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.
2021 Toyota Prius LE AWD-eFACTORY 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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