GROUP

MODEL

ELE

2019-2022MY
Niro EV (DE EV)

NUMBER

DATE

270

April 2023

TECHNICAL SERVICE BULLETIN
SERVICE ACTION: INVERTER COOLANT/DEBRIS
SUBJECT:

FLUSHING/REPLACEMENT FOR CLUSTER MESSAGE
“REFILL INVERTER COOLANT” (SA512)

This bulletin provides information to flush out the inverter low-conductivity coolant on certain 2019-2022MY
Niro EV (DE EV) vehicles produced from May 10, 2019 through October 4, 2021, which may exhibit a “Refill
inverter coolant” message displayed on the instrument cluster due to poor flow of coolant/antifreeze inside
the coolant pipes. In most cases, the inverter reservoir tank coolant may be filled to normal level and no DTC’s
are stored due to an increase operation of the electric water pump (EWP) that is 2,450 RPMs or more when
checked. Follow the procedure outlined in this publication to flush out the low-conductivity coolant/debris
inside the coolant pipe and replace the inverter coolant. Before conducting the procedure, verify that the
vehicle is included in the list of affected VINs.

 NOTICE
A Service Action is a repair program without customer notification that is performed during the
warranty period. Any dealer requesting to perform this repair outside the warranty period will
require DPSM approval.
Repair status for a VIN is provided on WebDCS (Service → Warranty Coverage → Warranty Coverage
Inquiry → Campaign Information). Not completed Recall / Service Action reports are available on
WebDCS (Consumer Affairs → Not Completed Recall → Recall VIN → Select Report), which includes

a list of affected vehicles.
This issue number is SA512.

A printed copy is for reference only; publication information can be updated at any time.
Always refer to KGIS for the latest information. After logging in kdealer.com, the newest technical
publications are listed in ‘Service Releases’ and has the latest service information that has been released.

Page 2 of 9
SUBJECT:

INVERTER COOLANT/DEBRIS FLUSHING/REPLACEMENT FOR
CLUSTER MESSAGE “REFILL INVERTER COOLANT” (SA512)

Repair Procedure:
1.

If the vehicle has General Type Coolant (green),
this service action does not apply.
Submit a KVID photo of the green coolant filled
reservoir and use Op Code 230020R2.
If the vehicle has Low-Conductivity Coolant
(blue), continue to step 2.

2.

Select ‘Data Analysis’ icon.

3.

Select ‘BMS’ icon.

4.

Ensure the ‘Battery BTMS Valve Control Mode’
is in ‘Combined Mode’.

 NOTICE
If ‘Battery BTMS Valve Control Mode’

is in ‘Separated Mode’, turn the
ignition ‘ON’ and ‘OFF’ to change to
‘Combined Mode’.

Printed TSB copy is for reference only; information may be updated at any time. Always refer to KGIS for the latest information.

TSB: SA512 Niro EV (DE EV) April 2023

Page 3 of 9

INVERTER COOLANT/DEBRIS FLUSHING/REPLACEMENT FOR

SUBJECT:

5.

CLUSTER MESSAGE “REFILL INVERTER COOLANT” (SA512)
Refer

to

Machine

TSB

SST080

Guide’

for

maintenance/cleaning

‘Coolant
initial

Flushing

setup

instructions

and
before

beginning work.

6.

Open the hood and remove the service
interlock connector (A).

A
+
7.

Remove the coolant reservoir cap (C).

B
 NOTICE
Coolant reservoir cap has reverse
threads.

C

8.

Drain the coolant from the reservoir (C) into an
empty container using the SST kit ‘syphon

D

pump’ (D).

C

Printed TSB copy is for reference only; information may be updated at any time. Always refer to KGIS for the latest information.

TSB: SA512 Niro EV (DE EV) April 2023

Page 4 of 9

INVERTER COOLANT/DEBRIS FLUSHING/REPLACEMENT FOR

SUBJECT:

9.

CLUSTER MESSAGE “REFILL INVERTER COOLANT” (SA512)

Remove the two (2) inlet (E) and outlet (F)
circulation hoses from the coolant reservoir (C).

10.

C
F

Connect the Inlet/Outlet hoses from the
flushing machine to the detached circulation
hoses (E and F) as shown.

E
11.

Close the reservoir degassing valve (G).

 NOTICE
If the reservoir tank degassing hose
does not have a valve, cut off the flow
using a hose pinch-off plier.

12.

Turn the ‘Air’ and ‘Pump’ toggle switches on the
flushing machine to the ‘ON’ position to begin
the flushing of the coolant pipe.
Note: Allow machine to run for three (3)
minutes.

13.

After the three (3) minutes have passed, turn
the flushing machine ‘Pump’ toggle switch to
the ‘OFF’ position.

Note: Keep the ‘Air’ toggle switch in the ‘ON’
position to drain excess coolant remaining in
line for at least thirty (30) seconds.

Printed TSB copy is for reference only; information may be updated at any time. Always refer to KGIS for the latest information.

TSB: SA512 Niro EV (DE EV) April 2023

G

Page 5 of 9

INVERTER COOLANT/DEBRIS FLUSHING/REPLACEMENT FOR

SUBJECT:

14.

CLUSTER MESSAGE “REFILL INVERTER COOLANT” (SA512)
Reconnect the two (2) inlet (E) bottom, and
outlet (F) upper circulation hoses to the
reservoir (C).

C
F

E

15.

Remove the Motor & Reduction Gear under
cover (H).

Tightening torque for bolts:
2.9 – 4.3 lb.ft (3.9 – 5.9 N.m)

H
16.

Remove the HV Battery lower cover (I).

Tightening torque for bolts:
2.9 – 4.3 lb.ft (3.9 – 5.9 N.m)

I
17.

Disconnect the lower radiator hose (J).

 NOTICE
Capture the drained coolant into the
drain pan.

J

Printed TSB copy is for reference only; information may be updated at any time. Always refer to KGIS for the latest information.

TSB: SA512 Niro EV (DE EV) April 2023

Page 6 of 9
SUBJECT:

18.

INVERTER COOLANT/DEBRIS FLUSHING/REPLACEMENT FOR
CLUSTER MESSAGE “REFILL INVERTER COOLANT” (SA512)

Remove the adapter from the flushing machine
‘outlet’ hose (K).

19.

Connect the ‘outlet’ hose from the flushing
machine to the radiator connection (K) to the
radiator as shown.

K
20.

Disconnect the electric water pump (EWP) inlet
hose (L).

21.

L

Connect the ‘inlet’ hose from the flushing
machine to the EWP inlet hose (L) as shown.

22.

Turn ‘ON’ the ‘Air’ toggle switch.
Allow machine to run for five (5) minutes.
Note: After five (5) minutes have elapsed, close
the inlet valve (M) and keep the ‘Air’ toggle
switch in the ‘ON’ position to drain excess
coolant remaining in line for at least thirty (30)
seconds.

23.

Detach both of the ‘Inlet/Outlet’ hoses from the
vehicle and then reverse (switch) the flushing
machine ‘Inlet/Outlet’ hoses to the vehicle ‘Inlet’
hose to radiator and ‘Outlet’ hose to EWP.
Allow machine to run for five (5) minutes.

24.

Repeat this step one (1) more time, reversing
(switching) the flushing machine ‘Inlet/Outlet’
hoses (G and H) as outlined in steps 19 and 21.

Printed TSB copy is for reference only; information may be updated at any time. Always refer to KGIS for the latest information.

TSB: SA512 Niro EV (DE EV) April 2023

M

Page 7 of 9

INVERTER COOLANT/DEBRIS FLUSHING/REPLACEMENT FOR

SUBJECT:

25.

CLUSTER MESSAGE “REFILL INVERTER COOLANT” (SA512)
Remove the flushing machine ‘Inlet/Outlet’
hoses from the vehicle and reconnect the lower
radiator hose and EWP inlet hose to the vehicle
in the reverse order of removal.

26.

Disconnect the battery chiller outlet hose (N).

N
27.

Connect the flushing machine inlet hose to the
battery chiller outlet hose (N).

28.

Disconnect the High Voltage Battery (HVB) inlet
hose (O).

29.

O

Connect the flushing machine ‘outlet’ hose to
the HVB inlet as shown.
Allow machine to run for five (5) minutes.

30.

Close the inlet valve (M) and keep the ‘Air’
toggle switch in the ‘ON’ position (refer to step
22) to drain excess coolant remaining in line for
at least thirty (30) seconds.

31.

Remove the flushing machine ‘Inlet/Outlet’
hoses from the vehicle and reconnect the
battery chiller outlet hose (N) to the HVB and
the battery chiller inlet hose (O) to the battery
chiller.
Note: If Equipped with Heat Pump: Proceed to
steps 32 through 36. Otherwise, skip to step 37.

32.

Disconnect the waste heat chiller inlet hose (P).

33.

Connect the flush machine ‘outlet’ hose to the

P

waste heat chiller inlet.

Printed TSB copy is for reference only; information may be updated at any time. Always refer to KGIS for the latest information.

TSB: SA512 Niro EV (DE EV) April 2023

Page 8 of 9
SUBJECT:

INVERTER COOLANT/DEBRIS FLUSHING/REPLACEMENT FOR
CLUSTER MESSAGE “REFILL INVERTER COOLANT” (SA512)

34.

Lower the vehicle.

35.

Disconnect the waste heat chiller outlet hose

Q

(Q) from the coolant reservoir (C).
36.

C

Connect the flush machine ‘inlet’ hose to the
waste heat chiller outlet (Q).
Allow machine to run for five (5) minutes.

37.

Reattach the coolant reservoir (B) hoses in the
reverse order of removal.

38.

Fill the coolant reservoir with the applicable new
coolant/antifreeze.

33.

B

‘Open’ the reservoir tank degassing valve (G).

G

34.

Perform air bleeding procedure using KDS by
running the Motor Control System → Electric
Water Pump Control.
Note: Continue filling the coolant reservoir (B)
with the applicable new coolant/antifreeze as
needed to complete the air bleeding process.

35.

Install the coolant reservoir cap (C) and secure tight.

36.

Confirm normal vehicle operation.
Refer to TSB SST080 ‘Coolant Flushing Machine Guide’ for cleaning instructions after use.

Printed TSB copy is for reference only; information may be updated at any time. Always refer to KGIS for the latest information.

TSB: SA512 Niro EV (DE EV) April 2023

Page 9 of 9

INVERTER COOLANT/DEBRIS FLUSHING/REPLACEMENT FOR

SUBJECT:

CLUSTER MESSAGE “REFILL INVERTER COOLANT” (SA512)

AFFECTED VEHICLE RANGE:
Model

Production Date Range

Niro EV (DE EV)

May 7, 2019 to September 29, 2021

REQUIRED TOOL:
Tool Name

Part Number

Figure

Comments
For service/parts contact:

Coolant/Antifreeze

KQ253 CV158QQK

Flushing Equipment Set

Snap-On Business Solutions
(888) 542-1011

REQUIRED PART:
Part Name

Part Number

Coolant/Antifreeze

UM022 CH270

Figure

Qty.
1
(2.0L)

WARRANTY INFORMATION:
N Code: N99 C Code: C99
Claim
Type

Causal P/N

Qty.

Repair

Labor Op

Op

Replacement

Description

Code

Time

P/N

(SA512)
Coolant Inspection

230020R2

0.2
M/H

Qty.

N/A

0

UM022 CH270

1

(SA512)
Coolant
V

25430 Q4040

0

Flushing/Replacement

230020R1

2.0
M/H

w/ Heat Pump
(SA512)
Coolant
Flushing/Replacement

230020R0

1.8
M/H

w/o Heat Pump
Note: A KVID photo of the green coolant filled reservoir must be taken and attached to the claim using Warranty Claim
Attachment type ‘XX - Other’ for Op Code 230020R2. Claims will be subject to chargeback if photos are not submitted.
Note: Manually enter sublet code ‘X2’ for reimbursement of one roundtrip rideshare expense or up to three (3) days of
rental expense for flushing repairs (Op Code 230020R1 or 230020R0), with supporting documentation.

 NOTICE
VIN inquiry data for this repair is provided for tracking purposes only. Kia retailers should reference
SA512 when accessing the WebDCS system.

Printed TSB copy is for reference only; information may be updated at any time. Always refer to KGIS for the latest information.

TSB: SA512 Niro EV (DE EV) April 2023