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 Plug-inFACTORY OEM SERVICE PROCEDURE
Push-Button Start
PUSH-BUTTON START DIAGNOSTIC TROUBLE CODE (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 |
| B27A5 | Open in Front Floor Electrical Key Oscillator Circuit |
| B27A6 | Open in Rear Floor Electrical Key Oscillator Circuit |
| B27A7 | Open in Inside Luggage Compartment Electrical Key Oscillator Circuit |
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.
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