bms_a046
Moderate
Tesla · SUVs
Battery preconditioning unavailable
Quick Answer
Error code BMS_a046 on your Tesla SUVs means: Battery preconditioning unavailable. This is usually fixable — see the step-by-step guide below.
Affected Models
Likely Causes
How to Fix It
1
Allow vehicle to remain plugged in for 30 minutes
2
Check coolant level in thermal management system
3
Verify coolant pump operation by listening for noise
4
Inspect coolant hoses for blockage or leaks
5
Restart BMS software via vehicle diagnostics menu
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
Coolant pump
Thermal management module
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