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
Lin Communication System
MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) DTC IDENTIFICATION
| DTC Code | Description |
|---|---|
| B1206 | P/W Master Switch Communication Stop |
| B2321 | Driver Side Door ECU Communication Stop |
| B2322 | Front Passenger Side Door ECU Communication Stop |
| B2323 | Rear Door RH ECU Communication Stop |
| B2324 | Rear Door LH ECU Communication Stop |
| B2325 | LIN Communication Bus Malfunction |
CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) DTC IDENTIFICATION
| DTC Code | Description |
|---|---|
| B2785 | Communication Malfunction between ECUs Connected by LIN |
| B2786* | No Response from Steering Lock ECU |
| B2789 | No Response from ID BOX |
| B278C | Lost Communication with Power Source Control |
POWER MANAGEMENT CONTROL ECU DTC IDENTIFICATION
| DTC Code | Description |
|---|---|
| B2287 | LIN Communication Master Malfunction |
Factory Service Tools
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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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