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.
2018 Toyota Prius Two EcoFACTORY OEM SERVICE PROCEDURE
Power Steering System
POWER STEERING SYSTEM DIAGNOSTIC TROUBLE CODE (DTC) IDENTIFICATION [11/2015 - 12/2018]
| DTC Code | Description |
|---|---|
| C1511 | Torque Sensor1 |
| C1512 | Torque Sensor2 |
| C1513 | Torque Sensor Deviation Excessive |
| C1514 | Torque Sensor Power Supply Voltage |
| C1515 | Torque Sensor Zero Point Adjustment Undone |
| C1516 | Torque Sensor Zero Point Adjustment Incomplete |
| C1517 | Torque Hold |
| C1521 | Short in Motor Circuit |
| C1522 | Power Supply Sensor |
| C1523 | Current Deviation Excessive |
| C1528 | Motor Rotation Angle Sensor |
| C1531 | ECU Malfunction |
| C1532 | ECU Malfunction |
| C1533 | Temperature Sensor Circuit is Low or High |
| C1534 | EEPROM |
| C1541 | Vehicle Speed Signal |
| C1551 | IG Power Supply Voltage |
| C1552 | PIG Power Supply Voltage |
| C1554 | Power Supply Relay Failure |
| C1555 | Motor Relay Welding Failure |
| C1567 | Error in Matching of ECUs |
| C1581 | Assist Map Number Un-Writing |
| C1582 | Assist Map Number Mismatch |
| U0129 | Lost Communication with Brake System Control Module |
| U023A | Lost Communication with Front Camera Module |
| U0293 | Lost Communication with Hybrid Control Module |
| U1110 | Lost Communication with Intuitive Parking Assist Module |
POWER STEERING SYSTEM DIAGNOSTIC TROUBLE CODE (DTC) IDENTIFICATION [12/2018 - 07/2020]
| DTC Code | Description |
|---|---|
| C1511 | Torque Sensor1 |
| C1512 | Torque Sensor2 |
| C1513 | Torque Sensor Deviation Excessive |
| C1514 | Torque Sensor Power Supply Voltage |
| C1515 | Torque Sensor Zero Point Adjustment Undone |
| C1516 | Torque Sensor Zero Point Adjustment Incomplete |
| C1517 | Torque Hold |
| C1521 | Short in Motor Circuit |
| C1522 | Power Supply Sensor |
| C1523 | Current Deviation Excessive |
| C1528 | Motor Rotation Angle Sensor |
| C1531 | ECU Malfunction |
| C1532 | ECU Malfunction |
| C1533 | Temperature Sensor Circuit is Low or High |
| C1534 | EEPROM |
| C1541 | Vehicle Speed Signal |
| C1551 | IG Power Supply Voltage |
| C1552 | PIG Power Supply Voltage |
| C1554 | Power Supply Relay Failure |
| C1555 | Motor Relay Welding Failure |
| C1567 | Error in Matching of ECUs |
| C1581 | Assist Map Number Un-Writing |
| C1582 | Assist Map Number Mismatch |
| U0129 | Lost Communication with Brake System Control Module |
| U023A | Lost Communication with Front Camera Module |
| U0293 | Lost Communication with Hybrid Control Module |
| U1110 | Lost Communication with Intuitive Parking Assist Module |
POWER STEERING SYSTEM DIAGNOSTIC TROUBLE CODE (DTC) IDENTIFICATION [07/2020 - ]
| DTC Code | Description |
|---|---|
| C1511 | Torque Sensor1 |
| C1512 | Torque Sensor2 |
| C1513 | Torque Sensor Deviation Excessive |
| C1514 | Torque Sensor Power Supply Voltage |
| C1515 | Torque Sensor Zero Point Adjustment Undone |
| C1516 | Torque Sensor Zero Point Adjustment Incomplete |
| C1517 | Torque Hold |
| C1521 | Short in Motor Circuit |
| C1522 | Power Supply Sensor |
| C1523 | Current Deviation Excessive |
| C1528 | Motor Rotation Angle Sensor |
| C1531 | ECU Malfunction |
| C1532 | ECU Malfunction |
| C1533 | Temperature Sensor Circuit is Low or High |
| C1534 | EEPROM |
| C1541 | Vehicle Speed Signal |
| C1551 | IG Power Supply Voltage |
| C1552 | PIG Power Supply Voltage |
| C1554 | Power Supply Relay Failure |
| C1555 | Motor Relay Welding Failure |
| C1567 | Error in Matching of ECUs |
| C1581 | Assist Map Number Un-Writing |
| C1582 | Assist Map Number Mismatch |
| U0129 | Lost Communication with Brake System Control Module |
| U023A | Lost Communication with Front Camera Module |
| U0293 | Lost Communication with Hybrid Control Module |
| U1110 | Lost Communication with Intuitive Parking Assist 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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