N503 – DCDC Converter May Short Circuit – 2020 Land Rover Discovery Sport & Range Rover Evoque MHEV

November 5, 2020 NHTSA CAMPAIGN NUMBER: 20V683000

DCDC Converter May Short Circuit

An electrical short-circuit increases the risk of a fire.

 

NHTSA Campaign Number: 20V683

Manufacturer JaguareBay logo Land RovereBay logo North America, LLC

Components ELECTRICAL SYSTEM

Potential Number of Units Affected 3,048

 

Summary

JaguareBay logo Land RovereBay logo North America, LLC (Land RovereBay logo) is recalling certain 2020 Land RovereBay logo Discovery Sport and Range Rover Evoque MHEV vehicles. The 48 volt electrical system may experience an overload event, causing a failure of the Metal Oxide Semiconductor Field Effect Transistor (MOSFET) and result in a DCDC converter electrical short-circuit.

 

Remedy

Land RovereBay logo will notify owners, and dealers will update the vehicle software, free of charge. Owners are advised to exit the vehicle when it is parked and park outside away from buildings or structures until the repair is complete. The recall began December 8, 2020. Owners may contact Land RovereBay logo customer service at 1-800-369-1000. Land RovereBay logo’s number for this recall is N503.

 

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.safercar.gov.

 

Check if your Land Rover has a Recall

 


DESCRIPTION OF DEFECT

A potential issue has been identified on certain Land RovereBay logo vehicles within the listed Affected Vehicle Range where an electrical overload event in the 48-Volt electrical system may cause a failure of the Metal Oxide Semiconductor Field Effect Transistor (MOSFET).

 

AFFECTED VEHICLE RANGE

A total of 3,048 vehicles are potentially involved in the USA and Federalized Territories.

Discovery Sport
Model Year: ………….. 2020
VIN: ………………………… SALCM2GXXLH833819-SALCM2GX9LH877360

New Range Rover Evoque
Model Year: ………….. 2020
VIN: ………………………… SALZM2GX5LH000181-SALZM2GX6LH114934

Visit the British Brands Sales Suite (BBSS) website for a list of affected vehicles at your retailer.

 

EFFECT ON VEHICLE OPERATION

Failure of the MOSFET may cause an electrical cascade failure, causing the Direct Current to Direct Current (DC/DC) converter to experience an electrical short where the 12-Volt circuit shorts to ground. When the DC/DC converter experiences an electrical short to ground, the 12-Volt electrical system will discharge, indicated by the battery warning tell-tale on the Instrument Panel Cluster (IPC). In extreme cases, the vehicle occupants may notice a burning smell and/or smoke from the DC/DC converter vent in to the passenger compartment.
Where sufficient oxygen exists, a sustained vehicle fire may occur.

 

SERVICE PROGRAM / REWORK ACTION

Owners will be notified by mail and instructed to take their vehicle to an authorized Land RovereBay logo retailer to install the latest software which mitigates the electrical failure condition.
There will be no charge for this repair under this program.

 

ACTION TO BE TAKEN

Use the JaguareBay logo Land RovereBay logo claims submission system to make sure that a vehicle is eligible for this program prior to undertaking any rework action.

Retailers are required to HOLD affected new vehicles that are within your control and refrain from releasing the vehicles for new vehicle sale pending completion of the rework action. Affected vehicles already in the hands of customers should be updated at the next available opportunity. Until the affected vehicles, including those under retailer control, receive these updates, it is strongly recommended that all occupants, including pets, exit the vehicle when parked. Vehicles should be parked outdoors and away from buildings or multi-storey carparks where possible.

JaguareBay logo Land RovereBay logo North America recommends that affected sales demonstrator and loaner vehicles are repaired before use and that used vehicles are repaired before sale. Retailers who choose to proceed against this recommendation, where legally permitted, must clearly and conspicuously disclose the open recall to the applicable customers.
Refer to Technical Bulletin N503NAS, SAFETY RECALL: Software Updates, for detailed repair instructions.

 


TECHNICAL Q & A: SAFETY RECALL N503

Main Message: An electrical overload event in the 48-Volt electrical system may cause a failure of the Metal Oxide Semiconductor Failure of the MOSFET may cause an electrical cascade failure, causing the Direct Current to Direct Current (DC/DC) converter to experience an electrical short where the 12-Volt circuit shorts to ground.

Q1 Who do I contact if a member of the press contacts me about this recall?

Please ensure Press enquiries are referred to the JaguareBay logo Land RovereBay logo North America Press Office to the attention of:

Stuart Schorr
Vice President, Communications & Public Affairs
JaguareBay logo Land RovereBay logo North America, LLC
[email protected]
Office: +1-201-760-8561
Cell: +1-201-739-2964

 

Q2 Why is JaguareBay logo Land RovereBay logo recalling certain Land RovereBay logo vehicles?

Where there is a permanent 12V short to ground condition, it is possible that heat build-up may be sufficient for a burning smell and/or smoke from the DC/DC converter vent in to the passenger compartment to occur. Where sufficient oxygen exists, it may lead to a sustained vehicle fire.

 

Q3 Can you tell me more about what is wrong with the vehicles?

An electrical overload event in the 48V electrical system may cause a failure of the MOSFET. Failure of the MOSFET may cause an electrical cascade failure, causing the DC/DC converter to experience an electrical short where the 12V circuit shorts to ground. When the DC/DC converter experiences an electrical short to ground, the 12V electrical system will discharge, indicated by the battery warning lamp on the Instrument Panel Cluster (IPC).

 

Q4 How would the customer become aware of potentially having this concern?

Customer should notice the battery warning lamp illuminated on the IPC.

 

Q5 Does this concern affect vehicle safety?

Yes, we consider this an unreasonable risk to safety and have issued a voluntary safety recall for the affected vehicles.

 

Q6 Has JaguareBay logo Land RovereBay logo Limited received many complaints?

There have been a very small number of reports of this issue.

 

Q7 Have there been any accidents or injuries?

JaguareBay logo Land RovereBay logo has received a very small number of reports fires as a result of this concern.

 

Q8 How was the condition discovered?

The issue was detected through internal quality assurance checks.

 

Q9 How long has JaguareBay logo Land RovereBay logo known about this problem?

Investigations into this issue started in December 2019.

 

Q10 Is the defect leading you to any concerns regarding the reliability of a system, which is supposed to be designed and engineered for the passengers’ safety? What type of measures are you planning to take?

We have no concerns with the overall reliability of the vehicle. JaguareBay logo Land RovereBay logo carefully monitors field data to ensure that any matters relating to safety and compliance are rigorously investigated.

 

Q11 What has JaguareBay logo Land RovereBay logo done in production?

Production vehicles have the latest level of software installed.

 

Q12 What will an authorized Land RovereBay logo retailer do to the vehicles?

An authorized Land RovereBay logo retailer will update the software in the battery control systems.

 

Q13 Which vehicles are affected by this recall?

Certain 2020 model year Land RovereBay logo Discovery Sport and Range Rover Evoque Mild Hybrid Electric Vehicle (MHEV) specification vehicles produced from November 2, 2018 to October 2. 2020.

Discovery Sport: SALCM2GXXLH833819-SALCM2GX9LH877360
Range Rover Evoque: SALZM2GX5LH000181-SALZM2GX6LH114934

 

Q14 Are other JaguareBay logo Land RovereBay logo models affected by these actions?

No other models, other than those listed on this document, are known to be affected by this condition.

 

Q15 Are parts available to rework vehicles?

Yes, the necessary software is available for authorized Land RovereBay logo retailers to conduct this repair.

 

Q16 How much will the recall cost JaguareBay logo Land RovereBay logo?

Cost was not a factor in deciding to recall these vehicles.

 

Q17 How do I know if my vehicle is affected?

All owners of potentially affected vehicles will shortly receive a letter inviting them to contact an authorized Land RovereBay logo retailer for the work to be carried out.

 

Q18 How long does it take for the vehicle to be inspected and repaired?

The work will be carried out as quickly and efficiently as possible to minimize inconvenience to customers and is expected to take no longer than 30 minutes. Due to retailer schedules, vehicles may be required for longer.

 

Q19 Can I continue to drive my vehicle safely until it has been recalled?

Customers are advised to contact an authorized Land RovereBay logo retailer should they have any concerns regarding their vehicles.

 


CONDITION SUMMARY:

SITUATION:

A potential issue has been identified on certain vehicles within the listed Affected Vehicle Range where an electrical overload event in the 48-Volt electrical system may cause a failure of the Metal Oxide Semiconductor Field Effect Transistor (MOSFET).

Failure of the MOSFET may cause an electrical cascade failure, causing the Direct Current to Direct Current converter (DC/DC) to experience an electrical short where the 12-Volt circuit shorts to ground. When the DC/DC experiences an electrical short to ground, the 12-Volt electrical system will discharge, indicated by the battery warning tell-tale on the Instrument Cluster. In extreme cases, the vehicle occupants may notice a burning smell and/or smoke from the DC/DC vent into the passenger compartment.

Where sufficient oxygen exists, a sustained vehicle fire may occur.

 

ACTION:

Retailers are required to HOLD affected new vehicles that are within your control and refrain from releasing the vehicles for new vehicle sale pending completion of the procedure(s) detailed in this Technical Bulletin. Unsold vehicles should have this performed as part of the Pre-Delivery Inspection (PDI) process but must have it completed prior to vehicle handover to the customer.

Affected vehicles already in the hands of customers should be updated at the next available opportunity.

 

DIAGNOSTIC INSTRUCTION:

CAUTION:

All ignition ON/OFF requests MUST be performed; failure to do so may cause damage to vehicle control modules.

 

1.

CAUTION:

A JaguareBay logo Land RovereBay logo-approved battery support unit must be connected to the vehicle startup battery during diagnosis / module programming.

Connect the JaguareBay logo Land RovereBay logo-approved battery support unit to the vehicle startup battery.

 

2.

NOTE:

The JaguareBay logo Land RovereBay logo-approved diagnostic equipment must be loaded with PATHFINDER version 305 (or later).

Connect the JaguareBay logo Land RovereBay logo-approved diagnostic equipment to the vehicle and begin a new session.

3.

Follow all on-screen instructions.

1. Select ‘N503 – Software Updates’ from the campaigns menu.

2. Follow the on-screen instructions until the application finishes successfully.

 

4.

Only if required: set the vehicle to Transit mode.

1.  Follow the on-screen instructions until the application finishes successfully.

 

5.

Exit the current session.

 

6.

Disconnect the diagnostic equipment and battery support unit from the
vehicle.

 


573.6 (c) (6) – Chronology of Events for N503:

 

A Product Safety and Compliance Committee (PSCC) Investigation was opened on December 03, 2019, following a report of a vehicle fire at the Halewood vehicle assembly plant. The PSCC requested engineering to conduct an investigation, including vehicle testing to replicate the failure and determine the root cause and scope of the issue.

 

During the 1st half of 2020 the engineering team undertook various experiments to seek to replicate the Halewood incident using testing rigs. Engineering reported back to the PSCC through February and March and informed the committee the failure mode requires a number of unique conditions and failure was not likely during normal vehicle operation. The engineering team also informed the PSCC they were focusing their investigation into the DCDC converter.

 

In late March 2020, the PSCC requested the engineering team to replicate the issue on a vehicle in order to fully understand the issue and its effects on the vehicle. Concurrently, the PSCC requested the parts supplier to conduct a thorough investigation into the DCDC convertor issue.

 

The engineering team reported back to the PSCC in April and May 2020, where the focus of the investigation into possible causes expanded to several components of the vehicle: the MOSFET, the Battery Energy Control Module (BECM), the Powertrain Control Module (PCM), and the DCDC converter. The engineering team also informed the PSCC of the difficulty in replicating the voltage overload condition known to be required to trigger the cascade electrical failure. The PSCC instructed the engineering team to continue to investigate the possible causes of the issue.

 

The PSCC reviewed the issue during July, August and September.

 

The PSCC further reviewed the concern on October 27, 2020, where detailed explanations about the possible causes and analysis on the effects to the vehicle, the scope of the population was discussed. Assessment as to the emergence of any pattern and trend of the issue was also reviewed. Engineering confirmed that all lines of technical investigation had been exhausted, the PSCC progressed the issue to the Recall Determination Committee (RDC).

 

The RDC reviewed all information available on October 29, 2020 and concluded that the issue represented an unreasonable risk to safety and a voluntarily safety recall be conducted to download the latest software to the vehicles.

 

There have been a limited number of reports outside of the United States.

 


 


2 Affected Products

Vehicles

MAKEMODELYEAR
LAND ROVERDISCOVERY SPORT2020
LAND ROVERRANGE ROVER EVOQUE2020

 


12 Associated Documents

Manufacturer Notices(to Dealers,etc)- SAFETY RECALL N503 (NHTSA 20V-683) – SOFTWARE UPDATES

RCMN-20V683-7529.pdf 161.33KB

 


Recall 573 Report – Amendment 1

RCLRPT-20V683-4687.PDF 215.591KB

 


Recall Quarterly Report #1, 2020-4

RCLQRT-20V683-6844.PDF 211.148KB

 


Remedy Instructions and TSB

RCRIT-20V683-7747.pdf 102.806KB

 


ISSUED Owner Notification Letter(Part 577)

RCONL-20V683-2262.pdf 266.003KB

 


ISSUED Owner Notification Letter(Part 577)- Second Notification

RCONL-20V683-3745.pdf 346.449KB

 


Manufacturer Notices(to Dealers,etc)- SAFETY RECALL N503 (NHTSA 20V-683) – SOFTWARE UPDATES

RCMN-20V683-6112.pdf 207.039KB

 


Recall Quarterly Report #2, 2021-1

RCLQRT-20V683-6298.PDF 211.246KB

 


Chronology

RMISC-20V683-1966.pdf 33.579KB

 


Defect Notice 573 Report

RCLRPT-20V683-4387.PDF 215.45KB

 


Recall Acknowledgement

RCAK-20V683-1957.pdf 244.843KB

 


Recall Quarterly Report #3, 2021-2

RCLQRT-20V683-7454.PDF 211.339KB

 


Latest Recalls Documents

https://www-odi.nhtsa.dot.gov/acms/cs/documentList.xhtml?docId=20V683&docType=RCL

 


 

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