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 TwoFACTORY OEM SERVICE PROCEDURE
Diagnostic Trouble Code Chart
WARNING: This page is about a different variant/trim than selected.
CRUISE CONTROL SYSTEM
| DTC Code | Detection Item | See |
|---|---|---|
| P0571 | Brake Switch "A" Circuit | Refer to DTC P0571: Brake Switch "A" Circuit |
| P0575 | Cruise Control Input Circuit | Refer to DTC P0575: Cruise Control Input Circuit |
| P1578 | Brake System Malfunction | Refer to DTC P1578: Brake System Malfunction |
| U0122 | Lost Communication with Vehicle Dynamics Control Module | Refer to DTC U0122: Lost Communication with Vehicle Dynamics Control Module |
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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