What is Kia Service Action SA635?

Service Action SA635 is a technical service bulletin from Kia to improve the Data Connectivity Unit (DCU) software performance in certain 2025 EV6 and 2026 Sportage vehicles. This update addresses issues with remote functions and connected services.

What problems does the Kia DCU software update fix?

This software update resolves issues such as the 'Remote Start/ Remote Climate Control function not working', 'Vehicle Status on the Kia Access App not updating', and 'Connected navigation/routing not functioning properly'.

How do I know if my Kia EV6 or Sportage needs this update?

If you own a 2025 Kia EV6 or 2026 Kia Sportage and experience problems with remote start, the Kia Access App not updating vehicle status, or connected navigation, your vehicle may need this update. You can check with your Kia dealer, referencing Service Action SA635.

Will I be notified by Kia about this service action?

No, Kia is not directly notifying consumers about this service action. It is a repair program performed during the warranty period. Owners should be aware of the symptoms and consult their dealer if they experience them.

Kia EV6 Sportage DCU Software Update (SA635)

Kia has released Service Action SA635 to enhance the Data Connectivity Unit (DCU) software in specific 2025 Kia EV6 and 2026 Kia Sportage models equipped with Kia Connect Services. This Kia DCU software update aims to resolve various connectivity and remote function issues, ensuring optimal performance of your vehicle's smart features.

Why this matters

The Data Connectivity Unit (DCU) is crucial for many modern vehicle functions, especially those relying on remote access and connected services. When the DCU does not operate correctly, it can disrupt convenience features and navigation, impacting the overall user experience. This service action ensures these critical systems function as intended.

Symptoms of DCU issues

Owners of affected 2025 Kia EV6 and 2026 Kia Sportage vehicles may experience one or more of the following symptoms related to the DCU:

"Remote Start/ Remote Climate Control function not working"
"Vehicle Status on the Kia Access App not updating"
"Connected navigation/routing not functioning properly"

If you notice any of these issues, your vehicle may require the Kia DCU software update.

Important warnings for owners

Kia has provided several critical notices regarding this service action:

"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."
"Before attempting an ECU upgrade on any Kia model, make sure to first determine whether the applicable model is equipped with an immobilizer security system. Failure to follow proper procedures may cause the PCM to become inoperative after the upgrade and any claims associated with this repair may be subject to chargeback."
"DO NOT start the engine during ECU upgrade."
"DO NOT turn the ignition key 'OFF' or interrupt the power supply during ECU upgrade."
"Be careful not to disconnect the VCI-II connected to the vehicle during the ECU upgrade procedure."
"Damaged VCI II units should not be used and promptly replaced."
"ONLY use approved ECU upgrade software designated for the correct application."
"If the automatic upgrade fails, turn the ignition 'OFF' for about 10 seconds then place it back in the 'ON' position to reset the control unit BEFORE performing the manual upgrade."

Repair procedure summary

The Kia DCU software update involves reprogramming the Data Connectivity Unit (DCU) using the Kia Diagnostic System (KDS) tablet. For EV6 (CV1a) models, a specific 'Service Mode' must be enabled before the update:

Open the driver door and keep it open throughout the process.
Press the ignition 'Power ON' button once without depressing the brake pedal.
Press and hold the right side 'MUTE' button on the steering wheel while pressing the left side 'UP/DOWN' button UPWARDS five times.
Confirm 'Service Mode' is displayed in the instrument cluster.

Once the vehicle is ready, a technician will connect the KDS tablet and perform the software upgrade. The process typically uses 'Auto Mode' for the ECU upgrade, but 'Manual Mode' may be used if 'Auto Mode' fails. After the upgrade, the ignition must be turned 'OFF' for 10 seconds before starting the engine.

Required tools and parts

Technicians will use specialized equipment for this service action:

Kia Diagnostic System (KDS)
ECI Adapter: Part Number GIT1XDDMN057 or GIT0XDDMN052 (required if using VCI-II)
VCI-III Connector: Part Number GITGOVKNNN006 (connects directly to KDS)

Software and ROM ID information

This service action updates the DCU software. The specific upgrade events and ROM IDs are as follows:

Upgrade Event #872 (CV1a) for EV6

System: DCU
ECU P/No.: 96510XG100
Previous ROM ID: 120.NA.011870.011870, 120.NA.011951.011951
New ROM ID: 120.NA.012054.012054
Manual Mode Password: 1897

Upgrade Event #873 (NQ5a) for Sportage

System: DCU
ECU P/No.: 96510P1720
Previous ROM ID: 120.NA.011870.011870, 120.NA.011951.011951
New ROM ID: 120.NA.012054.012054
Manual Mode Password: 8473

Technicians must refer to TSB SST081 for detailed software upgrade instructions.

Warranty information

This service action is covered under warranty. The applicable codes are:

N Code: N99
C Code: C99

Labor Operation Codes:

Sportage (NQ5a): 250A60RO (0.4 M/H)
EV6 (CV1a): 250A35RO (0.4 M/H)

Owners should note that Kia is not notifying consumers directly about this service action. It is performed during the warranty period, and dealers must obtain DPSM approval for repairs outside this period.

Source: NHTSA ID 11026827