DTC Advanced Diagnostics: EPS related DTCs
EPS Related DTCs
NOTE
Initial Diagnosis:
The initial on-board diagnosis occurs right after the vehicle condition is turned to the ON mode, and the EPS indicator comes on, and continues until the indicator goes off.
Regular Diagnosis:
The regular on-board diagnosis begins right after the EPS indicator goes off, and it continues until the vehicle condition is turned to the OFF (LOCK) mode.
Review "How to troubleshoot the EPS system" before doing the DTC troubleshooting procedure.
Test-drive the vehicle according to local traffic conditions and regulations. Do not test-drive on a lift unless specified.
The possible causes shown may not be a complete list of all potential problems, and it is possible that there may be other causes.
DTC C0051-96: Steering Angle Sensor Malfunction
Confirmation Procedure
Basic Condition:
12 volt battery voltage above 10 V
IG voltage continued more than 10 V more than 5 seconds

Operating Condition:
1.
Turn the vehicle to the ON mode.
Execution
Regular Diagnosis
Duration
About 1 second
DTC Type
1 drive cycle
EPS indicator on
Fail Safe Action
Continue EPS function/assist (Limited assist)
(Continue system diagnosis: EPS function/assist will return to normal when the system returns to normal)
Possible Cause
Steering angle sensor failure

DTC C0063-96: Yaw-Rate Sensor Malfunction
Confirmation Procedure
Basic Condition:
12 volt battery voltage above 10 V
IG voltage continued more than 10 V more than 5 seconds

Operating Condition:
1.
Turn the vehicle to the ON mode.
Execution
Regular Diagnosis
Duration
About 1 second
DTC Type
1 drive cycle
EPS indicator on
Fail Safe Action
Continue EPS function/assist (Limited assist)
(Continue system diagnosis: EPS function/assist will return to normal when the system returns to normal)
Possible Cause
VSA modulator-control unit internal failure (Yaw-rate acceleration sensor)

DTC C1400-13: EPS Motor Circuit Open
Confirmation Procedure
Basic Condition:
12 volt battery voltage above 7.5 V

Operating Condition:
1.
Start the engine.
2.
Turn the steering wheel to left and right several times, and keep holding each direction for 10 seconds.
Execution
Regular Diagnosis
Duration
About 1 second
DTC Type
1 drive cycle
EPS indicator on
Fail Safe Action
Stop EPS function/assist
(Continue system diagnosis: EPS function/assist will return to normal when the system returns to normal)
Possible Cause
Motor/EPS control unit internal failure

DTC C1400-14: Motor Voltage Malfunction
Confirmation Procedure
Operating Condition:
1.
Turn the vehicle to the ON mode and wait more than 6 seconds.
2.
Start the engine and wait more than 1 second.
Execution
Initial Diagnosis
Duration
About 1 second
DTC Type
1 drive cycle
EPS indicator on
Fail Safe Action
Stop EPS function/assist
(Continue system diagnosis: EPS function/assist will return to normal when the system returns to normal)
Possible Cause
Motor/EPS control unit internal failure

DTC C1400-1D: EPS Motor Current Incorrect Correlation
Confirmation Procedure
Basic Condition:
12 volt battery voltage above 7.5 V

Operating Condition:
1.
Start the engine.
2.
Turn the steering wheel to left and right several times, and keep holding each direction for 10 seconds.
Execution
Initial Diagnosis/Regular Diagnosis
Duration
About 1 second
DTC Type
1 drive cycle
EPS indicator on
Fail Safe Action
Stop or does not start EPS function/assist
(Continue system diagnosis: EPS function/assist will return to normal when the system returns to normal)
Possible Cause
Motor/EPS control unit internal failure

DTC C1403-14: Motor Angle Sensor (SIN/COS) Signals Open or Short
Confirmation Procedure
Basic Condition:
12 volt battery voltage 8.0 - 17.5 V

Operating Condition:
1.
Start the engine.
2.
Turn the steering wheel to left and right several times, and keep holding each direction for 10 seconds.
Execution
Initial Diagnosis/Regular Diagnosis
Duration
About 1 second
DTC Type
1 drive cycle
EPS indicator on
Fail Safe Action
Stop or does not start EPS function/assist
(Continue system diagnosis: EPS function/assist will return to normal when the system returns to normal)
Possible Cause
Motor/EPS control unit internal failure

DTC C1403-29: Motor Angle Sensor (SIN/COS) Signals Incorrect Correlation
Confirmation Procedure
Basic Condition:
12 volt battery voltage 8.0 - 17.5 V

Operating Condition:
1.
Start the engine.
2.
Turn the steering wheel to left and right several times, and keep holding each direction for 10 seconds.
Execution
Initial Diagnosis/Regular Diagnosis
Duration
About 1 second
DTC Type
1 drive cycle
EPS indicator on
Fail Safe Action
Stop or does not start EPS function/assist
(Continue system diagnosis: EPS function/assist will return to normal when the system returns to normal)
Possible Cause
Motor/EPS control unit internal failure

DTC C1404-11: EPS Motor U Phase Circuit Low Voltage
Confirmation Procedure
Basic Condition:
12 volt battery voltage above 7.5 V

Operating Condition:
1.
Start the engine.
2.
Turn the steering wheel to left and right several times, and keep holding each direction for 10 seconds.
Execution
Initial Diagnosis/Regular Diagnosis
Duration
About 1 second
DTC Type
1 drive cycle
EPS indicator on
Fail Safe Action
Stop or does not start EPS function/assist
(Continue system diagnosis: EPS function/assist will return to normal when the system returns to normal)
Possible Cause
Motor/EPS control unit internal failure

DTC C1404-13: EPS Motor U Phase Circuit High Voltage
Confirmation Procedure
Basic Condition:
12 volt battery voltage above 7.5 V

Operating Condition:
1.
Start the engine.
2.
Turn the steering wheel to left and right several times, and keep holding each direction for 10 seconds.
Execution
Regular Diagnosis
Duration
About 1 second
DTC Type
1 drive cycle
EPS indicator on
Fail Safe Action
Continue EPS function/assist (Limited assist (back-up control))
(Continue system diagnosis: EPS function/assist will return to normal when the system returns to normal)
Possible Cause
Motor/EPS control unit internal failure

DTC C1405-11: EPS Motor V Phase Circuit Low Voltage
Confirmation Procedure
Basic Condition:
12 volt battery voltage above 7.5 V

Operating Condition:
1.
Start the engine.
2.
Turn the steering wheel to left and right several times, and keep holding each direction for 10 seconds.
Execution
Initial Diagnosis/Regular Diagnosis
Duration
About 1 second
DTC Type
1 drive cycle
EPS indicator on
Fail Safe Action
Stop or does not start EPS function/assist
(Continue system diagnosis: EPS function/assist will return to normal when the system returns to normal)
Possible Cause
Motor/EPS control unit internal failure

DTC C1405-13: EPS Motor V Phase Circuit High Voltage
Confirmation Procedure
Basic Condition:
12 volt battery voltage above 7.5 V

Operating Condition:
1.
Start the engine.
2.
Turn the steering wheel to left and right several times, and keep holding each direction for 10 seconds.
Execution
Regular Diagnosis
Duration
About 1 second
DTC Type
1 drive cycle
EPS indicator on
Fail Safe Action
Continue EPS function/assist (Limited assist (back-up control))
(Continue system diagnosis: EPS function/assist will return to normal when the system returns to normal)
Possible Cause
Motor/EPS control unit internal failure

DTC C1406-11: EPS Motor W Phase Circuit Low Voltage
Confirmation Procedure
Basic Condition:
12 volt battery voltage above 7.5 V

Operating Condition:
1.
Start the engine.
2.
Turn the steering wheel to left and right several times, and keep holding each direction for 10 seconds.
Execution
Initial Diagnosis/Regular Diagnosis
Duration
About 1 second
DTC Type
1 drive cycle
EPS indicator on
Fail Safe Action
Stop or does not start EPS function/assist
(Continue system diagnosis: EPS function/assist will return to normal when the system returns to normal)
Possible Cause
Motor/EPS control unit internal failure

DTC C1406-13: EPS Motor W Phase Circuit High Voltage
Confirmation Procedure
Basic Condition:
12 volt battery voltage above 7.5 V

Operating Condition:
1.
Start the engine.
2.
Turn the steering wheel to left and right several times, and keep holding each direction for 10 seconds.
Execution
Regular Diagnosis
Duration
About 1 second
DTC Type
1 drive cycle
EPS indicator on
Fail Safe Action
Continue EPS function/assist (Limited assist (back-up control))
(Continue system diagnosis: EPS function/assist will return to normal when the system returns to normal)
Possible Cause
Motor/EPS control unit internal failure

DTC C1420-29: Main Torque Sensor and Sub Torque Sensor Incorrect Correlation
Confirmation Procedure
Basic Condition:
Torque sensor power supply voltage 4.5 - 5.5 V

Operating Condition:
1.
Start the engine.
2.
Turn the steering wheel to left and right several times, and keep holding each direction for 10 seconds.
Execution
Initial Diagnosis/Regular Diagnosis
Duration
About 1 second
DTC Type
1 drive cycle
EPS indicator on
Fail Safe Action
Stop or does not start EPS function/assist
(Continue system diagnosis: EPS function/assist will return to normal when the system returns to normal)
Possible Cause
Motor/EPS control unit internal failure

DTC C1421-14: Main Torque Sensor Malfunction
Confirmation Procedure
Basic Condition:
Torque sensor power supply voltage 4.5 - 5.5 V

Operating Condition:
1.
Start the engine.
2.
Turn the steering wheel to left and right several times, and keep holding each direction for 10 seconds.
Execution
Initial Diagnosis/Regular Diagnosis
Duration
About 1 second
DTC Type
1 drive cycle
EPS indicator on
Fail Safe Action
Stop or does not start EPS function/assist
(Continue system diagnosis: EPS function/assist will return to normal when the system returns to normal)
Possible Cause
Motor/EPS control unit internal failure

DTC C1422-14: Sub Torque Sensor Malfunction
Confirmation Procedure
Basic Condition:
Torque sensor power supply voltage 4.5 - 5.5 V

Operating Condition:
1.
Start the engine.
2.
Turn the steering wheel to left and right several times, and keep holding each direction for 10 seconds.
Execution
Initial Diagnosis/Regular Diagnosis
Duration
About 1 second
DTC Type
1 drive cycle
EPS indicator on
Fail Safe Action
Stop or does not start EPS function/assist
(Continue system diagnosis: EPS function/assist will return to normal when the system returns to normal)
Possible Cause
Motor/EPS control unit internal failure

DTC C1423-14: Torque Sensor Power Source Circuit Malfunction
Confirmation Procedure
Basic Condition:
12 volt battery voltage above 7.5 V

Operating Condition:
1.
Start the engine.
2.
Turn the steering wheel to left and right several times, and keep holding each direction for 10 seconds.
Execution
Initial Diagnosis/Regular Diagnosis
Duration
About 1 second
DTC Type
1 drive cycle
EPS indicator on
Fail Safe Action
Stop or does not start EPS function/assist
(Continue system diagnosis: EPS function/assist will return to normal when the system returns to normal)
Possible Cause
Motor/EPS control unit internal failure

DTC C1432-62: Vehicle Speed and the Engine Speed Incorrect Correlation
Confirmation Procedure
Basic Condition:
12 volt battery voltage above 10 V
IG voltage continued more than 10 V more than 5 seconds

Operating Condition:
1.
Start the engine.
2.
Test-drive the vehicle for at a steady speed for 13 mph (20 km).
(Drive the vehicle in this manner only if the traffic regulations and ambient conditions allow.)
Execution
Initial Diagnosis/Regular Diagnosis
Duration
About 60 seconds
DTC Type
1 drive cycle
EPS indicator on
Fail Safe Action
Continue EPS function/assist (Limited assist)
(Continue system diagnosis: EPS function/assist will return to normal when the system returns to normal)
Possible Cause
PCM internal failure
Motor/EPS control unit internal failure
Vehicle speed sensor failure

DTC U0029-00: F-CAN Malfunction (Bus-Off)
Confirmation Procedure
Basic Condition:
12 volt battery voltage above 10 V
IG voltage continued more than 10 V more than 5 seconds

Operating Condition:
1.
Start the engine and wait more than 5 seconds.
Execution
Initial Diagnosis/Regular Diagnosis
Duration
About 10 seconds
DTC Type
1 drive cycle
EPS indicator on
Fail Safe Action
Continue EPS function/assist (Limited assist)
(Continue system diagnosis: EPS function/assist will return to normal when the system returns to normal)
Possible Cause
Open, Short, or Poor connection between the EPS control unit and a various unit (F-CAN_H, F-CAN_L lines)*1
CAN gateway internal failure*2
Motor/EPS control unit internal failure
*1: Without CAN gateway
*2: With CAN gateway

DTC U0100-00: F-CAN Malfunction (EPS Control Unit-PCM)
Confirmation Procedure
Basic Condition:
12 volt battery voltage above 10 V
IG voltage continued more than 10 V more than 5 seconds

Operating Condition:
1.
Start the engine.
2.
Wait more than 60 seconds after the EPS indicator goes off.
Execution
Initial Diagnosis/Regular Diagnosis
Duration
About 60 seconds
DTC Type
1 drive cycle
EPS indicator on
Fail Safe Action
Continue EPS function/assist (Alternative assist or limited assist)
(Continue system diagnosis: EPS function/assist will return to normal when the system returns to normal or if normalcy can receive signal via the F-CAN lines)
Possible Cause
Open or Poor connection between the EPS control unit and the PCM (F-CAN_H, F-CAN_L lines)*1
Open or Poor connection between the EPS control unit and the CAN gateway (F-CAN B_H, F-CAN B_L lines)*2
Open or Poor connection between the PCM and the CAN gateway (F-CAN A_H, F-CAN A_L lines)*2
CAN gateway internal failure*2
PCM internal failure
Motor/EPS control unit internal failure
*1: Without CAN gateway
*2: With CAN gateway

DTC U0122-00: F-CAN Malfunction (EPS Control Unit-VSA Modulator-Control Unit)
Confirmation Procedure
Basic Condition:
12 volt battery voltage above 10 V
IG voltage continued more than 10 V more than 5 seconds

Operating Condition:
1.
Start the engine.
2.
Wait more than 60 seconds after the EPS indicator goes off.
Execution
Initial Diagnosis/Regular Diagnosis
Duration
About 60 seconds
DTC Type
1 drive cycle
EPS indicator on
Fail Safe Action
Continue EPS function/assist (Alternative assist or limited assist)
(Continue system diagnosis: EPS function/assist will return to normal when the system returns to normal or if normalcy can receive signal via the F-CAN lines)
Possible Cause
Open or Poor connection between the EPS control unit and the VSA modulator-control unit (F-CAN_H, F-CAN_L lines)*1
Open or Poor connection between the EPS control unit and the CAN gateway (F-CAN B_H, F-CAN B_L lines)*2
Open or Poor connection between the VSA modulator-control unit and the CAN gateway (F-CAN B_H, F-CAN B_L lines)*2
CAN gateway internal failure*2
VSA modulator-control unit internal failure
Motor/EPS control unit internal failure
*1: Without CAN gateway
*2: With CAN gateway

DTC U0126-00: F-CAN Malfunction (EPS Control Unit-Steering Angle Sensor)
Confirmation Procedure
Basic Condition:
12 volt battery voltage above 10 V
IG voltage continued more than 10 V more than 5 seconds

Operating Condition:
1.
Start the engine.
2.
Wait more than 60 seconds after the EPS indicator goes off.
Execution
Initial Diagnosis/Regular Diagnosis
Duration
About 1 second
DTC Type
1 drive cycle
EPS indicator on
Fail Safe Action
Continue EPS function/assist (Limited assist)
(Continue system diagnosis: EPS function/assist will return to normal when the system returns to normal)
Possible Cause
Open or Poor connection between the EPS control unit and the steering angle sensor (F-CAN_H, F-CAN_L lines)*1
Open or Poor connection between the EPS control unit and the CAN gateway (F-CAN B_H, F-CAN B_L lines)*2
Open or Poor connection between the steering angle sensor and the CAN gateway (F-CAN B_H, F-CAN B_L lines)*2
CAN gateway internal failure*2
Steering angle sensor failure
Motor/EPS control unit internal failure
*1: Without CAN gateway
*2: With CAN gateway

DTC U0416-68: VSA System Malfunction
Confirmation Procedure
Basic Condition:
12 volt battery voltage above 10 V
IG voltage continued more than 10 V more than 5 seconds

Operating Condition:
1.
Start the engine.
2.
Wait more than 60 seconds after the EPS indicator goes off.
Execution
Regular Diagnosis
Duration
About 30 seconds
DTC Type
1 drive cycle
EPS indicator on
Fail Safe Action
Continue EPS function/assist (Limited assist)
(Continue system diagnosis: EPS function/assist will return to normal when the system returns to normal)
Possible Cause
VSA modulator-control unit internal failure
VSA related parts failure

DTC U129C-00: F-CAN Malfunction (EPS Control Unit-Driving Support System Control Unit) (With LKAS)
Confirmation Procedure
Basic Condition:
12 volt battery voltage above 10 V
IG voltage continued more than 10 V more than 5 seconds

Operating Condition:
1.
Start the engine.
2.
Wait more than 60 seconds after the EPS indicator goes off.
Execution
Regular Diagnosis
Duration
Within 60 seconds
DTC Type
1 drive cycle
EPS indicator off
Fail Safe Action
Does not start LKAS function/assist
Possible Cause
Open or Poor connection between the EPS control unit and the CAN gateway (F-CAN B_H, F-CAN B_L lines)
Open or Poor connection between the multipurpose camera unit and the CAN gateway (F-CAN B_H, F-CAN B_L lines)
Multipurpose camera unit internal failure
CAN gateway internal failure
EPS motor/control unit internal failure

DTC U1483-68: LKAS Malfunction (Indicator value check) (With LKAS)
Confirmation Procedure
Basic Condition:
12 volt battery voltage above 10 V
IG voltage continued more than 10 V more than 5 seconds

Operating Condition:
1.
Turn the vehicle to the ON mode.
2.
Wait more than 60 seconds after the EPS indicator goes off.
Execution
Regular Diagnosis
Duration
Within 60 seconds
DTC Type
1 drive cycle
EPS indicator off
Fail Safe Action
Does not start LKAS function/assist
Possible Cause
Multipurpose camera unit internal failure

DTC U1483-94: LKAS Malfunction (With LKAS)
Confirmation Procedure
Basic Condition:
12 volt battery voltage above 10 V
IG voltage continued more than 10 V more than 5 seconds

Operating Condition:
1.
Turn the vehicle to the ON mode.
2.
Wait more than 60 seconds after the EPS indicator goes off.
Execution
Regular Diagnosis
Duration
Within 60 seconds
DTC Type
1 drive cycle
EPS indicator off
Fail Safe Action
Does not start LKAS function/assist
Possible Cause
Multipurpose camera unit internal failure

DTC U3000-49: EPS Control Unit Internal Circuit Malfunction
Confirmation Procedure
Basic Condition:
12 volt battery voltage 8.0 - 17.5 V

Operating Condition:
1.
Start the engine.
2.
Turn the steering wheel to left and right several times, and keep holding each direction for 10 seconds.
Execution
Initial Diagnosis/Regular Diagnosis
Duration
About 5 seconds
DTC Type
1 drive cycle
EPS indicator on
Fail Safe Action
Stop does not start EPS function/assist
(Continue system diagnosis: EPS function/assist will return to normal when the system returns to normal)
Possible Cause
Motor/EPS control unit internal failure

DTC U3000-51: ECU Software Update Failure
Confirmation Procedure
Operating Condition:
1.
During the EPS control unit program update.
Execution
Initial Diagnosis
Duration
-
DTC Type
1 drive cycle
EPS indicator on
Fail Safe Action
Does not start EPS function/assist
(EPS function/assist will return to normal when the EPS control unit program update is completed)
Possible Cause
EPS control unit update not completed

DTC U3000-55: EPS Control Unit Internal Malfunction
Confirmation Procedure
Operating Condition:
1.
ECU type not selected.
Execution
Initial Diagnosis
Duration
-
DTC Type
1 drive cycle
EPS indicator blinks
Fail Safe Action
Continue EPS function/assist (Limited assist)
(Continue system diagnosis: EPS function/assist will return to normal when the system returns to normal)
Possible Cause
ECU type not selected
ECU type select tool failure
Motor/EPS control unit internal failure

DTC U3003-16: Battery Voltage Low
Confirmation Procedure
Basic Condition:
Engine speed is above 500 rpm

Operating Condition:
1.
Start the engine.
2.
Turn the steering wheel to left and right several times, and keep holding each direction for 10 seconds.
Execution
Regular Diagnosis
Duration
About 15 seconds
DTC Type
1 drive cycle
EPS indicator on
Fail Safe Action
Stop EPS function/assist
(Continue system diagnosis: EPS function/assist will return to normal when the system returns to normal or 12 volt battery voltage is more than 9.0 V)
Possible Cause
Open, Short to ground, or Poor connection between the EPS control unit and the auxiliary under-dash fuse box (+B EPS line)
Blown fuse (Auxiliary under-dash fuse box No.D1-1 (70 A))
Abnormal 12 volt battery
Motor/EPS control unit internal failure

DTC U3003-17: Battery Voltage High
Confirmation Procedure
Operating Condition:
1.
Start the engine.
2.
Turn the steering wheel to left and right several times, and keep holding each direction for 10 seconds.
Execution
Initial Diagnosis/Regular Diagnosis
Duration
About 1 second
DTC Type
1 drive cycle
EPS indicator blink
Fail Safe Action
Stop EPS function/assist
(Continue system diagnosis: EPS function/assist will return to normal when the system returns to normal or 12 volt battery voltage is less than 16.5 V)
Possible Cause
Alternator failure