The year the numbers collapse: 86 complaints against 212 the year before and 452 in 2018. Three recalls, one of which only applies to wheelchair conversions. The nine-speed shudder is still in the file, just much quieter.

The 9T65 nine-speed automatic still produces the same complaint it did on 2018, just far less often. 'The car sometimes will not accelerate in the 25-35 mph range and will begin to shudder and shake. This can be very dangerous when attempting to m[erge].' 'I AM HAVING A LOT OF TRANSMISSION SHUDDER ESPECIALLY WHEN ACCELERATING. NOTICED THAT CONSUMER REPORTS STATED IN THEIR MAGAZINE THAT THIS HAS BEEN [an issue].' 'I was driving and without any type of warning the car stopped shifting so I was barely touching the gas but my tac was all the way up.' And the one with a number attached: 'Car was late shifting into gear. Taken to dealership and replaced tourque cpnverters for 3800. Car gets fluids checked 4,000 miles later transmi[ssion].' GM's paperwork for this year is a service bulletin covering 2019 to 2024 providing 'a procedure to correct a customer concern of Shudders or Shakes at Low Speeds,' preceded by Preliminary Information telling technicians to 'perform a transmission fluid drain and fill to correct a TCC shudder concern.' TCC is the torque converter clutch, the part that locks the engine directly to the gearbox at cruising speed. Behind all of it is GM's internal 9T65 Automatic Transmission Replacement Pilot Program bulletin, republished across 2018 to 2024, which is a dealer process document and pays for nothing. No recall covers this. A test drive at 25 to 40 mph under light throttle is the whole diagnostic.

The dash reads Shift to Park while the car is already in park, and the engine will not switch off. 'Shift to park message comes on 50% of the time when shutting down the engine. Tapping the shift lever forward sometimes removes the message, oth[er times not].' 'Shift to park warning comes on every time I put my car into park. I can give the gear shift a hard tap so it can go into park and my car will tur[n off].' 'I own a 2021 Chevy Traverse and h[ave a] persistent Shift to Park message when vehicle is in Park.' The awkward part is that GM published thirteen bulletins about this message and every single one stops at model year 2019, so a 2021 owner is reporting a condition the manufacturer's own service literature does not acknowledge on their car. What that means practically is no documented procedure and no goodwill lever. The useful part comes from two mechanics who diagnose it on video: it is the shifter assembly and its park position sensor, not the transmission. One scans a car and reports 'no fault in the engine, no fault in the transmission,' then opens the steering column trim and points at the sensor. The other simply replaces the shifter assembly. If a shop starts talking about the gearbox for a Shift to Park message, get a second opinion.

New in 2021 and not visible on the earlier years: repeated alternator failures, often taking batteries with them. 'Alternator fail before 60,000 miles. Had the car almost 3 years and children in it. Apparently a known common issue yet no recall.' 'MY ALTERNATOR WENT OUT AT 40K MILES, IT WAS REPLACED AND NOW WENT OUT AGAIN AT 75K. I HAVE GONE THRU 7 BATTERIES SINCE I BOUGHT THE CAR BRAND NEW.' Other electrical reports in the same file point the same direction: a car that 'inadvertently lost motive power and stal[led]' while driving at 20 mph, radios that go blank and will not reset, and a check engine light paired with a cooling fan that runs on for minutes after shutdown. No recall or GM programme in our data covers the alternator on this year. It is a repair rather than a catastrophe, but a car on its second alternator and its seventh battery is telling you something, and a charging-system test is a five-minute check any shop can do before you buy.

Recall 21V-472 (GM number N212340220) is unusual in that the defect was introduced by the dealer network rather than the factory: on certain 2021 Traverse and Buick Enclave vehicles, 'during service by dealers, certain vehicles may have received incorrect air bag calibration software that may affect frontal airbag deployment.' Dealers update the calibration free; letters went out 29 July 2021. Recall 22V-210 (GM number N212352140) covers 2020 to 2022 Traverses and 2021 to 2022 Enclaves: 'the harness connector to the left or right side roof rail air bag may have incompatible electrical terminals, which could prevent the air bags from deploying in a crash.' Dealers replace the connector free; letters went out 29 April 2022. The third, recall 21V-817, is filed by Braun Corporation rather than General Motors and covers only 2020 and 2021 Traverses converted to wheelchair-accessible spec with the Power In-floor Ramp, where 'the screw and clip that hold the inner wheel-well plastic shroud in place may chafe against the transmission case, possibly resulting in a transmission fluid leak.' If your Traverse is not a Braun conversion, that campaign does not apply to it; it is counted here only because NHTSA counts it against the model year.

Worth stating plainly, because the earlier years of this generation are genuinely rough and the 2021 is not. The complaint total falls from 452 on the 2018 to 212 on the 2020 to 86 here, a drop of more than 80 percent from the peak. The dense clusters that make 2018 and 2019 hard to recommend, dozens of transmission replacements and a wall of Shift to Park reports, are down to single filings. The tire, fuel pump and roof-rail-inflator recalls that piled up on 2020 do not reach this year. There is no engine programme on this year comparable to the 2018 piston oil control ring Customer Support Program, whose remedy was a new engine. And the one problem that does recur, the exhaust bracket, is the only Traverse defect with genuinely generous free coverage behind it. What is left is a large, comfortable, ordinary three-row with a specific short list: drive it for shudder, check the charging system, listen for exhaust rattle, and confirm two free air bag campaigns.