Tesla Fault Codes
Tesla doesn't use OBD-II for primary diagnostics. Codes show up as alpha-numeric identifiers like AP_w058 (Autopilot warning), BMS_a067 (battery management alert), or DI_a113 (drive inverter) on the touchscreen service menu and via aftermarket apps like Scan My Tesla and TM-Spy. This hub breaks down what each code means in plain language, why it triggers, what's likely causing it, and whether you can keep driving. We cover every Tesla model: S, 3, X, Y, and Cybertruck.
Most Common Tesla Fault Codes
Showing 30 of 101 Tesla codes, sorted by severity. Each links to causes, diagnostics, and common fixes.
Tesla Subsystem Code Prefixes
| Prefix | Subsystem | What it covers |
|---|---|---|
| AP_ | Autopilot / Autosteer / FSD | Camera obstruction, calibration, neural net warnings, AutoSteer disengagement. |
| BMS_ | Battery Management | 12V auxiliary battery, high-voltage pack health, charge limit reductions. |
| DI_ | Drive Inverter / Motor | Motor temperature, power reductions, front/rear drive unit faults. |
| VCFRONT_ | Vehicle Controller -- Front | Front body controller. 12V system, sensors, lighting. |
| VCRIGHT_ / VCLEFT_ | Vehicle Controller -- Doors | Door modules, windows, mirrors, side cameras. |
| UI_ | Touchscreen / Infotainment | MCU faults, app connectivity, screen reboots. |
| CHARGE_ | Charging System | Charge port, on-board charger, Supercharger session faults. |
| HVP_ | High Voltage Pack | Contactor state, isolation faults, pack thermal events. |
Common Tesla Issues
- AP_w058 Camera Blocked -- ice, sun glare, condensation, dirty windshield
- BMS_a079 12V Battery -- end-of-life replacement, common at 3-4 years
- DI_a113 Drive Inverter Hot -- repeated launches, sustained track use, hot weather
- VCFRONT_a191 12V Voltage Low -- usually paired with BMS_a079 battery replacement
- UI_a004 Touchscreen Reboot -- MCU2/MCU3 hangs, soft reset via dual scroll wheel hold
- CHARGE_a160 Charging Stopped -- defective charger, on-board charger fault, harness
- AP_w090 Calibration Required -- after windshield replacement or camera bumps
How to Read Tesla Codes
Touchscreen Service Menu
Long-press the Tesla "T" logo on the touchscreen, then tap the version number. Service menu shows active and historical codes. No tools needed, but limited detail.
Scan My Tesla App
$5 one-time app purchase + a Tesla-specific OBD-II adapter (OBDLink MX+ or Veepeak ~$50-100). Shows real-time CAN data, battery cell voltages, motor temps, charge stats. Industry standard for owner diagnostics.
TM-Spy
Alternative to Scan My Tesla for Android. More polished UI, similar capability. Same OBD-II adapter requirement.