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.
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HOMESERVICE MANUALSTOYOTA2018PRIUS TWO ECOREPAIR AND DIAGNOSIS (SINGLE PAGE)QUICK LOOKUPSDTC INDEXTHEFT DETERRENT / KEYLESS ENTRY DTCSIMMOBILIZER SYSTEM
2018 Toyota Prius Two Eco
Immobilizer System
2018 Toyota Prius Two EcoSECTION Immobilizer System
IMMOBILIZER SYSTEM DIAGNOSTIC TROUBLE CODE (DTC) IDENTIFICATION
| DTC Code | Description |
|---|---|
| B2779 | Engine Starter Communication Malfunction |
| B2784 | Antenna Coil Open / Short |
| B278A | Short to GND in Immobiliser System Power Source Circuit |
| B2790 | ID BOX EEPROM Malfunction |
| B2799-86 | Engine Immobiliser System Signal (Some Circuit Quantity, Reported via Serial Data) Invalid |
| B279A-12 | Engine Immobiliser System Circuit Short to Battery |
| B279C-95 | Engine Immobiliser System Incorrect Assembly |
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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.