Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
2012 Toyota Prius TwoFACTORY OEM SERVICE PROCEDURE
SMART KEY SYSTEM (for Start Function)
SMART KEY SYSTEM (FOR START FUNCTION) DTC IDENTIFICATION
| DTC Code | Description |
|---|---|
| B2271 | Ignition Hold Monitor Malfunction |
| B2274 | ACC Monitor Malfunction |
| B2275 | STSW Monitor Malfunction |
| B2277 | Detecting Vehicle Submersion |
| B2282 | Vehicle Speed Signal Malfunction |
| B2284 | Brake Signal Malfunction |
| B2286 | Runnable Signal Malfunction |
| U0293 | Lost Communication with HV ECU |
Factory Service Tools
Use the Manual With the Right Hardware
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.