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Electronic Power Steering
(EPS)
NOTE: Certain models have been produced with
electronic power steering. The following information
is intended to be used when servicing these models.
The electronic power steering (EPS) system is an elec-
tro-mechanical device that utilizes 12-volt DC power to
drive a motor linked to the steering shaft to assist the
rider when rotating the handlebar. Rider steering inputs
are detected by a torque-sensing transducer assembly
within the EPS housing. These inputs are converted to
electronic signals by the transducer and control circuitry
to tell the motor which way to drive the steering shaft.
When no steering input (pressure on the handlebar) is
detected, no torque signal is generated, and no steering
assist is provided by the motor.
If an electrical-related EPS system malfunction occurs, a
diagnostic trouble code (DTC) will be displayed on the
LCD gauge. Check for updates and verify any active
DTCs using the most up-to-date Dealer Diagnostic Sys-
tem software. The following is a list of DTCs, possible
conditions, and causes.
NOTE: If no active codes are present on the LCD
gauge or verified through the Dealer Diagnostic Sys-
tem and the vehicle is experiencing steering-related
issues, there may be a mechanical steering-related
issue. In this case, the EPS is not the cause of the issue.
Components that may contribute to this type of issue
could be abnormal tire wear, bad wheel bearings, ball
joints, tie rod ends, tie rods, or bushings. Check the
complete steering system for any sign of wear or mis-
alignment.
NOTE: If any code C1306-C1315 or C1317-C1325
are active and verified with the Dealer Diagnostic
System, EPS replacement is not necessary. Follow
the instructions listed in the chart to correct the mal-
function.
Component data and system updates can be
retrieved/performed using the Dealer Diagnostic Sys-
tem. Navigate the screens as required.
Code Fault Description Fault Condition Possible Cause Fault Recovery Method
C1301 Over Current EPS internal over-current condition
has been detected
Internal EPS Condition Correct EPS condition*
C1302 Excessive Current Error EPS internal current measurement
error has been detected
Internal EPS Condition Correct EPS condition*
C1303 Torque Sensor Range FaultEPS internal torque sensor range
condition has been detected
Internal EPS Condition Correct EPS condition*
C1304 Torque Sensor Linearity
Fault
EPS internal torque sensor linearity
condition has been detected
Internal EPS Condition Correct EPS condition*
C1305 Rotor Position Encoder EPS internal rotor position encoder
condition has been detected
Internal EPS Condition Correct EPS condition*
C1306 System Voltage Low EPS battery power low-voltage
condition has been detected
System voltage low (less than 11 VDC at
the EPS). Wire harness issue, faulty
voltage regulator, weak battery or loose
battery terminals.
EPS will auto-recover when the
battery supply returns to normal
C1307 System Voltage High EPS battery power over-voltage
condition has been detected
System voltage high (more than 16 VDC at
the EPS). Wire harness issue, faulty
voltage regulator or loose battery terminals.
EPS will auto-recover when the
battery supply returns to normal
C1308 Temperature Above 230° F
(110° C)
EPS internal 230° F (110° C)
over-temp condition has been
detected
Debris in EPS housing/cooling fan Clean the EPS housing and
cooling fins. EPS will auto-recover
when internal temperature drops
below 221° F (105° C)
C1309 Temperature Above 248° F
(120° C)
EPS internal 248° F (120° C)
over-temp condition has been
detected
Debris in EPS housing/cooling fan Clean the EPS housing and
cooling fins. EPS will auto-recover
when internal temperature drops
below 239° F (115° C)
C1310 Vehicle Speed High Vehicle speed signal received by the
EPS exceeds the maximum speed
specification
Intermittent main harness wires, defective
speed-sensor, or intermittent speed sensor
wires
EPS will auto-recover when the
vehicle speed signal drops below
the maximum speed specification
C1311 Vehicle Speed Low Vehicle speed signal received by the
EPS is zero or missing
Broken main harness wires, defective
speed-sensor, or broken speed sensor
wires
EPS will auto-recover when the
vehicle speed signal returns to
normal
C1312 Vehicle Speed Faulty Vehicle speed CAN signal received by
the EPS incorrect or missing
Broken main harness CAN wires, defective
speed-sensor, or broken speed sensor
wires
EPS will auto-recover when the
vehicle speed signal returns to
normal
C1313 Engine RPM High Engine RPM signal received by the
EPS exceeds the maximum RPM
specification
Intermittent main harness RPM wires,
intermittent voltage regulator, intermittent
ACG stator wires
EPS will auto-recover when engine
RPM signal drops below the
maximum RPM specification
C1314 Engine RPM Low Engine RPM signal received by the
EPS suddenly dropped below 500
RPM
Handlebar switch in the “OFF” position,
broken main harness RPM wires, defect
voltage regulator, broken ACG stator wires
EPS will auto-recover when engine
RPM signal returns to normal
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