bms_a066
Moderate
Tesla · SUVs
High voltage isolation fault
Quick Answer
Error code BMS_a066 on your Tesla SUVs means: High voltage isolation fault. This is usually fixable — see the step-by-step guide below.
Affected Models
Likely Causes
How to Fix It
1
Disable high voltage system immediately
2
Inspect battery pack for water damage or cracks
3
Check all high voltage connector seals
4
Perform megohm test on battery insulation
5
Replace damaged battery pack or isolation relay
Pro Tip
This fix requires some technical knowledge. If you're unsure about any step, consider contacting support or a qualified technician.
Parts You May Need
High voltage battery pack
Isolation relay
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