bms_a046
Moderate
Tesla · Sedans
Battery preconditioning unavailable
Quick Answer
Error code BMS_a046 on your Tesla Sedans means: Battery preconditioning unavailable. This is usually fixable — see the step-by-step guide below.
Affected Models
Likely Causes
How to Fix It
1
Precondition via touchscreen climate settings while plugged in to charger
2
Check coolant level in battery thermal management system
3
Verify battery heater function is occurring by monitoring battery temperature rise
4
If temperature doesn't increase, suspect heater element failure
5
Contact Tesla service for coolant pump or heater element replacement
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 coolant replacement fluid
Coolant circulation pump
HV battery heater element
Thermal management valve
Related Error Codes