Recall 248 – Software Error May Cause Unintended Acceleration – 2021-2023 Hyundai Elantra HEV

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August 18, 2023 NHTSA CAMPAIGN NUMBER: 23V589000

Software Error May Cause Unintended Acceleration

Unintended vehicle acceleration can increase the risk of a crash.

 

NHTSA Campaign Number: 23V589

Manufacturer Hyundai Motor America

Components ELECTRICAL SYSTEM, VEHICLE SPEED CONTROL

Potential Number of Units Affected 37,997

 

Summary

Hyundai Motor America (Hyundai) is recalling certain 2021-2023 Elantra HEV vehicles. A software error in the motor control unit may cause unintended vehicle acceleration after the brake pedal is released.

 

Remedy

Dealers will update the motor control unit software, free of charge. Owner notification letters are expected to be mailed October 17, 2023. Owners may contact Hyundai customer service at 1-855-371-9460. Hyundai’s number for this recall is 248.

 

Notes

Owners may also contact the National Highway Traffic Safety Administration Vehicle Safety Hotline at 1-888-327-4236 (TTY 1-800-424-9153), or go to www.nhtsa.gov.

 

Check if your Hyundai has a Recall

 


Recall Description

The motor control unit (“MCU”) software may detect a transmission / drive motor synchronization fault while driving which can trigger a “fail-safe” condition that temporarily results in slow, unintended acceleration after release of the brake pedal.  Service brake functionality is unaffected and remains fully operational. Unintended acceleration could increase the risk of a crash.

 

Applicable Vehicles (Certain)

  • 2021-23MY Elantra Hybrid (CN7 HEV) equipped with 1.6L GDI engines produced 12/15/2020 – 07/29/2023

 

Remedy Information

  • Required GDS Information Selection: System: MCU, Event # 1025
  • Recommended Service Technician Training Level: Hyundai Certified (or above)

TSB 23-01-070H (or latest version) provides information related updating the Motor Control Unit (MCU) software on the vehicle via the Hyundai GDS.

 

Recommended Alternative Transportation

A Service Rental Vehicle (SRC) should be provided to customers who do not feel safe operating their vehicle until the open recall has been completed. In addition, a SRC may be required based on the recall repair procedure duration and any other additional work on the vehicle that may need to be addressed during customer’s visit.  If a SRC is not available, other options such as a 3rd Party Rental or Rideshare may be provided.

 

Parts Information

There are no parts required for this recall campaign’s service procedure.

 

Sample Customer Talk Tracks

  1. “We will update your vehicle’s Motor Control Unit. Potentially, the vehicle’s speed could temporarily, slowly increase after release of the brake pedal. This recall service procedure will be performed at no cost to you. Please note that your vehicle’s brake operation is not affected and will remain fully operational. If necessary, we would like to offer you an SRC while we perform this recall and any other related work that your vehicle may require. We apologize for the severe inconvenience. “
  2. “As a courtesy, I checked your vehicle for any open service campaigns or recalls and found that your vehicle has an open recall related to the Motor Control Unit. The recall addresses a potential condition where the vehicle’s speed could temporarily, gradually increase after release of the brake pedal. We will provide a software update to address this situation at no cost to you. Please note that the vehicle’s brake operation is not affected and will remain fully operational.”

 

Customer FAQ

Q1: What is the issue?

A1: The motor control unit (“MCU”) software may detect a transmission / drive motor synchronization fault while driving which can trigger a “fail-safe” condition that temporarily results in slow, unintended acceleration after release of the brake pedal.  Service brake functionality is unaffected and remains fully operational.

 

Q2: What are the affected vehicles?

A2: Certain 2021-23MY Elantra Hybrid (CN7 HEV) equipped with 1.6L GDI engines produced 12/15/2020 – 07/29/2023

 

Q3: What is the safety concern?

A3: Unintended acceleration could increase the risk of a crash.

 

Q4: Have there been any accidents or injuries?

A4: As of the date of this filing (08/18/23), there are no related crashes, injuries, fires, or reported incidents in the U.S and Canada.

 

Q5: Will a Dealer Stop Sale or Port Hold be issued?

A5: Dealer: A dealer “stop sale” has been issued in accordance with federal regulation for affected vehicles unsold at dealers.

Port: A port hold has been placed for affected vehicles at the ports/vehicle processing centers.

 

Q6: What will be done during the recall service at the dealer?

A6: Owners can continue driving these vehicles as the vehicle’s brake systems are fully operational and effective in slowing the vehicle.  As an added level of protection, all affected vehicles are equipped with brake override systems as a standard feature.

All owners of the subject vehicles will be notified by first class mail with instructions to bring their vehicles to a Hyundai dealer to update the logic in the Motor Control Unit (“MCU”).   This remedy will be offered at no cost to owners for all affected vehicles, regardless of whether the affected vehicles are still covered under Hyundai’s New Vehicle Limited Warranty.   Additionally, Hyundai will provide owners of affected vehicles reimbursement for out-of-pocket expenses incurred to obtain a remedy for the recall condition in accordance with the reimbursement plan submitted to NHTSA on February 24, 2022.

 

Q7: When will owners be notified?

A7: Owners of the subject vehicles will be notified via First Class mail in mid-October 2023.

 


23-01-070H
AUGUST 2023

MOTOR CONTROL UNIT (MCU) SOFTWARE UPDATE (RECALL CAMPAIGN 248)

 

IMPORTANT

Vehicle repairs related to safety recalls are critically important and must be performed properly in accordance with TSB procedures. Review this bulletin in its entirety prior to beginning any repair work.

As required by federal law, dealers must not deliver new vehicles for sale or for lease to customers until all open recalls have been performed. Dealers must also perform all open recalls on used vehicles, demo, and rental vehicles prior to placing them into customer use and whenever an affected vehicle is in the shop for any maintenance or repair.

 

Description: This bulletin provides information related to a Motor Control Unit (MCU) software update for Elantra Hybrid (CN7 HEV) vehicles. The MCU software may detect a transmission / drive motor synchronization fault triggering a “fail-safe” condition that temporarily results in slow, unintended acceleration following brake pedal release while driving. Brake operation is not affected and remains fully operational and effective to slow the vehicle. Unintended acceleration could increase the risk of a crash.

 

Applicable Vehicles:

  • 2021-2023MY Elantra Hybrid (CN7 HEV) equipped with 1.6L GDI engine produced 12/15/2020-07/29/2023

 

GDS Information:

System Selection: MCU

*Event # Description
1025 CN7 HEV WARNING LIGHTS AND SLOW ACCELERATION IMPROVING UPGRADE

* or use a later available event as listed in the GDS update screen, if one is available.

 

MCU Update and ROM Information Table:

EVENT MODEL ENGINE MCU P/N ROM ID
OLD  NEW
#1025 Elantra Hybrid (CN7 HEV) Gamma 1.6 GDI 36600-2BBB0

36600-2BBB1

GCNDH21ABMS0-000 GCNDH23NBMS1-000

 

Information

You must initially perform GDS MCU Updates #1025 in Auto Mode.

If the MCU Update starts but then fails in Auto Mode, perform the update in Manual Mode to recover.

 

Information

1.Verify the vehicle battery has reasonable charge.

2.Turn off all lamps (Do not leave head lamp switch in auto mode.), and all accessories.

3.Perform update with the ignition switch in the ON position.

4.Do not disconnect any cables connected to the vehicle or scan tool during update.

5.Do not start the engine during update.

6.Do not turn off the ignition switch during update.

 

NOTICE

GDS-M Vehicle Battery Low Voltage Warning:

When the vehicle battery is lower than 12 volts, the GDS-M will trigger a Low Battery Voltage Warning. If this Warning occurs,

A. Connect the battery to a fully charged battery jump pack or GR8 charger using “Power Supply Mode” to continue the software update.

OR

B. Select “BACK” to exit the SW update. Then, start the engine and idle with the headlights on for 20 minutes. Return to the SW update after charging the battery.

 

Failure to do either one of these steps can cause the vehicle battery to die during the update, causing the vehicle to become inoperable.

 

Manual Update: If the MCU Update starts but then fails in auto mode, perform the update in Manual Mode to recover

 

*Event # Description Password
1025 CN7 HEV WARNING LIGHTS AND SLOW ACCELERATION IMPROVING UPGRADE 3660

 


RECALL 248 ATTACHMENT A
CHRONOLOGY OF EVENTS LEADING UP TO DEFECT DECISION

August 2022 – January 2023
On August 1, 2022, NASO’s Data Analysis (“DA”) team received a Vehicle Owner Questionnaire (“VOQ”) alleging unintended acceleration while operating a model year 2022 Elantra vehicle in the U.S. No complaint or notice of the incident was made to HMA prior to receipt of the VOQ. DA opened a preliminary case for investigation and monitored the U.S. and Canadian markets for additional incidents.

February 2023
By February 2023, NASO’s DA was aware of eight (8) VOQ’s alleging the subject condition in the U.S. On February 14, 2023, DA decided to escalate the case to the Data Review Committee (“DRC”) for additional analysis. Upon confirming no sudden unintended acceleration events associated with known incidents of the subject condition, the DRC decided to escalate the case to the Technical Review Committee on February 22, 2023, for evaluation into root cause and field action consideration.

March – May 2023
NASO’s TRC performed a review of field data and found twenty-four (24) unconfirmed allegations of unintended acceleration involving the subject vehicles. On March 22, 2023, NASO shared an overview of its investigation into the subject condition during its monthly discussion with NHTSA’s ODI regarding Hyundai’s top safety investigations. Around this time, Hyundai’s North America Quality Center (“NAQC”) also began study of a repurchased incident vehicle aimed at replicating the alleged condition through long-drive evaluation.

On April 27, 2023, NASO shared its latest findings during its monthly discussion with NHTSA’s ODI on top safety investigations.

In May 2023, NAQC reported that it was unable to replicate the alleged condition through various test drives. On May 24, 2023, NASO updated ODI on its investigation progress during its monthly review of top safety investigations.

June – August 2023
By June 2023, all attempts made by NAQC to replicate the alleged condition was unsuccessful despite 2000 miles accumulated during various test drives. An update on the study was provided to ODI on June 28, 2023.

In July 2023, HMC informed NASO of testing results confirming gradual, unintended acceleration after release of the brake pedal when the vehicle transitions into EV mode during vehicle operation. According to HMC, the condition is a result of a “fail-safe” condition that is activated upon detection of a transmission/drive motor synchronization fault by the Hybrid Power Control Unit’s (“HPCU”) motor control unit. HMC was unable to duplicate unintended acceleration resulting in high vehicle speed. Additionally, the vehicle’s service brakes and brake override systems are unaffected and remain fully operational. HMC’s findings were shared with the agency during its monthly discussion with ODI on July 26, 2023.

From July 29, 2023 through August 8, 2023, NASO met with ODI on multiple occasions to discuss Hyundai’s investigation progress and recommended path forward. Based on the results of these meetings, and out of abundance of caution, NASO convened its North America Safety Decision Authority and decided to conduct a safety recall of all affected vehicles in the U.S. despite no confirmed incidents of unintended acceleration.

❖ As of the date of this filing, Hyundai has received twenty-four (24) reports dated from October 5, 2021 through June 16, 2023 alleging unintended acceleration in the subject vehicles. There are no confirmed crashes, fires, or injuries related to the subject defect condition in the U.S.

 


3 Affected Products

Vehicle

MAKE MODEL YEAR
HYUNDAI ELANTRA HEV 2021-2023

 


3 Associated Documents

ATTACHMENT A – Chronology Report

RMISC-23V589-6547.pdf 105.874KB

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Defect Notice 573 Report

RCLRPT-23V589-6822.PDF 213.821KB

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Recall Acknowledgement

RCAK-23V589-7019.pdf 645.206KB

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Latest Recalls Documents

For the Latest and Most Recent Recalls Information Visit the link below…

https://www-odi.nhtsa.dot.gov/acms/cs/documentList.xhtml?docId=23V589&docType=RCL

 


 

Hyundai Reprogramming

J2534 Diagnostic & Reprogramming - Hyundai

 

J2534 Reprogramming Software:

The Hyundai Motor America (HMA) J2534 reprogramming software allows for a common method of communication between aPC and a vehicle electronic control unit (ECU). U.S. EPA and CARB regulations mandate that all 2004 and later vehicle powertrain ECUs support emission-related reprogramming.

 

Vehicle Communication Interfaces (VCI)

The Hyundai J2534 Reprogramming and Diagnostic Tool software supports a SAE J2534-1/2 compliant passthru VCI device for use on Hyundai vehicles sold in the US. The devices, firmware, and application programming interfaces listed below have been tested by HMA and under no circumstances do we recommend the use of a non-approved J2534 device. HMA has worked closely with the following J2534 device manufacturers to ensure the hardware and software comply with all J2534-1/2 specifications.

 

Recall 248 - Software Error May Cause Unintended Acceleration - 2021-2023 Hyundai Elantra HEV | small light CarDAQ-Plus 3 All Makes J2534 Reprogramming Tool
Recall 248 - Software Error May Cause Unintended Acceleration - 2021-2023 Hyundai Elantra HEV | small light CarDAQ-Plus
Recall 248 - Software Error May Cause Unintended Acceleration - 2021-2023 Hyundai Elantra HEV | small light CarDAQ-M
Recall 248 - Software Error May Cause Unintended Acceleration - 2021-2023 Hyundai Elantra HEV | small light SuperGoose-Plus J2534 OEM Vehicle Interface
Recall 248 - Software Error May Cause Unintended Acceleration - 2021-2023 Hyundai Elantra HEV | small light Bosch Automotive Tools MTECH2 Mastertech II J2534 VCI with Wired/Wireless Capability for OEM Reprogramming and Diagnostics on GM, Ford, FCA, Nissan/Infiniti, Honda/Acura, and Toyota/Lexus Vehicles
Recall 248 - Software Error May Cause Unintended Acceleration - 2021-2023 Hyundai Elantra HEV | small light RAP2 OEM J2534 Remote Reprogramming Tool
Recall 248 - Software Error May Cause Unintended Acceleration - 2021-2023 Hyundai Elantra HEV | small light BOSCH Automotive Tools MTECH2 Mastertech II J2534 VCI
Recall 248 - Software Error May Cause Unintended Acceleration - 2021-2023 Hyundai Elantra HEV | small light Autel MaxiFlash VCI Vehicle Communication Interface J2534 PassThru ECU Programming Device Bluetooth Connection Internet Update Support CAN FD, 4 CAN Channels, DoIP, D-PDU Works with PC or Autel MS909
Recall 248 - Software Error May Cause Unintended Acceleration - 2021-2023 Hyundai Elantra HEV | small light GODIAG J2534

 

https://www.hyundaitechinfo.com/external/j2534_diagnostics_and_programming.aspx

 

www.hyundaitechinfo.com

 


 

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