow. Not too difficult to do the job, but awkward. Fuses are $60 from tesla or $9 on amazon.

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