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Diagnostic Trouble Code Chart

WARNING: This page is about a different car, the 2010 Lexus GS 450h. However, it is still accessible from the selected car via links, so may be relevant.

HINT: 

If a trouble code is displayed during the DTC check, check the trouble area listed for that code in the table below. Then proceed to the "See" below.

POWER STEERING SYSTEM

DTC Code Detection Item Trouble Area See
C1511 Torque Sensor Circuit Malfunction 1. Wire harness or connector
2. Torque sensor (built into power steering link assembly)
3. Power steering ECU assembly		 Refer to DTC C1511: Torque Sensor Circuit Malfunction; DTC C1512: Torque Sensor Circuit Malfunction; DTC C1513: Torque Sensor Circuit Malfunction
C1512 Torque Sensor Circuit Malfunction 1. Wire harness or connector
2. Torque sensor (built into power steering link assembly)
3. Power steering ECU assembly		 Refer to DTC C1511: Torque Sensor Circuit Malfunction; DTC C1512: Torque Sensor Circuit Malfunction; DTC C1513: Torque Sensor Circuit Malfunction
C1513 Torque Sensor Circuit Malfunction 1. Wire harness or connector
2. Torque sensor (built into power steering link assembly)
3. Power steering ECU assembly		 Refer to DTC C1511: Torque Sensor Circuit Malfunction; DTC C1512: Torque Sensor Circuit Malfunction; DTC C1513: Torque Sensor Circuit Malfunction
C1515 Torque Sensor Zero Point Adjustment Undone - Refer to DTC C1515: Torque Sensor Zero Point Adjustment Undone; DTC C1525: Rotation Angle Sensor Initialization Undone
C1516 Torque Sensor Zero Point Adjustment Incomplete - Refer to DTC C1516: Torque Sensor Zero Point Adjustment Incomplete; DTC C1526: Rotation Angle Sensor Initialization Incomplete
C1521 Motor Circuit Malfunction 1. Wire harness or connector
2. Power steering motor (built into power steering link assembly)
3. Power steering ECU assembly		 Refer to DTC C1521: Motor Circuit Malfunction; DTC C1522: Motor Circuit Malfunction; DTC C1523: Motor Circuit Malfunction; DTC C1524: Motor Circuit Malfunction; DTC C1532: ECU Malfunction; DTC C1555: Motor Relay Welding Failure
C1522 Motor Circuit Malfunction 1. Wire harness or connector
2. Power steering motor (built into power steering link assembly)
3. Power steering ECU assembly		 Refer to DTC C1521: Motor Circuit Malfunction; DTC C1522: Motor Circuit Malfunction; DTC C1523: Motor Circuit Malfunction; DTC C1524: Motor Circuit Malfunction; DTC C1532: ECU Malfunction; DTC C1555: Motor Relay Welding Failure
C1523 Motor Circuit Malfunction 1. Wire harness or connector
2. Power steering motor (built into power steering link assembly)
3. Power steering ECU assembly		 Refer to DTC C1521: Motor Circuit Malfunction; DTC C1522: Motor Circuit Malfunction; DTC C1523: Motor Circuit Malfunction; DTC C1524: Motor Circuit Malfunction; DTC C1532: ECU Malfunction; DTC C1555: Motor Relay Welding Failure
C1524 Motor Circuit Malfunction 1. Wire harness or connector
2. Power steering motor (built into power steering link assembly)
3. Power steering ECU assembly		 Refer to DTC C1521: Motor Circuit Malfunction; DTC C1522: Motor Circuit Malfunction; DTC C1523: Motor Circuit Malfunction; DTC C1524: Motor Circuit Malfunction; DTC C1532: ECU Malfunction; DTC C1555: Motor Relay Welding Failure
C1525 Rotation Angle Sensor Initialization Undone - Refer to DTC C1515: Torque Sensor Zero Point Adjustment Undone; DTC C1525: Rotation Angle Sensor Initialization Undone
C1526 Rotation Angle Sensor Initialization Incomplete - Refer to DTC C1516: Torque Sensor Zero Point Adjustment Incomplete; DTC C1526: Rotation Angle Sensor Initialization Incomplete
C1528 Motor Rotation Angle Sensor Malfunction 1. Motor rotation angle sensor (built into power steering link assembly
2. Wire harness or connector
3. Power steering earth wire
4. Power steering ECU assembly		 Refer to DTC C1528: Motor Rotation Angle Sensor Malfunction
C1531 ECU Malfunction 1. Power steering ECU assembly Refer to DTC C1531: ECU Malfunction; DTC C1533: ECU Malfunction; DTC C1534: ECU Malfunction
C1532 ECU Malfunction 1. Wire harness or connector
2. Power steering motor (built into power steering link assembly)
3. Power steering ECU assembly		 Refer to DTC C1521: Motor Circuit Malfunction; DTC C1522: Motor Circuit Malfunction; DTC C1523: Motor Circuit Malfunction; DTC C1524: Motor Circuit Malfunction; DTC C1532: ECU Malfunction; DTC C1555: Motor Relay Welding Failure
C1533 ECU Malfunction 1. Power steering ECU assembly Refer to DTC C1531: ECU Malfunction; DTC C1533: ECU Malfunction; DTC C1534: ECU Malfunction
C1534 ECU Malfunction 1. Power steering ECU assembly Refer to DTC C1531: ECU Malfunction; DTC C1533: ECU Malfunction; DTC C1534: ECU Malfunction
C1541 Vehicle Speed Signal Malfunction 1. Speed sensor circuit
2. Skid control ECU
3. CAN communication system
4. Power steering ECU assembly		 Refer to DTC C1541: Vehicle Speed Signal Malfunction
C1551 IG Power Supply Voltage Malfunction 1. Power steering ECU assembly Refer to DTC C1551: IG Power Supply Voltage Malfunction
C1552 PIG Power Supply Voltage Malfunction 1. EPS relay
2. ECU-B fuse
3. EPS fuse
4. Wire harness or connector
5. Power steering ECU assembly		 Refer to DTC C1552: PIG Power Supply Voltage Malfunction; DTC C1554: Power Supply Relay Failure
C1554 Power Supply Relay Failure 1. EPS relay
2. ECU-B fuse
3. EPS fuse
4. Wire harness or connector
5. Power steering ECU assembly		 Refer to DTC C1552: PIG Power Supply Voltage Malfunction; DTC C1554: Power Supply Relay Failure
C1555 Motor Relay Welding Failure 1. Wire harness or connector
2. Power steering motor (built into power steering link assembly)
3. Power steering ECU assembly		 Refer to DTC C1521: Motor Circuit Malfunction; DTC C1522: Motor Circuit Malfunction; DTC C1523: Motor Circuit Malfunction; DTC C1524: Motor Circuit Malfunction; DTC C1532: ECU Malfunction; DTC C1555: Motor Relay Welding Failure
C1567 Lost Communication between EPS ECU and VGRS ECU 1. Steering control ECU
2. Local CAN communication		 Refer to DTC C1567: Lost Communication between EPS ECU and VGRS ECU
C1581 Assist Map Number Un-Writing 1. Power steering ECU assembly Refer to DTC C1581: Assist Map Number Un-Writing
U0073 Control Module Communication Bus OFF 1. CAN communication system Refer to DTC U0073: Control Module Communication Bus OFF; DTC U0104: Lost Communication with Driving Support ECU; DTC U0129: Lost Communication with Skid Control ECU; DTC U0130: Lost Communication with VGRS; DTC U0293: Lost Communication with HV ECU
U0104 Lost Communication with Driving Support ECU 1. Distance control ECU
2. CAN communication system		 Refer to DTC U0073: Control Module Communication Bus OFF; DTC U0104: Lost Communication with Driving Support ECU; DTC U0129: Lost Communication with Skid Control ECU; DTC U0130: Lost Communication with VGRS; DTC U0293: Lost Communication with HV ECU
U0129 Lost Communication with Skid Control ECU 1. Skid control ECU
2. CAN communication system		 Refer to DTC U0073: Control Module Communication Bus OFF; DTC U0104: Lost Communication with Driving Support ECU; DTC U0129: Lost Communication with Skid Control ECU; DTC U0130: Lost Communication with VGRS; DTC U0293: Lost Communication with HV ECU
U0130 Lost Communication with VGRS 1. Steering control ECU
2. CAN communication system		 Refer to DTC U0073: Control Module Communication Bus OFF; DTC U0104: Lost Communication with Driving Support ECU; DTC U0129: Lost Communication with Skid Control ECU; DTC U0130: Lost Communication with VGRS; DTC U0293: Lost Communication with HV ECU
U0293 Lost Communication with HV ECU 1. HV ECU
2. CAN communication system		 Refer to DTC U0073: Control Module Communication Bus OFF; DTC U0104: Lost Communication with Driving Support ECU; DTC U0129: Lost Communication with Skid Control ECU; DTC U0130: Lost Communication with VGRS; DTC U0293: Lost Communication with HV ECU
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