Lifter failures dominate the complaints. Owners with 70k–115k miles report sudden ticking, rough idle, and power loss—sometimes without warning lights. The AFM/DOD system's hydraulic lifters collapse, bend pushrods, and damage camshafts. Repairs run $7,100 to $7,512 for lifter and related work; full engine replacement costs $18,000 or more. One owner's lifter failed again within 2,000 miles of a $7,100 repair. Owners mention a service bulletin exists, but GM has not issued a recall, though 2019+ models received one for the same lifter system.
Alongside lifters, owners report rough idle with shake but no check engine light—a dealership couldn't diagnose it across two 2015 Yukons and suggested waiting for more complaints. Intermittent power loss and hesitation also appear, with one dealer confirming GM is aware but hasn't recalled.
AC condenser cracks are common around 80k–100k miles; replacements cost $1,000–$1,600. One owner notes the part was backorder two months, suggesting volume failures. Catalytic converter and radiator leaks also appear, the latter affecting multiple model lines with inconsistent warranty coverage. A few owners report cylinder compression failure and sudden engine shutdown without prior symptoms.
The thread linking many failures: owners change oil on schedule, receive no warning, then face sudden power loss or rebuild costs they can't cover.
Failure modes owners describe
Lifter failure (AFM/DOD system)
Hydraulic lifter collapse or failure in the Active Fuel Management (AFM) or Displacement on Demand (DOD) system, often affecting Bank One lifters. Owners report this causes rough idle, ticking noise, and can lead to bent pushrods and camshaft damage, potentially requiring engine rebuild or replacement.
When: 70k–115k miles; one case at 94k miles
Symptoms owners cite: Ticking or tick noise from engine; Rough idle with vehicle shake; Loss of power while driving; Engine shutdown without warning lights in some cases; Engine shaking at highway speeds
Codes mentioned: P0303 (Cylinder 3 misfire), Flashing check engine light
Repairs/costs cited: Replacement of all Bank One lifters, bent pushrods, camshaft replacement, engine rebuild ($7,100–$7,512), or full engine replacement ($18,000). One owner reported lifter failure recurred within 2,000 miles after initial $7,100 repair.
Recalls/TSBs owners mention: Service bulletin issued on lifter problem; no recall issued. GM aware of issue but has not issued a recall for 2015 models. One owner references approved recall on 2019 and newer models with same lifter system.
Cylinder compression failure
Loss of compression in individual cylinders, resulting in inability to restart and requiring engine replacement. Reported without prior warning signs.
When: 100k–107k miles
Symptoms owners cite: Sudden loss of motive power while driving; Vehicle failure to restart; No warning lights illuminated prior to failure
Codes mentioned: Engine compression failure in cylinder 7
Repairs/costs cited: Full engine replacement required.
Recalls/TSBs owners mention: One case noted NHTSA Campaign Number 25V274000 (Engine and Engine Cooling); manufacturer was notified and case opened, owner referred to NHTSA Hotline.
Rough idle with vibration and misfire
Engine idle fluctuates, causing rough running and shake sensation without check engine light present. Dealer attempts to resolve with motor mount adjustment but issue persists. Multiple vehicles exhibit same symptom.
When: Timing not specified in complaints
Symptoms owners cite: Rough idle at stops or in Drive; Vehicle shake and fluctuation up and down; Feeling vehicle may stall; No check engine light in some cases
Codes mentioned: No diagnostic code retrieved in reported cases
Repairs/costs cited: Motor mount adjustment attempted without resolution; dealership unable to diagnose root cause and suggested waiting for additional complaints.
Catalytic converter failure
Catalytic converter requires replacement at moderate mileage. Reported as single occurrence with check engine light and vibration.
When: 120k miles
Symptoms owners cite: Check engine warning light illumination; Abnormal vibration while driving at 25 mph
Codes mentioned: Check engine light present
Repairs/costs cited: Catalytic converter replacement required (cost not stated). Not yet repaired at time of complaint.
Intermittent power loss and acceleration hesitation
Vehicle experiences sudden loss of power or hesitation to accelerate while driving, with recovery after several seconds. Reported as intermittent but recurrent.
When: Timing and mileage not specified
Symptoms owners cite: Loud noise from engine followed by loss of acceleration; Slow acceleration recovery (approximately 3 seconds); Vehicle shaking while running in Park; Inability to drive over 30 mph without shaking and misfiring sounds
Codes mentioned: No diagnostic code retrieved in reported cases
Recalls/TSBs owners mention: Dealer advised that GM is aware of issue but has not issued a recall.
Air conditioning condenser failure
Cracks develop in the air conditioning condenser, causing complete loss of cooling function. Two owners report this at relatively low mileage and note parts are on backorder, suggesting widespread occurrence.
When: 80k–107k miles; one complaint mentions 2-year ownership timeline
Symptoms owners cite: Complete loss of air conditioning function; Visible crack in condenser unit
Repairs/costs cited: Condenser replacement costs $1,000–$1,600. One owner notes the part was on backorder for 2 months, indicating many others have the same issue.
Radiator leak
Radiator develops leak. Owner notes this is a known defect affecting multiple model lines (Tahoe, Silverado, Suburban) but GM coverage is inconsistent across vehicles.
When: Timing not specified
Symptoms owners cite: Radiator leakage
Recalls/TSBs owners mention: GM refuses to cover repair for all trucks; coverage is selective and criteria are unclear. Known defect in multiple models but not uniformly addressed.
Synthesized from 20 NHTSA owner complaints — unverified consumer
allegations, summarized for patterns. The verbatim filings appear below.