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bms_a050
Moderate
Tesla · Sedans
Battery coolant level low
Quick Answer
Error code BMS_a050 on your Tesla Sedans means: Battery coolant level low. This is usually fixable — see the step-by-step guide below.
Affected Models
Applies to all models
T3T3HT3PTSTSLRTSP
Likely Causes
  1. Coolant leak from thermal management system hose or connector
  2. Coolant pump seal failure causing slow seepage
  3. Damaged coolant reservoir allowing evaporation or spillage
  4. Normal coolant level drop from extended vehicle use
  5. Coolant line separation from junction or connection point
How to Fix It
1
Locate battery thermal management coolant reservoir under vehicle
2
Visually inspect all coolant hoses and connections for leaks
3
Check coolant level indicator in reservoir
4
Top off coolant with manufacturer-approved thermal fluid if safe level not reached
5
Monitor coolant level for rapid drops indicating active leak requiring service
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
Battery thermal management coolant fluid
Coolant hose replacement kit
Hose clamps and connectors
Coolant reservoir sealant
Related Error Codes
DI_a180DI_a190BMS_a066BMS_a064CP_a043
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