Recall 215 – Unintended Acceleration after Gas Pedal Release – 2017-2019 Hyundai Ioniq

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December 7, 2021 NHTSA CAMPAIGN NUMBER: 21V944000

Unintended Acceleration after Gas Pedal Release

Unexpected acceleration following gas pedal release can increase the risk of a crash.

 

NHTSA Campaign Number: 21V944

Manufacturer Hyundai Motor America

Components ELECTRICAL SYSTEM

Potential Number of Units Affected 2,679

 

Summary

Hyundai Motor America (Hyundai) is recalling certain 2017-2019 Ioniq electric vehicles. An unstable electrical ground may cause the vehicle to enter a fail-safe mode with reduced acceleration and power. In certain conditions while in fail-safe mode, the vehicle may accelerate after the gas pedal is released.

 

Remedy

Dealers will update the EPCU (Electric Power Control Unit) software and repair the ground wiring, free of charge. Owner notification letters were mailed February 9, 2022. Owners may contact Hyundai customer service at 1-855-371-9460. Hyundai’s number for this recall is 215.

 

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

 


BRAKE MASTER CYLINDER REPLACEMENT (RECALL 213)

Description: This bulletin describes the procedure to replace the brake master cylinder on certain 21MY Accent (HC) models. The brake master cylinder in the subject vehicles may have been produced with sharp edges on one of the master cylinder’s secondary inner cup seal seats, resulting in premature wear of the inner cup seal. Worn inner cup seals could reduce hydraulic pressure applied by the master cylinder resulting in reduced braking function at the wheels. The driver may experience longer brake pedal travel, change in pedal feel, and extended stopping distance, increasing the risk of a crash.

Applicable Vehicles:
Certain 2021 MY Accent (HC) produced between September 29, 2020 and July 01, 2021.

 

Parts Information:

PART NUMBER PART DESCRIPTION REMARKS
58510-H9260QQH Brake Master Cylinder, Reservoir Assembly
00232-19053 DOT 4 Brake Fluid (12 FL.OZ., 355ML) Requires approximately 2 ¼ bottles (27 FL.OZ.) of brake fluid per vehicle

 

Service Procedure:

1. Record the customer’s radio presets.

2. Remove Air Cleaner Assembly, Battery, and Engine Control Module.
Refer to the applicable sections of the shop manual for removal and reinstallation.

3. Remove the brake fluid from the master cylinder reservoir.

4. Disconnect the brake fluid level switch connector (A) and disconnect the brake tube (B) from the master cylinder by loosening the tube flare nut.

Brake Tube Flare Nut Torque

lb-ft 9.4-12.3
kgf.m 1.3-1.7
N.m 13.7-16.7

5. Remove the master cylinder and reservoir assembly from the brake booster after loosening the mounting nuts (C).

Master Cylinder Mounting Nut Torque

lb-ft 9.4-12.3
kgf.m 1.3-1.7
N.m 12.7-16.7

6. Reinstall the removed parts in reverse order of removal.

7. Fill the master cylinder reservoir to the MAX (upper) level line.

8. Continue with the brake bleeding procedures below.

CAUTION

  • Do not reuse drained fluid.
  • Always use genuine DOT4 brake fluid. Using non-genuine DOT4 brake fluid can cause corrosion and decrease the life of the brake system.
  • Verify dirt or other foreign matter does not contaminate the brake fluid.
  • Do not spill brake fluid onto the vehicle. This may lead to paint damage. If brake fluid contacts any paint surface, wash the surface off immediately with water.
  • The reservoir on the master cylinder must be at the MAX (upper) level mark at the start of bleeding procedure and checked after bleeding each brake caliper. Add fluid as required.

 

Brake Bleeding Procedure:

1. After reassembly, bleed the brake system.

2. Start with the rear right brake. Attach the clear hose to the brake bleed screw.
Have an assistant slowly pump the brake pedal several times and then fully hold the brake pedal down.
While the brake pedal is held down, open the brake bleed screw for a couple of seconds, then tighten the bleed screw.

3. Repeat two to three times until air bubbles are no longer present in the tube.

Brake Bleed Screw Tightening Torque

lb-ft 5.1-9.4
kgf.m 0.7-1.3
N.m 6.9-12.7

4. Always maintain proper brake fluid level in the reservoir.
After completing the procedure at the rear right position, repeat the procedure in the sequence shown until air bubbles no longer appear in the fluid.

5. Refill the master cylinder reservoir to the MAX (upper) level line.

6. Connect the GDS-M to the vehicle, and then select ‘HCU Air Bleeding Mode’.
System ⇒ ABS/ESP ⇒ HCU Air Bleeding Mode

7. Return to the rear right caliper. Attach the clear hose to the brake bleed screw.
Inform the assistant to select the rear right button to activate the HECU.
Once the HECU has activated, the assistant should press and release the brake pedal repeatedly at regular intervals.
When the activation stops, the assistant should hold the brake pedal down.
Open the brake bleed screw for a couple of seconds, then tighten the bleed screw.
The HECU will activate again. Follow the procedure above.

NOTICE

Disregard the bleeding sequence as noted in the GDS-M. Please follow the sequence in this TSB.

8. Always maintain proper brake fluid level in the reservoir.
After completing the procedure at the rear right position, repeat the procedure in the sequence shown until air bubbles no longer appear in the fluid.

9. Refill the master cylinder reservoir to the MAX (upper) level line.

10. Restore the customer’s radio presets, check that the brakes are operating properly, and clear any DTC.

11. The service procedure is now complete.

 


Customer FAQ

 

Q1: What is the issue?

A1: During operation, the subject vehicles may enter a “fail-safe” mode causing the EV Ready lamp to flash, accompanied with reduced acceleration and overall power output. In rare instances, while in this “fail-safe” mode, a slow, unintended acceleration event can occur following full accelerator pedal release, if, a specific set of sequences are met. The braking and steering systems are fully functional during the “fail-safe” mode.

 

Q2: What is the safety concern?

A2: The unexpected continuation of acceleration following accelerator pedal release may increase the risk of a crash.

 

Q3: What will be done during the recall service at the dealer?

A3: All owners of the subject vehicles will be notified by first class mail with instructions to bring their vehicles to a Hyundai dealer to have cable kit installed and the EPCU (Electric Power Control Unit) software updated.

 


Chronology :

June – October 2021
On June 8, 2021, HMC became aware of a Korean media report regarding an incident alleging unintended acceleration on a vehicle in the Korean domestic market. HMC conducted a joint investigation with MOLIT and KATRI and collected data from the incident vehicle. Analysis of the vehicle data indicated that an unstable electrical ground may have caused instantaneous electrical noise to flow abnormally triggering a “fail-safe” mode designed to prevent impact during driving by restricting vehicle speed. The onset of the “fail-safe” mode could result in operators experiencing an acceleration delay when operating the accelerator pedal and, in limited instances, slow vehicle acceleration after full release of accelerator pedal. Noting difficulty in replicating the subject condition under normal driving conditions, HMC focused its investigation on duplicating the condition while providing regular updates to MOLIT and KATRI on its findings.
November

On November 11, 2021, HMC shared its investigation findings and discussion with MOLIT with HMA NASO.
HMA NASO conducted their own review through field claim analysis and vehicle testing.

On November 25, 2021, HMC decided to conduct a safety recall in the Korean domestic market noting the possibility of slow vehicle acceleration when the accelerator pedal is released. HMC informed NASO of its decision on the same day.

Based on the information received, NASO convened its North America Safety Decision Authority on November 30, 2021 and decided to file a safety recall notice for the affected vehicles in the U.S. market.

Regarding field claim counts from all available data sources at the time of the filing, Hyundai is not aware of any confirmed cases. Hyundai is not aware of any crashes, fires, or injuries related to the defect condition.

 


3 Affected Products

Vehicle

MAKE MODEL YEAR
HYUNDAI IONIQ ELECTRIC 2017-2019

 


9 Associated Documents

Defect Notice 573 Report

RCLRPT-21V944-3861.PDF 214.799KB

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Recall Acknowledgement

RCAK-21V944-5315.pdf 645.615KB

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Manufacturer Notices(to Dealers,etc) – Recall 215: Accelerator System – Dealer Best Practice- Remedy Not Available: December 13, 2021

RCMN-21V944-7394.pdf 277.912KB

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Manufacturer Notices(to Dealers,etc) – January 27, 2022

RCMN-21V944-8789.pdf 459.217KB

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Remedy Instructions and TSB

RCRIT-21V944-0070.pdf 1170.608KB

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Manufacturer Notices(to Dealers,etc) – January 18, 2022

RCMN-21V944-2517.pdf 392.352KB

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ISSUED Owner Notification Letter(Part 577)

RCONL-21V944-4481.pdf 175.541KB

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Recall Quarterly Report #2, 2022-2

RCLQRT-21V944-9145.PDF 211.241KB

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Recall Quarterly Report #3, 2022-3

RCLQRT-21V944-0814.PDF 211.319KB

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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=21V944&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 215 - Unintended Acceleration after Gas Pedal Release - 2017-2019 Hyundai Ioniq | small light CarDAQ-Plus 3 All Makes J2534 Reprogramming Tool
Recall 215 - Unintended Acceleration after Gas Pedal Release - 2017-2019 Hyundai Ioniq | small light CarDAQ-Plus
Recall 215 - Unintended Acceleration after Gas Pedal Release - 2017-2019 Hyundai Ioniq | small light CarDAQ-M
Recall 215 - Unintended Acceleration after Gas Pedal Release - 2017-2019 Hyundai Ioniq | small light SuperGoose-Plus J2534 OEM Vehicle Interface
Recall 215 - Unintended Acceleration after Gas Pedal Release - 2017-2019 Hyundai Ioniq | 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 215 - Unintended Acceleration after Gas Pedal Release - 2017-2019 Hyundai Ioniq | small light RAP2 OEM J2534 Remote Reprogramming Tool
Recall 215 - Unintended Acceleration after Gas Pedal Release - 2017-2019 Hyundai Ioniq | small light BOSCH Automotive Tools MTECH2 Mastertech II J2534 VCI
Recall 215 - Unintended Acceleration after Gas Pedal Release - 2017-2019 Hyundai Ioniq | 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 215 - Unintended Acceleration after Gas Pedal Release - 2017-2019 Hyundai Ioniq | small light GODIAG J2534

 

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

 

www.hyundaitechinfo.com

 


 

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Last update on 2024-03-18 / Affiliate links / Images from Amazon Product Advertising API

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