Service Campaign 990: HECU Module Dark Current Measurement and
Replacement - Dealer Best Practice
June 01, 2023

Document Topic
• Service Campaign 990: TSB 23-01-036H-1 has been published; supersedes TSB 23-01-036H

Date
06/01/2023

Description of Campaign:

Certain Hyundai Elantra, Sonata, and Santa Fe vehicles may exhibit the Electronic Parking Brake (EPB) warning light on due
to brake fluid entering the HECU (Hydraulic Electronic Control Unit) electrical connector. DTC C1501 (EPB Switch Failure)
may be present, but EPB performance remains unaffected.

Affected Vehicles (certain):
•

•
•

2022MY Elantra (CN7A) equipped with 2.0L engines produced 12/09/2021 - 02/14/2022 (VINs beginning with
“5NP”).
2022MY Sonata (DN8A) equipped with 1.6T and 2.5L engines produced 12/01/2021 - 04/12/2022
(VINs beginning with “5NP”).
2022MY Santa Fe (TMA) equipped with 2.5L and 2.5T engines produced 11/30/2021 - 03/21/2022 (VINs
beginning with “5NM”).

Repair Information:

Inspect the HECU by measuring the dark current at the junction box, and if necessary replace it.
• Recommended Technician Training Level: Hyundai Expert Service Technician (or above)

Recommended Alternative Transportation:

A Service Rental Car (SRC) is recommended if HECU replacement is required.

Warranty Information:

This campaign pays 0.3 M/H for the HECU inspection and 1.5 M/H for the inspection & HECU replacement.
Op time includes pictures using STUI and uploading as portrayed in TSB 23-01-036H-1 (or latest version). If the necessary
pictures are not included, the claim will be subject to debit.
•

Picture 1 (inspection): Must include the dark current measurement and junction box open along with a piece of paper
displaying the last 6 digits of the VIN and date of the repair.
Picture 2 (if HECU replacement required): Must include the newly installed HECU along with the removed original
HECU with the last 6 digits of the VIN and date of the repair.

1

Acceptable Photos of Multimeter Reading (Left) & New HECU Installed with Removed HECU (Right)
Please refer to TSB 23-01-036H-1 (or latest version) for additional details.

Parts Information:
•
•

Please refer to TSB 23-01-036H-1 (or latest version) for the latest parts information.
Please consider the following:
• HECU Unit Assemblies (various part numbers): On CSP (Critical Parts Supply), VIN restrictive.
Dealer will require a valid service campaign 990 VIN to order the part. Due to a limited quantity of
parts inventory, this will assure affected customer vehicles encompassed in the campaign receive
priority part allocation.
• Multimeter DT-830D+ (HK589-DT830QQH): Each dealer was previously shipped 1 multimeter for
this campaign, with arrivals at dealerships starting 05/03/23.

Customer Mailing:

Owners of the affected vehicles are expected to be notified via First Class mail starting by end of June 2023 of a repair
available for their vehicle.

Customer Talk Tracks:

“As a regular practice, every visit to our Hyundai dealership we check your VIN number to see if your vehicle has any open
campaigns or recalls. We did confirm that your vehicle has an open service campaign which requires we inspect the Hydraulic
Electronic Control Unit (HECU) to verify if a fluid leak exists. In some cases, vehicles may exhibit the Electronic Parking Brake
(EPB) warning light on due to brake fluid entering the HECU (Hydraulic Electronic Control Unit) electrical connector. Even if a
fluid leak is present, the operation of the Electric Parking Brake (EPB) operation is not affected. If the inspection reveals that
there is a leak, we will replace the HECU for you at no cost and provide you with a Service Rental Car (SRC) if needed.”

Best Practice Checklist
Reservation: Did you check WebDCS for additional campaigns or recalls?
2

Yes
No
Reservation: Did you explain the total time to preform repair to each customer?
Yes
No
Readiness: Were the appropriate parts ordered as per TSB 23-01-036H-1 (or latest version) if replacement of the
HECU was needed? A valid 990 VIN is required to obtain part.
Yes – Inspection not passed, ordered by VIN.
No – Inspection passed
Readiness: Has the dealer received the 1 multimeter (HK589-DT830QQH) provided free of charge?
Yes
No
Reception: Did you explain to the customer the expected repair time based on the repair?
Yes
No
Reception: Did you offer the customer Alternative Transportation?
Yes
No
Repair: Did you provide the customer with an eMPI?
Yes
No
Repair: Is the Technician a Hyundai Expert Service Technician (or above)?
Yes
No
Repair: Was a picture taken of the multimeter reading of the HECU inspection & if necessary, the new HECU installed
alongside with the removed original HECU with the last 6 digits of the VIN and date of repair per TSB 23-01-036H-1
(or latest version)?
Yes
No
Return: Did you get the customer’s signature on all warranty lines in addition to the final RO?
Yes
No

Contact Reference

Please see the following page for commonly referred to contacts.
Thank you for your prompt attention to this important matter and continued commitment to Hyundai customers.

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Key Contact Information
Dealer Support

Contact Information

Description

Parts

[email protected]
1-800-545-4515

Parts ordering hotline

Techline

1‐800‐325‐6604

Warranty HELPREP Line

1‐877‐446‐2922

Vehicle Technical Support for Hyundai Dealer
Technicians
Warranty Claim questions for Hyundai Dealers

Warranty Prior Approval (PA) Center

[email protected]

Warranty Prior Approval (PA) Center for Hyundai Dealers

Xtime Technical Support

[email protected]
1‐866‐984‐6355

Assistance with Car Care Scheduling:
• Appointment / Shop Capacity Management / Campaign
Integration / Operation Codes

AutoLoop Technical Support

[email protected]
1-877-850-2010

CDK Technical Support

Customer Support
Hyundai Customer Care Center
(Recall /Campaign Questions)
Hyundai Recall /Campaign
Website
Hyundai Customer Care Center
(General Questions)
Hyundai Roadside Assistance

Assistance with Car Care Scheduling:
• Appointment / Shop Capacity Management / Campaign
Integration / Operation Codes
https://serviceconnect.support.cdk. Assistance with Car Care Scheduling:
com/
• Appointment / Shop Capacity Management / Campaign
Integration / Operation Codes
Contact Information
Description
1‐855‐671‐3059
www.hyundaiusa.com/recall
1‐800‐633‐5151
1-800-243-7766

Hyundai Roadside Assistance
Key Reference Information

Name
Campaign Central
Car Care Scheduling (Xtime) Tutorials
Car Care Scheduling (Xtime) - Recall
Appointment Notification

Parts – Campaign Parts
Management (CPM) Procedure
Service Rental Car (SRC) Program

Technical Service Bulletin (TSB)
Uncompleted Campaign VIN Listing
Recall Campaign Website
NHTSA Website

Customer questions or concerns related to recall or
service campaigns
Updated information related to the specific recall or service
campaign
Customers general questions, non‐campaign related

Source
Consolidated repository of recall and service campaign dealer best practices. Located on the service
tab homepage in www.HyundaiDealer.com
www.HyundaiDealer.com > Service > Dealer Resources > Documents Library > Car Care Scheduling
1.
2.
3.
4.
5.

Log into Xtime
Under the menu at the top left, select ‘CONFIGURE’
Under the dealership tab, click “EMAIL COMMUNICATION”
Slide the toggle to “ADVANCED”
Populate as many e-mails as desired in the “PARTS DESK EMAIL FIELD”

As applicable; www.HyundaiDealer.com > Parts > Documents Library > Campaign Parts
Management
SRC Documentation: www.HyundaiDealer.com > Service tab > Documents Library > Service Rental Car
TSD: www.HyundaiDealer.com > Service tab > SRC Fleet Mgmt Software
Insurance: www.HyundaiDealer.com > Service tab > SRC Insurance
www.HyundaiDealer.com > Service tab > Hyundai Tech Info
A listing of vehicles is located on WEBDCS > SERVICE tab > select UNCOMPLETED CAMPAIGN VIN
LISTING
– Dealer Stock (New, SRC, CPO, etc.) and Retailed.
www.hyundaiusa.com/recall
www.safercar.gov

4

Appendix
Historical
• Service Campaign 990: TSB 23-01-036H-1 has been published & campaign resumed; supersedes
existing TSB 23-01-036H
• Service Campaign 990: Temporarily suspended
• Service Campaign 990: TSB 23-01-036H has been published

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Date
06/01/2023
05/24/2023
05/04/2023