The 2021 Traverse shares the C1XX platform with the Enclave and Acadia, primarily using the 3.6L V6 (RSO engine code). While newer than previous generations, this platform still battles transmission cooler failures and timing chain wear that plagued earlier LFY/LLT V6 engines, plus the 9-speed automatic has proven troublesome.
Transmission Oil Cooler Line Failure
Common · high severity
Typical onset: 40,000-80,000 mi
Symptoms: Transmission fluid leaking from radiator area or cooler line connections, Pink fluid under vehicle or transmission slipping/harsh shifts if fluid level drops, Check Engine light with low fluid codes
Fix: Replace transmission oil cooler lines and often the cooler itself. 2-3 hours labor. The quick-connect fittings corrode and crack, especially in rust-belt states. Cooler internal failure can cross-contaminate coolant and trans fluid requiring full flush.
Estimated cost: $600-1,200
9-Speed Automatic Transmission Shudder and Torque Converter Issues
Common · medium severity
Typical onset: 30,000-70,000 mi
Symptoms: Shudder or vibration during light acceleration between 25-50 mph, Harsh or delayed 2-3 and 3-4 upshifts, Transmission hesitation from stop, Whining noise during deceleration
Fix: GM issued TSB 21-NA-082 for torque converter shudder requiring software update and often trans fluid replacement with specific friction modifier. Severe cases need torque converter replacement at 8-12 hours labor. Some units develop valve body issues requiring internal work.
Estimated cost: $400-3,500
Timing Chain Stretch and Actuator Failure (3.6L V6)
Occasional · high severity
Typical onset: 80,000-130,000 mi
Symptoms: Rattling noise on cold start for 2-3 seconds, Check Engine light with P0016 or P0017 cam/crank correlation codes, Rough idle or misfires, Advanced cases: catastrophic engine failure if chain jumps
Fix: Requires timing chain replacement on both banks, actuators, guides, and tensioners. 12-16 hours labor. The 3.6L V6 is known for this across GM platforms. Not changed at any service interval—fails from wear. Often discover cam lobe wear during repair requiring cylinder head work.
Estimated cost: $2,800-4,500
High-Pressure Fuel Pump Failure (3.6L V6)
Occasional · high severity
Typical onset: 60,000-100,000 mi
Symptoms: Hard start or extended cranking, Loss of power under acceleration, Check Engine light with P0087 fuel pressure too low code, Engine stalling or running rough, Metal shavings in fuel system from internal pump failure
Fix: Replace high-pressure fuel pump on driver side of engine (mounted to cylinder head). 3-4 hours labor. When pump fails internally, metal debris contaminates injectors requiring full fuel system cleaning and often injector replacement adding significant cost.
Estimated cost: $1,200-3,000
EVAP Purge Valve and Canister Issues
Common · low severity
Typical onset: 50,000-90,000 mi
Symptoms: Check Engine light with P0441, P0446, or P0455 EVAP system codes, Fuel smell near vehicle, Difficulty filling gas tank or pump clicking off repeatedly, Rough idle when cold
Fix: Replace purge valve (1 hour) or EVAP canister with vent valve (2 hours). Purge valves stick open causing rich conditions. Canisters saturate from topping off tank or fail internally. Both are common on this platform.
Estimated cost: $250-650
Water Pump Leaks (3.6L V6)
Occasional · medium severity
Typical onset: 70,000-110,000 mi
Symptoms: Coolant leak from front passenger side of engine, Coolant odor in cabin or under hood, Low coolant warning light, Overheating if neglected
Fix: Water pump is internal, driven by timing chain. Replacement requires partial timing chain removal. 6-8 hours labor. Smart to replace timing components while in there if mileage is high. Pump seal failure is the typical culprit.
Estimated cost: $1,400-2,200
Power Liftgate Struts and Module Failure
Occasional · low severity
Symptoms: Liftgate fails to open or close, Liftgate drops quickly or won't stay up, Intermittent operation or error messages on DIC, Motor runs but gate doesn't move
Fix: Struts wear and lose pressure (1.5 hours for both). Control module also fails, particularly after jump-starts or voltage spikes (2 hours labor, requires programming). Struts are wear items but fail prematurely on heavy three-row SUVs.
Estimated cost: $400-1,100
Owner tips
Change transmission fluid every 50,000 miles with AC Delco full synthetic—do NOT follow the lifetime fluid myth
Use Top Tier fuel and replace fuel filter every 60,000 miles to protect high-pressure fuel system
Listen for timing chain rattle at cold start—catch it early before catastrophic failure
Inspect transmission cooler lines annually in rust-belt climates and consider aftermarket steel-braided replacements
Buy if low mileage with documented trans services, but budget $3-5K for timing chain work around 100K—the 9-speed trans and fuel system issues make 2021s riskier than expected for their age.
AI-assisted summary drawn from NHTSA recall data, our labor-times database, and platform knowledge. Not a substitute for a pre-purchase inspection on a specific vehicle.
Fitment notes: H6 group also compatible; AGM battery recommended for Start-Stop system
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Every control module on the 2018-2022 Chevrolet Traverse — where it lives, replacement time, and what it takes to program a replacement. Modules marked dealer / factory tool won't work after a part swap alone — budget for programming.
📍 Integrated with rear camera assembly, center of liftgate above license plate
🔧 GDS2 or Autel
⚠️ Camera alignment/calibration may be required
Headlamp Control Module (HCM)0.5 hr R&Raftermarket tool +0.2 hrwith automatic headlamps or LED/HID lighting▸ programming details
📍 Engine compartment, behind driver side headlamp assembly
🔧 GDS2 or Autel
⚠️ Configuration for headlamp type required
Aftermarket tool coverage varies by software version and vehicle build — treat "aftermarket tool" rows as "usually possible" and verify against your tool maker's coverage list before promising a customer. Spot a wrong location or hour? Tell us — corrections ship fast here.
General Motors, LLC (GM) is recalling certain 2020-2022 Chevrolet Traverse and 2021-2022 Buick Enclave vehicles. 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.
Consequence: Roof rail air bags that do not deploy as intended increase the risk of injury in a crash.
Remedy: Dealers will replace the harness connector to the roof rail air bags, free of charge. Owner notification letters were mailed on April 29, 2022. Owners may contact Buick customer service at 1-800-521-7300 or Chevrolet customer service at 1-800-222-1020. GM's number for this recall is N212352140.
POWER TRAIN:AUTOMATIC TRANSMISSION · 21V817000
2021-10-18
Braun Corporation (Braun) is recalling certain 2020-2021 Chevrolet Traverse wheelchair accessible vehicles with Power In-floor Ramp conversion. 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.
Consequence: A transmission fluid leak can cause a loss of drive power, increasing the risk of a crash. In addition, a leak in the presence of an ignition source increases the risk of a fire.
Remedy: Dealers will replace the screw and clip, and inspect for signs of contact with the transmission, free of charge. Owner notification letters were mailed November 29, 2021. Owners may contact Braun customer service at 1-800-488-0359.
AIR BAGS:SENSOR:FRONTAL IMPACT · 21V472000
2021-06-24
General Motors, LLC (GM) is recalling certain 2021 Chevrolet 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.
Consequence: Air bags that do not deploy as intended can increase the risk of injury.
Remedy: Dealers will update the air bag calibration software, free of charge. Owner notification letters were mailed on July 29, 2021. Owners may contact Chevrolet customer service at 1-800-222-1020 and Buick customer service at 1-800-521-7300. GM's number for this recall is N212340220.
Performance
Horsepower
310hp
Torque
266lb-ft
0–60 mph
6.9sec
Quarter mile
15.3sec
Top speed
130mph
Fuel economy (EPA)
City
18mpg
Highway
27mpg
Combined
21mpg
Fuel
Regular Gasoline
Capability & size
Towing capacity
5,000lb
Payload
1,623lb
Curb weight
4,362lb
EPA class
Standard Sport Utility Vehicle 2WD
Wiper blades
Second generation (2018+). Driver and passenger use standard J-hook attachment.
Size-standard part numbers — verify your connector type before buying. Rear blades are model-specific; check the package's vehicle list.
Fuel economy figures are EPA data via fueleconomy.gov (median across matching trims). Performance figures are compiled estimates for the 2021 Chevrolet Traverse 3.6L V6 and can vary by trim.
🔧 Database maintained under the daily editorial review of Chris Hackleman · Master Technician · 20+ years and Jeff Moore · Master Mechanic · 20+ years.