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.
Can Communication System (Except Plug-In) (Diagnostic Codes & Symptom Tests)
2012 Toyota Prius ThreeSECTION Can Communication System (Except Plug-In) (Diagnostic Codes & Symptom Tests)
- Can Communication System
- DTC U0100: Lost Communication with ECM / PCM
- DTC U0104: Lost Communication with Driving Support ECU
- DTC U0129: Lost Communication with Brake System Control Module
- DTC U0164: Lost Communication with A/C ECU
- DTC U1002: Lost Communication with Gateway Module (Parking Assist Bus)
- DTC U1002: Lost Communication with Gateway Module (Power Management 1)
- DTC U1002: Lost Communication with Gateway Module (Power Management 2)
- DTC U1100: Lost Communication with Seat Belt Control ECU
- Symptom Tests
- Skid Control ECU Communication Stop Mode
- Power Steering ECU Communication Stop Mode
- Steering Angle Sensor Communication Stop Mode
- Yaw Rate Sensor Communication Stop Mode
- ECM Communication Stop Mode
- Transmission Control ECU Communication Stop Mode
- Main Body ECU Communication Stop Mode
- Power Management Control ECU Communication Stop Mode
- Combination Meter ECU Communication Stop Mode
- Certification ECU Communication Stop Mode
- Center Airbag Sensor Communication Stop Mode
- Navigation ECU Communication Stop Mode
- Audio Receiver Assembly Communication Stop Mode
- Circuit 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.