GMC Acadia 2024–2026Common problems, reliability & repair costs

Symptoms: Loud brake squeal from nearly new — owners report it starting by 2,000–6,500 miles — with dealers repeatedly inspecting and calling it normal. Separately, the dash pad-life monitor disagrees with reality in both directions: 'service brake pads' warnings with 80–92% pad left, and 22% readings on pads measuring 8 mm. Some owners were quoted pad replacement by 16,000 miles, and one NHTSA complaint reports front brake parts on backorder 'due to high volume.'

Fix: Two tangled issues. The false readings are software: GM service update N242471431 (Feb 2025) has dealers recalibrate the electronic brake control module's pad-wear estimate on 2024–2025 Acadias (plus Traverse, Enclave, and Terrain siblings) free within the warranty period. The wear and squeal are physical: pads and rotors, often both, replaced early — one owner's documented front pad-and-rotor job ran $380, and a full four-corner job at an independent shop lands toward the top of the range. Forum reporting attributes the squeal to GM's copper-free pad compound.

Sources: GM Authority — Acadia/Terrain brake control module fix (service update N242471431), NHTSA — 2024 GMC Acadia complaints (service brakes = #1 category), Acadia Forum — 2024 Acadia brake pad life, CarComplaints — 2024 GMC Acadia

Symptoms: Sudden loss of power braking: the pedal either goes hard and nearly immovable or sinks to the floor, usually with a cluster of warnings — 'Service Brake Assist,' 'Service ESC,' ABS and traction lights, sometimes 'press brake pedal hard, speed limited.' Multiple NHTSA complaints describe near-misses in traffic and failures on cars under 10,000 miles; several owners report the master cylinder replaced and weeks-long parts backorders.

Fix: Master brake cylinder replacement — attorneys investigating the defect describe a missing internal cartridge seal in the brake module. GM issued a service update in December 2024 for master-cylinder inspection/replacement on early builds of the related Traverse and Enclave, but as of this writing there is NO recall on the Acadia, and a class action (Barron v. General Motors, E.D. Pa., filed Oct 2025) alleges GM kept using the same parts in 2025 models. Nearly every affected car is still under the bumper-to-bumper warranty, so the repair itself should be free — the real costs are downtime on backordered parts and the risk of driving one that hasn't failed yet. Any brake-assist warning on a test drive is a walk-away.

Sources: ClassAction.org — GM master brake cylinder defect lawsuit (Barron v. GM), McCune Law Group — 2024–2025 Traverse, Acadia, Enclave braking-system investigation, Lemberg Law — 2025 GMC Acadia complaint data (service brakes = 36 of 59 complaints), NHTSA — 2025 GMC Acadia complaints

Symptoms: The car brakes hard for obstacles that aren't there: reverse automatic braking slamming on while backing out of an empty driveway, forward AEB activating at low speed on open road, and adaptive cruise or Super Cruise braking heavily at highway speed for vehicles in adjacent lanes. Forward-collision-avoidance complaints are the #2 NHTSA category both years (10 in 2024, 20 in 2025). One owner reports a dealer saying GM is aware of the reverse-braking issue with no repair available; some owners simply disable the feature.

Fix: Software updates and sensor/camera recalibration at the dealer are the only remedy so far — there is no recall and no NHTSA investigation specific to this generation's AEB as of this writing. Document every event with date and conditions; repeated verified events during the warranty period are lemon-law fodder. Do not disable AEB and forget it exists on a car you're test-driving — trigger conditions (backing out of a driveway, passing on the highway) are easy to replicate.

Sources: NHTSA — 2024 GMC Acadia complaints (forward collision avoidance = #2 category), Lemberg Law — 2025 Acadia complaint breakdown (AEB 14 + warnings 9 + ACC 5)

Symptoms: Coolant loss from the plastic quick-connect fitting joining the upper radiator hose to the radiator — the seal inside degrades and seeps. Low-coolant warnings, crusty residue at the fitting, and in ignored cases overheating warnings with the potential for engine damage. The same connector design is on the LK0 Traverse/Enclave and the related 2.7L L3B Colorado/Canyon trucks.

Fix: GM blinked first on this one: Special Coverage N262546590 (filed with NHTSA April 2026) extends coverage of the upper radiator hose quick-connector on 2024–2026 Acadia and Traverse and 2025–2026 Enclave to 5 years or 60,000 miles, with reimbursement for owners who already paid. Out of coverage it's a hose-and-connector replacement plus coolant — the class-action plaintiff's documented out-of-pocket on the same connector job was $489. A parallel class action (filed June 2026, N.D. Georgia) argues the coverage doesn't go far enough. If you buy one, get the special-coverage work done proactively rather than waiting for the puddle.

Sources: Yahoo Autos — GM Special Coverage N262546590 for Acadia/Traverse/Enclave radiator hose, CarComplaints news — GM radiator hose connector class action, Top Class Actions — GM coolant-leak defect class action (LK0 + L3B vehicles)

Symptoms: Two flavors. Dramatic: 'No Oil Pressure — Turn Off Engine Now' alerts at highway speed on nearly new cars — NHTSA complaints log events at 3,076, 4,650, 5,318 and 6,400 miles, including one diagnosed failed oil pump and one seized engine. Subtle: oil pressure that toggles rapidly or reads low at warm idle with no alert.

Fix: All warranty work so far, but know what the paper trail should say. GM issued service update N242441680 (April 2024) for engine oil and filter replacement on early 2024 Traverse/Acadia LK0 engines, and GM's published diagnosis for erratic idle oil pressure has dealers drop the oil pan and balancer assembly to inspect the four piston oil nozzles — a loose or missing nozzle center is the root cause. Worst cases got oil pumps or complete engines. On a used example, any oil-pressure event should come with dealer paperwork showing WHAT was inspected, not just an oil change and a shrug.

Sources: GM Authority — why your GMC Acadia oil pressure is low at idle (LK0 diagnosis), NHTSA — 2024 GMC Acadia engine complaints, Acadia Forum — oil pressure, 2025 Acadia 2.5T

Symptoms: Blank or black instrument panel and center screen on startup or while driving, a screen too dim to read in daylight (worse with polarized sunglasses), OnStar/telematics module dropouts killing GPS and connected features, and TPMS sensors that lose contact. Some owners report the telematics module on parts backorder while safety-adjacent features stay dark.

Fix: Software updates and module replacement under warranty. This generation runs GM's Google-built-in stack on the new Global B electrical architecture, and it's showing ordinary first-generation-software behavior — annoying, mostly not dangerous, and improving with updates. The only NHTSA recall on this generation to date is related trivia: 26V-114 (Feb 2026) covers 2026 Acadias among ~40 GM models whose radios weren't set to download the electronic owner's manual; dealers reset the radio free.

Sources: Lemberg Law — 2025 Acadia telematics/OnStar complaint reports, NHTSA — 2024 GMC Acadia electrical complaints

Tools: Floor jack + jack stands, Socket set + breaker bar, C-clamp or caliper piston tool, Torque wrench, Brake cleaner

1. Loosen the front lug nuts, raise and support the front end on jack stands, and remove the wheels.
2. Unbolt the caliper, hang it from the strut with a hook (never by the hose), and slide off the old pads.
3. Unbolt the caliper bracket and remove the old rotor; clean the hub face of rust before hanging the new rotor.
4. Compress the caliper piston, install the new pads with the supplied hardware and a film of brake grease on the contact points, and reinstall bracket and caliper to torque spec.
5. Repeat on the other side, refit the wheels, pump the pedal firm BEFORE driving, and bed the pads with a series of moderate stops.
6. If the dash pad-life percentage looks wrong afterward, have the dealer apply service update N242471431 — the brake-module pad-wear calibration is a known issue on these.

Tools: Ramps or jack + stands, Drain pan, Oil filter wrench, Socket set, Funnel

1. Warm the engine briefly, then raise and support the vehicle and remove the undertray fasteners to reach the drain plug.
2. Drain the oil, then replace the drain plug with a new washer and torque it snug.
3. Spin off the old filter (ACDelco PF66 is the factory fit), lube the new filter's gasket with fresh oil, and install it hand-tight plus a quarter turn.
4. Refill with a dexos-approved full synthetic in the grade printed on the oil fill cap, to the dipstick mark.
5. Start the engine and watch the oil-pressure reading stabilize — on THIS engine that gauge check is not optional — then check for leaks and reset the oil-life monitor.

Tools: Screwdriver (glovebox stops)

1. Open the glovebox, release the side stops to drop it down, and pull the cabin filter cover.
2. Slide out the old cabin filter and insert the new one with the airflow arrow oriented per the housing.
3. Unclip the engine airbox lid, swap in the new panel filter, and re-clip the lid.
4. Close everything up and confirm the glovebox stops re-seat.