C-MDPS ECU (or
C-MDPS Power
Pack Assy).

Motor-Related
C2400
C2401

Replace the
C-MDPS motor
(or C-MDPS
Power Pack
Assy).

Column & HousingRelated
C1259
C1290

Replace the
column & housing
assy.

Connectors / Wiring Related
C1260, C1261, C1611, C1612, C1616,
C1622, C1628, C1646, C1656, C1692,
C1693, C1696, C1697

Check DTC(s) and Wiring at
HECU / C-MDPS / EMS
• Check connectors for poor
connection.
• Check for connector
corrosion.
• Check for connector
damage or deformation.
• Check the DTC Diagnostic
Guide on
HyundaiTechInfo.com

NOTICE




For cases with multiple DTCs:
o If the DTCs relate to more than a single C-MDPS component, it is recommended
to replace the full C-MDPS assembly (56310).
o If the DTCs relate only to a single C-MDPS component, it is recommended to
replace only the suspect component.
DTCs shown are based on the 5-digit DTC system. For vehicles showing 7-digit DTCs,
refer to the DTC that matches only the first 5-digits.

TSB #: 20-ST-001H-2

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C-MDPS COMPONENT REPLACEMENT INFORMATION
C-MDPS DTC Table

DTC

Description

First Inspection Method

C1102

Battery voltage problem

C1603

MDPS thermal protection

C1611
C1616

CAN time out EMS
CAN BUS OFF

C1622

Vehicle speed signal error

Check battery voltage condition.
Investigate driving conditions
DTC is set. This DTC protects
motor from overheating.
1. Check GDS condition.
2. Check wiring and
connector condition.
3. Check ECU CAN line.
4. Check C-MDPS ground.
Check SPAS and associated
wiring.
Check TCU and associated
wiring.
Check instrument cluster and
associated wiring.
Check VSM and associated
wiring.
Reset steering angle sensor
calibration and erase DTC(s).
Check wiring (torque angle
sensor TAS, see below for
details) and connector
condition.
Reset steering angle sensor
calibration.

C1696,
C1697
C1612,
C1646
C1628,
C1656
C1692,
C1693

C1259

C1260
C1261

C1290

SPAS signal error
TCU signal error
Instrument cluster signal error
VSM signal error

Steering angle sensor signal error

Steering angle sensor signal error
Zero-setting error

Torque sensor signal error

First erase DTC, then check
wiring (torque angle sensor
(TAS), see below for details)
and connector condition.
Check wiring and connector
condition between torque sensor
and ECU.

C1112

Torque sensor voltage error

C1704
C1705
C1604
C2413
C2400
C2401

ECU fail-safe relay fault
ECU hardware error
ECU over/discharge error
ECU hardware error
Motor signal error
Motor circuit error

First erase DTC, then check
wiring and connector at ECU.

C2412

Motor voltage supply error

First erase DTC, check wiring
and connector between ECU
and motor.

C1623
C1687

CAN time out SAS
CAN time out VSM

C1688

VSM signal error

1. Check C-MDPS power
connector and fuse.
2. Check C-MDPS ground line.
3. Check C-MDPS ECU / VSM
CAN line.
4. Communication status with
GDS.
5. Check for C1259 -> if present
with these DTCs, replace
column and housing assembly.

TSB #: 20-ST-001H-2

Repair Recommendations
Recharge battery voltage.
No replacement necessary.
Check EMS CAN line.
Check the chassis CAN line.
Check the EMS (Engine ECU).

Repair as necessary.
Erase DTC(s).
Full C-MDPS assy is not to be
replaced.

If DTC returns, replace column &
housing assembly.
If a problem is found with TAS
wiring, replace full C-MDPS assy.
If DTC returns, inspect wiring and
connector condition.
If DTC returns, replace column & ho
using assembly.
If a problem is found with TAS
wiring, replace full C-MDPS assy

If DTC returns, replace C-MDPS
ECU (or Power Pack Assy).

If DTC returns, replace MDPS
motor (or Power Pack Assy).
First replace C-MDPS ECU (or
Power Pack Assy).
If DTC returns, replace C-MDPS
motor (if applicable).
If DTC returns, replace MDPS ECU
(or Power Pack Assy).
If DTC returns and MDPS is
inoperable, replace C-MDPS ECU
(or Power Pack Assy).
If DTC returns and MDPS operation
is normal, continue investigation
into wiring issues.
For TMa, if C1688 occurs along wit
h C1700, replace Power Pack Assy.

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C-MDPS COMPONENT REPLACEMENT INFORMATION
Torque Angle Sensor (TAS) Wiring Inspection

In the presence of DTC C1259 (steering angle sensor signal error) and/or C1290 (torque sensor
signal error), inspect the condition of the TAS wiring.
Remove the grommet (A) and check the wiring on both TAS side (B) and ECU side (C). Check for
damage, push-back, or improper connection.

If any issues are found in this harness, replace the full C-MDPS (part number starting with 56310)
assembly.

TSB #: 20-ST-001H-2

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C-MDPS COMPONENT REPLACEMENT INFORMATION
Steering Noise Repair Information
DAB wiring

Clock spring

Vehicle in dealer for C-MDPS noiserelated concern.

1. Check steering wheel area
• Check correct condition of driver air bag wiring (DAB,
clock spring, multifunction switch).
 Repair as appropriate.

2. Check C-MDPS mounting area
• Check cowl mounting bolts (check below C-MDPS
mounting bolts)
• Check cowl cross member mounting bolts.
 Tighten bolts to the specified torque in the shop
manual.

3. Check steering intermediate shaft U-joint bolts.
• Remove and check U-joint assembly for noise.
 Replace shaft or tighten bolts to the specified torque
in the shop manual.


NOTICE: If the pinch bolts on either ends of the
steering universal joint assembly are removed,
the bolts cannot be reused during reassembly.

4.
•
•


Check steering gear box
Check mounting bolts
Check steering gear assembly for noise.
Tighten bolts to the specified torque in the shop
manual; replace parts as necessary.

Multifunction switch

C-MDPS
mounting

Cowl mounting

Steering shaft
U-joints

Steering gear box

Tie-rod end ball joint

5. Check tie-rod end ball joint free play.
 Replace parts as necessary.

6. Check C-MDPS assembly.
• Locate source of noise using chassis ears.
• Refer to C-MDPS Assembly Noise Information.
 Replace part with noise as necessary.

TSB #: 20-ST-001H-2

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C-MDPS COMPONENT REPLACEMENT INFORMATION
C-MDPS Assembly Noise Information

NOTICE



Use Chassis Ears (SST #J-39570) attached to the areas shown below to isolate source
of noise within C-MDPS assembly.
One way to verify that the source of noise is the column & housing assembly is to
remove the part, and turn the assembly with the C-MDPS motor removed, as shown
below.

Method #1
Use intermediate shaft to
turn steering column.

Method #2
Use pliers with a shop
towel to turn steering
column.

TSB #: 20-ST-001H-2

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1.

C-MDPS COMPONENT REPLACEMENT INFORMATION

Small bearing noise –
Growling/grinding/bearing noise
https://youtu.be/22PI3hAEfnk

Check for this noise at the worm gear area,
as shown.
If the noise source is confirmed from this
location:
 Replace the worm gear assembly.
Refer to the appropriate “C-MDPS
Worm Shaft Bearing Noise” TSB
20-ST-002H-2 or 20-ST-003H-1.

2.

Ticking noise –
Check for this noise on the column &
housing as shown.
If the noise source is confirmed from this
location:
 Replace the column & housing
assembly.

TSB #: 20-ST-001H-2

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3.

C-MDPS COMPONENT REPLACEMENT INFORMATION

Motor noise –
Check the motor for noise.
If the noise source is confirmed from this
location:
 Replace the C-MDPS motor or
C-MDPS Electric Power Pack (as
appropriate).

TSB #: 20-ST-001H-2

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