July 29, 2021 NHTSA CAMPAIGN NUMBER: 21V579000
Overall braking performance may be compromised, increasing the risk of a crash.
NHTSA Campaign Number: 21V579
Manufacturer General Motors, LLC
Components SERVICE BRAKES, HYDRAULIC
Potential Number of Units Affected 2
General Motors, LLC (GM) is recalling certain 2021 Chevrolet Tahoe and GMC Yukon vehicles. Dealer service technicians may have calibrated the brake system incorrectly, affecting Electronic Stability Control (ESC) , traction control, Anti-Lock Brake System (ABS), and braking while towing a trailer.
Dealers will recalibrate the brake system control module, free of charge. Owner notification letters were mailed on August 27, 2021. Owners may contact Chevrolet customer service at 1-800-222-1202; GMC customer service at 1-800-462-8782. GM’s number for this recall is N212340970.
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.
General Motors has decided that a defect which relates to motor vehicle safety exists in one 2021 model year Chevrolet Tahoe and one 2021 model year GMC Yukon. Dealer service technicians may have programmed these vehicles’ brake system control modules (BSCM) with incorrect calibrations. This condition may adversely impact the operation or sensitivity of certain vehicle systems, including electronic stability control, traction control, and anti-lock braking, or cause the loss of trailer braking while towing. Stability control, traction control, and anti-lock braking may not perform as intended in certain low traction conditions. Braking performance will be reduced when towing a trailer equipped with trailer brakes. There may be increased risk of a crash.
No parts are required for this repair.
Frequently Asked Questions (FAQs) for Safety Recall N212340970
Incorrect Software Calibration May Affect Certain Driving Assist Features
These questions and answers are being provided to help GM dealers respond to inquiries from involved vehicle owners about the Safety recall identified above.
Q1) Which vehicles are involved?
Q2) What is the issue or condition?
Dealer service technicians may have programmed these vehicles’ brake system control modules (BSCM) with incorrect calibrations. This condition may adversely impact the operation or sensitivity of certain vehicle systems, including electronic stability control, traction control, and anti-lock braking, or cause the loss of trailer braking while towing.
Q3) What symptoms may be experienced? What warning signs may be associated with the issue or condition described?
Stability control, traction control, and anti-lock braking may not perform as intended in certain low traction conditions. Braking performance will be reduced when towing a trailer equipped with trailer brakes.
Q4) What is the remedy/repair?
Q5) What is the safety risk? Is the vehicle safe to drive?
Stability control, traction control, and anti-lock braking may not perform as intended in certain low traction conditions. Braking performance will be reduced when towing a trailer equipped with trailer brakes. There may be increased risk of a crash.
Q6) Does the customer have to pay for this remedy/repair?
No, this repair will be done at no cost to the customer.
Q7) Is the remedy/repair available now?
Yes please see the attached bulletin for details.
Q8) What should customers do until recall repairs can be completed? Are there any special instructions?
If special instructions are provided, they will be included in the notification letters to customers.
Q9) How can customers check to see if their vehicle is involved in this field action?
Customers who own a vehicle involved in the field action will be notified by mail by General Motors, but they may also check their Vehicle Identification Number (VIN) for field actions in GM Owner Center at https://my.gm.com/recalls or via NHTSA’s website at https://vinrcl.safercar.gov/vin/.
Q10) If customers are concerned, can they get a rental car or courtesy transportation?
Courtesy transportation is available for customers whose vehicles are involved in this recall and are within the warranty coverage period for the warranty which is associated with this recall. Please refer to Warranty Administration Bulletin #17-NA-073: Field Action Courtesy Transportation Policy for further information.
2 Affected Products
11 Associated Documents
Defect Notice 573 ReportRCLRPT-21V579-4772
Manufacturer Notices(to Dealers,etc) – Dealer Message re N212340970 – Safety Recall Incorrect Software Calibrations May Affect Certain Driving Assist FeaturesRCMN-21V579-9940
Miscellaneous Document – Frequently Asked Questions (FAQs) for Safety Recall N212340970 Incorrect Software Calibration May Affect Certain Driving Assist FeaturesRMISC-21V579-7760
Safety Bulletin – Product Safety Recall N212340970 Incorrect Software Calibrations May Affect Certain Driving Assist Features
Recall Quarterly Report #1, 2021-3RCLQRT-21V579-0759
Recall Quarterly Report #2, 2021-4RCLQRT-21V579-0922
Manufacturer Notices(to Dealers,etc) – Dealer Message re REVISION N212340970 01 Safety Recall Incorrect Software Calibrations May Affect Certain Driving Assist Features Customer Letter AddedRCMN-21V579-8043
Safety Bulletin – Safety Bulletin re Product Safety Recall N212340970 Incorrect Software Calibrations May Affect Certain Driving Assist FeaturesRCSB-21V579-6204
Miscellaneous Document – Frequently Asked Questions (FAQs) for Safety Recall N212340970 Incorrect Software Calibration May Affect Certain Driving Assist FeaturesRMISC-21V579-5766
ISSUED Owner Notification Letter(Part 577)RCONL-21V579-0379
Latest Recalls Documents
To obtain the latest electronic controller calibration information for your vehicle, go to https://tis2web.service.gm.com/tis2web and enter the vehicle’s 17 character Vehicle Identification Number (VIN) and select ‘Get CAL ID’.
You can then compare the latest part number with the actual number installed on the vehicle to determine if a reprogram is needed.
The Service Programming System (SPS) application is part of the TIS2Web system. To program an ECU, the SPS application must communicate with the vehicle control modules using the proper J2534 programming interface tool.
The following are the supported interface tools:
The Tech 2 supports model years 1996 and beyond. With the addition of the CAN Diagnostic Interface (CANdi) module, Tech 2 is fully backward compatible with current Tech 2 functionality and operates transparently when diagnosing non-CAN-equipped vehicles.
Servicing the next generation Global A vehicles will require the diagnostic software, GDS2, Global Diagnostic System 2 running on a local PC device while the MDI is connected to the vehicle. The GM MDI is the Global Diagnostic tool for future vehicles starting with Global A vehicles.
The GM MDI was introduced in the fall of 2007 for Pass-Thru programming and offers faster programming speed. It can be used to perform Pass-Thru programming on all vehicles built since 1996 and into the future. Click here to view a list of GDS supported vehicles.
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