NHTSA ID Number: 11029496
Manufacturer Communication Number: 26-01-021H TSB
TSB/Document Date: 2026-03-04
Summary
Certain Palisade Hybrid
(LX3 HEV) vehicles equipped with the 2.5T-GDI HEV engine may set DTC P050500/P050600. This bulletin provides instructions to perform a software update on the Engine Control Module (ECM) to resolve this condition.
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TSB/Document ID: 26-01-021H TSB
Replacement Service Bulletin Number:
MFR Communication Date: 2026-02-24
MFR Internal Campaign ID/Software Version: LA16
Communication Type: Service Campaign
NHTSA Components: ENGINE
MFR Component System:
MFR Component Subsystem:
Previous TSB | Next TSB |
GROUP
NUMBER
CAMPAIGN
Technical Service Bulletin
SUBJECT:
DATE
26-01-021H
MODEL(S)
FEBRUARY 2026
PALISADE HYBRID
(LX3 HEV)
ECM SOFTWARE UPDATE – DTC P050500, P050600
(LIMITED COVERAGE CAMPAIGN LA16)
IMPORTANT
Dealers must perform this field action on all affected vehicles within 8 / 80,000 Emissions Warranty
prior to customer retail delivery and whenever an affected vehicle is in the shop for any
maintenance or repair. See Warranty Information section for more details.
Access the “Vehicle Information” screen via WebDCS to verify “Warranty Start Date” and ensure the
vehicle is within Emission Warranty, observing mileage prior to any repair work.
Description: Certain Palisade Hybrid (LX3 HEV) vehicles equipped with the 2.5T-GDI HEV engine
may set DTC P050500/P050600. This bulletin provides instructions to perform a software update on
the Engine Control Module (ECM) to resolve this condition.
• P050500 Idle Air Control System
• P050600 Idle Air Control System – RPM Lower than Expected
Applicable Vehicles (Certain):
Model Year
Model
Engine
Production Dates
2026
Palisade Hybrid (LX3 HEV)
2.5T
08/11/2025 – 09/30/2025
SST Information:
Tool Name
Tool Number
VCI 3
G0VHNNN06
Figure
Ordering Information
Website:
https://hyundaiessentialtools.com/
Email:
[email protected]
VCI 2
G1XDDMN001
Phone: 1-855-763-9199
Hours: 7 AM – 7 PM CST
NOTE: VCI 2 can NO longer be ordered but can be used for the updates in this TSB.
Circulate To: General Manager, Service Manager, Parts Manager, Warranty Manager, Service
Advisors, Technicians, Body Shop Manager, Fleet Repair
ECM SOFTWARE UPDATE – DTC P050500, P050600
(LIMITED COVERAGE CAMPAIGN LA16)
SUBJECT:
GDS Information:
Model
System
Event Number*
Description
Palisade Hybrid
LX3 HEV ECU S/W TO IMPROVE DTC
ENGINE
1323
(LX3 HEV)
P0505/P0506 MISDIAGNOSIS
(*or use a later available event listed in the GDS ENGINE Update screen if one is available.)
Warranty Information:
Model
Op. Code
Operation
Op.
Time
Causal Part
Nature
Code
Cause
Code
Palisade Hybrid
50D260R0 ECM Software Update 0.3 M/H
391X6-2S003
I11
ZZ3
(LX3 HEV)
NOTE 1: Submit claim on Claim Entry Screen as “Campaign” type.
NOTE 2: 8/80,000 Emissions Warranty applies to the part(s) and repair procedure(s) outlined in this
TSB. Prior to beginning any repair work, ensure the part(s) associated with the repair procedure are
within NVLW, observing mileage and Warranty Start Date or date of first use. If the subject part(s) are
out of warranty coverage, the dealer has the option to submit a PA Request for goodwill consideration
on a case-by-case basis.
NOTE 3: If any part(s) not subject to this TSB are found in need of replacement while performing the
repair procedure, and the affected part(s) are still under warranty, the dealer may submit a separate
claim using the same repair order. If the part(s) not subject to this TSB are out of warranty coverage,
the dealer has the option to submit a PA Request for goodwill consideration on a case-by-case basis.
NOTE 4: This TSB includes repair validation photos. Op times include VIN, mileage, and photo
capture of the ECU Update “Success” result screen as outlined in the Digital Documentation Policy.
ROM ID Information:
ROM ID
Model
Event
System
ECU
Part Number
Current
Latest
Palisade
Hybrid
(LX3 HEV)
1323
ENGINE
391X6-2S003
2571LXXHHMXXXX9E
2591LXXHHMXXXX9F
TSB #: 26-01-021H
Page 2 of 6
SUBJECT:
ECM SOFTWARE UPDATE – DTC P050500, P050600
(LIMITED COVERAGE CAMPAIGN LA16)
Service Procedure:
DIGITAL DOCUMENTATION
This TSB includes repair validation photos. Refer to the latest Warranty Digital Documentation
Policy for requirements.
NOTICE
You must initially perform the GDS ECU update in Auto Mode.
• If the ECU update starts but then fails in Auto Mode, perform the update in Manual Mode
to recover.
NOTICE
Ensure the vehicle’s battery charge is above 11.0 Volts and the tablet’s battery charge is above
30% before performing a software update to avoid update failure.
i
Information
•
Turn OFF all lamps (do NOT leave head lamp switch in auto mode) and all accessories.
•
Perform update with the ignition switch in the ON position.
•
Do NOT disconnect any cables connected to the vehicle or scan tool during the update.
•
Do NOT place in Ready mode during the update.
•
Do NOT turn OFF the ignition switch during the update.
TSB #: 26-01-021H
Page 3 of 6
ECM SOFTWARE UPDATE – DTC P050500, P050600
(LIMITED COVERAGE CAMPAIGN LA16)
SUBJECT:
ECM Update Procedure
1.
Perform the ECU update in Auto Mode.
i
Information
Refer to TSB # 25-GI-011H, “ECU
Update Procedure for Tablet-Based
GDS-Smart”, for additional information.
2.
Verify the ROM ID by selecting the ENGINE
system to scan the vehicle’s current ROM ID.
NOTICE
Check the current ROM ID version and
compare it to the ROM ID Information
table before attempting to perform the
software update.
NOTICE
If the update fails, remove the power
connector from the in-cabin fuse box for
at least 5 seconds. Alternatively,
disconnect the negative (–) 12V battery
terminal and wait at least 5 seconds.
Reassemble and retry the update.
TSB #: 26-01-021H
Page 4 of 6
ECM SOFTWARE UPDATE – DTC P050500, P050600
(LIMITED COVERAGE CAMPAIGN LA16)
SUBJECT:
3.
After the ECU update process shows 100%
complete, follow the prompts on the screen to
cycle the ignition OFF for at least 10 seconds
to reset the control unit (certain models may
take up to 30 seconds).
i
Information
Use the Refresh button to reset the
timer.
4.
DIGITAL
DOCUMENTATION
Using the tablet or GDS screen capture
function, take a screenshot of the ECU
Update “Success” result screen.
Upload the photo to STUI.
NOTE: The VIN/Date/Time/Mileage photo
imprint is NOT required for GDS
screenshots.
TSB #: 26-01-021H
Page 5 of 6
SUBJECT:
ECM SOFTWARE UPDATE – DTC P050500, P050600
(LIMITED COVERAGE CAMPAIGN LA16)
5.
Perform an All Systems Fault Code search
and erase DTC history that had incidentally
occurred from the ECU update.
6.
Place in Ready mode to confirm proper
operation of the vehicle.
7.
The service procedure is now complete.
NOTICE
If the ECU update fails in Auto Mode, perform the update in Manual Mode using the password(s)
below.
Manual Mode Password:
Event
Menu
Password
1323
LX3 HEV 2.5T-GDI ECU 391X6-2S003
5160
TSB #: 26-01-021H
Page 6 of 6
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