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)BODY & FRAMEDOOR LOCKSSMART KEY SYSTEM (KEYLESS START) - DIAGNOSTIC CODES & SYMPTOM TESTS
2018 Toyota Prius Two Eco
Smart Key System (Keyless Start) - Diagnostic Codes & Symptom Tests
2018 Toyota Prius Two EcoSECTION Smart Key System (Keyless Start) - Diagnostic Codes & Symptom Tests
- SMART KEY SYSTEM (for Start Function)
- DTC B2271: Ignition Hold Monitor Malfunction [11/2015 - ]
- DTC B2274: ACC Monitor Malfunction [11/2015 - ]
- DTC B2275: STSW Monitor Malfunction [11/2015 - ]
- DTC B2277: Detecting Vehicle Submersion [11/2015 - ]
- DTC B2278: Engine/Power Switch Malfunction [11/2015 - ]
- DTC B2282: Vehicle Speed Signal Malfunction [11/2015 - ]
- DTC B2284: Brake Signal Malfunction [11/2015 - ]
- DTC B228B: System Voltage or GND Energization Malfunction [11/2015 - ]
- DTC U0103: Lost Communication with Gear Shift Module "A"; DTC U0129: Lost Communication with Skid Control ECU; DTC U0140: Lost Communication with Main Body ECU; DTC U0142: Lost Communication with Main Body ECU; DTC U0293: Lost Communication with Hybrid Vehicle Control System; DTC U1117: Lost Communication with Accessory Gateway [11/2015 - 07/2020]
- DTC U0103: Lost Communication with Gear Shift Module "A"; DTC U0129: Lost Communication with Skid Control ECU; DTC U0140: Lost Communication with Main Body ECU; DTC U0142: Lost Communication with Main Body ECU; DTC U0293: Lost Communication with Hybrid Vehicle Control System [07/2020 - ]
- Symptom Tests
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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.