In April 2026 a 2024 Cadillac Lyriq crept into a garage at low speed and struck the wall, even though the car had already received General Motors’ 2024 braking software update. A GM technical expert filed an internal safety report on April 10, and that report set a second recall in motion. GM filed it with NHTSA on Oct. 29 as campaign 26V717, covering 67,380 vehicles in the U.S.
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The fault is a short, sudden loss of hydraulic brake pressure at crawling speed, and the brakes work again once the driver presses the pedal a second time.
The performance all-wheel-drive versions in the recall
GM’s Part 573 report ties the defect to vehicles with performance all-wheel drive, coded RPO X0E. Jalopnik quotes the report as calling the condition unique to certain vehicles equipped with that system. Auto123 lists the recalled lines as the 2023-2027 Cadillac Lyriq, 2024-2027 Chevrolet Blazer EV in its SS and police PPV trims, 2025-2026 Cadillac Celestiq and 2026-2027 Cadillac Vistiq, and reports a combined 76,496 vehicles once Canada’s 9,116 are added to the U.S. count.
The filing’s table is lopsided. Lyriqs make up 44,585 of the U.S. total, Vistiqs 18,802, Blazer EVs 3,911 and Celestiqs just 82, split 51 and 31 between the 2025 and 2026 model years. The report says performance all-wheel drive is offered on Blazer EVs only in the SS and PPV trims, so the bulk of Blazer EVs on the road sit outside the action.
A slip calculation that misreads a bump in a tight turn
According to GM’s filing with NHTSA, the brake system control module software may not interpret wheel movement correctly after one particular sequence: light braking at low speed in a sharp turn, followed by a bump or depression such as the lip at the end of a driveway. The brakes momentarily release and reapply, and in that gap braking is lost. Auto123 gives the everyday example of a driver turning across a curb into a garage.
The root cause the report gives is the software’s slip calculation. The affected software part numbers include 85790899 and 86404385. NHTSA’s acknowledgment letter to GM, dated Nov. 3, describes the same thing in plain terms: a software defect that may cause a loss of braking during certain driving conditions.
24 complaints, 20 minor crashes and a repeat of the 2024 fix
GM counted 24 field complaints between Feb. 28, 2024, and June 11, 2026. Twenty involved minor accidents and two alleged minor injuries. The earlier Lyriq action, recall 24V589 of August 2024, covered 21,469 all-wheel-drive Lyriqs for an overly sensitive anti-lock braking response, and GM reported no known injuries or fatalities at the time. The April 10 garage strike showed that a car with that earlier update could still lose pressure in the new scenario.
GM opened a new product investigation on Aug. 18, and its Safety Field Action Decision Authority decided on Oct. 22 to recall. The Truth About Cars reports that GM says the current update addresses both the new fault and the 2024 one. GM engineers later reproduced the failure in track testing, according to Auto123.
Build windows show how long the exposure has run. The filing lists 2026 Vistiqs built from Nov. 12, 2024, to April 9, 2026 (13,627 vehicles) and 2027 Vistiqs built from Jan. 16 to Oct. 21, 2026 (5,175). Lyriqs run from the December 2022 start of production through July 2026, and the 2026 model-year Lyriq alone accounts for 9,322 vehicles. GM’s estimate in this filing is that all 67,380 vehicles carry the defect, a far higher share than the 1 percent it assumed in 2024.
The 2024 campaign had its own paper trail. GM received a field complaint without an accident on Oct. 14, 2023, then reports of minor crashes on Feb. 15 and March 12, 2024, opened an investigation on May 31 and decided on a recall Aug. 1, filing Aug. 8 with owner notices planned for Sept. 23, 2024. Under warranty, GM offered no reimbursement for that fix, whereas the 2026 report carries a general reimbursement plan.
A free software update and a Dec. 14 mailing
The remedy is a free update of the brake control module software, delivered over the air to owners who have accepted the terms or installed at a dealer. Auto123 adds that newly built vehicles already carry the corrected software, and that VINs became searchable on NHTSA.gov on Oct. 29. Cadillac customer service takes calls at 1-800-333-4223 and Chevrolet at 1-800-222-1020. A CarPro weekly recall roundup gives GM’s recall number as N262570900 and lists the Dec. 14 owner mailing.
One group is waiting longer. Auto123 reports that the update code for 2023 and 2024 Lyriqs is still under development, and the filing gives those model years no separate availability date. No GM spokesperson is named in the records, and GM’s report refers only to a technical expert and its decision authority.
This article was produced with the assistance of AI and reviewed by Morning Overview editors prior to publication.
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