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di_a138
Moderate
Tesla · Sedans
Regenerative braking limited
Quick Answer
Error code DI_a138 on your Tesla Sedans means: Regenerative braking limited. This is usually fixable — see the step-by-step guide below.
Affected Models
Applies to all models
T3T3HT3PTSTSLRTSP
Likely Causes
  1. Battery state of charge near maximum limiting regen acceptance
  2. Drive inverter thermal limit reducing available regen current
  3. Motor winding temperature too high for safe regenerative operation
  4. HV battery internal resistance too high to safely accept regen energy
  5. Brake fluid level low activating hydraulic backup mode
How to Fix It
1
Allow battery and motor to cool for 20 minutes in shade
2
Check HV battery state of charge - reduce to below 95% for full regen
3
Verify brake fluid level via service menu
4
Monitor motor and inverter temperatures during test drive
5
If limitation persists at moderate temperatures, contact service for inverter or battery evaluation
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
Brake fluid replacement kit
Thermal paste for motor connections
Diagnostic thermal imaging tool
Related Error Codes
DI_a180DI_a190BMS_a066BMS_a064CP_a043
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