2020-2025 Cadillac XT6 Problems: 23 Known Issues

Certain 2022 Cadillac XT6 crossovers were recalled by General Motors for a fuel tank rollover valve that may not seal properly in a rollover crash. NHTSA files the defect against the gasoline storage tank assembly. The rollover valve's whole purpose is to shut the tank's vent path when the XT6 is no longer upright, keeping gasoline inside the tank rather than letting it run out through the vent. On the recalled vehicles the valve can be dislodged from its position or absent altogether, which leaves nothing to close that path. GM's stated consequence is direct: fuel can leak during a rollover crash, and that raises the risk of a fire. This is not a drivability problem — the XT6 runs and refuels normally with the defect present, which is exactly why it is worth confirming by VIN rather than waiting to notice something wrong.

If you own a 2021 Cadillac XT6, this one is worth a VIN check. GM recalled a limited group of 2021 XT6, XT5 and GMC Acadia vehicles because the fuel supply lines may have been improperly attached and seated at the factory. Lines that are not properly seated may loosen or separate, causing a fuel leak, which increases the risk of a fire. The whole campaign covers 572 vehicles across all of the models listed, so inclusion is the exception rather than the rule for the XT6 — but the potential outcome is serious enough that verifying by VIN is the right move rather than waiting to notice a problem. GM's internal recall number is N212335590, and owner letters were mailed July 1, 2021.

GM recalled certain 2020 all-wheel-drive Cadillac XT6 vehicles (along with 2020 XT5, Buick Enclave, Chevrolet Traverse and GMC Acadia) because a plastic burr left over from the molding process can remain inside the fuel pump module's jet nozzle (mixing tube). The jet pump transfers fuel from the secondary side of the tank to the primary side; if the burr blocks it, the engine may not receive adequate fuel at low fuel levels. The result can be an engine stall without warning, which is why this was handled as a safety recall. This is a distinct defect from the 2021 fuel supply line recall (21V422), which concerns improperly seated fuel lines that can leak.

Only the 2020 model year of the Cadillac XT6 falls inside this GM recall, which addresses a start/stop transmission accumulator that may have left the plant with bolts missing from its endcap. Because those bolts hold the endcap against transmission oil pressure, the missing hardware can allow a transmission oil leak. The leak may progress to a loss of propulsion, increasing crash risk, and transmission fluid in the presence of an ignition source may increase the risk of fire. The same defect was found across a range of 2018-2020 Chevrolet, Buick, GMC and Cadillac vehicles; the XT6's exposure is the 2020 year alone.

The XT6's GM 9T65 9-speed automatic transmission exhibits shuddering during light throttle acceleration between 25-50 mph, similar to driving over rumble strips. The torque converter clutch wears prematurely, contaminating the transmission fluid.

Historical service update N242446290 identified certain 2024 XT6 inventory vehicles with out-of-specification internal transmission retaining rings. Dealers had to repair eligible inventory before delivery; the update expired July 31, 2025. This does not prove a sold vehicle missed the repair or exclude later diagnosis. Separately, PIP5974A describes possible snap-ring trouble on 2024 XT6 transmissions M3G/M3W built October 1, 2023–April 22, 2024, with P0746/P0747 and possible slipping or no drive.

GM PIP5608F covers 2020-2021 XT6 vehicles with 9-speed transmissions RPO M3G or M3W when torque-converter clutch shudder occurs on re-apply after a shift at 40 mph or below. GM identifies possible excessive assembly lubricant in the fluid and requires confirmation with TCC slip data or the scan-tool command test.

GM bulletin 21-NA-108 (which superseded PIP5257E) covers engine overheating with the cooling system contaminated by engine oil, and it lists the 2020-2021 Cadillac XT6 with the 3.6L LGX V6 among the affected applications. The failure is not a head gasket in the usual sense: pressurized oil from the main oil gallery migrates into a coolant water jacket through porosity or a thin-wall casting defect in the engine block. Because oil pressure is far higher than coolant pressure, oil pushes into the coolant rather than the other way round, and the surge tank and radiator fill with a thick brown oil-and-coolant emulsion that looks like a milkshake. That emulsion will not carry heat, so the engine overheats, and it plugs the radiator and heater core. GM bulletins 21-NA-147 and 22-NA-240 cover the related diagnosis of a coolant and/or oil leak with the malfunction indicator lamp on. This is engine-code specific — it is an LGX 3.6L casting issue and is not a claim about the 2.0L LSY turbo four also sold in the XT6.

GM bulletin PIP5863B addresses an illuminated malfunction indicator lamp with DTC U0672, lost communication with electric engine coolant pump G59. Its North American applicability includes XT6 vehicles with the 2.0L LSY engine. A pump-connection problem is a potential cause; the code alone does not establish a failed pump.

P0128 requires diagnosis before replacing parts. PIP5940 covers thermostat replacement on 2020–2023 XT6 vehicles with the 3.6L LGX and changes the repair to the thermostat housing rather than an unnecessary pipe-and-outlet assembly. It does not establish a failure rate. Separately, GM 22-NA-054 identifies a possible ECM calibration timing error on 2021 XT6 LGX vehicles with P0128, a check-engine warning, an inoperative temperature gauge or fans running after shutdown.

US recall 20V446 / GM N202305380 includes 18 selected 2020 XT6 vehicles within a combined 769-vehicle campaign. The XT6 build interval in the July 30, 2020 filing is March 16–July 15, 2020, with eligibility determined by part traceability. An improperly crimped inflator diffuser can separate during deployment and reduce roof-rail airbag performance, increasing injury risk. The filing does not identify a warning that owners can rely on to establish whether a particular module is affected.

If your 2020 or 2021 Cadillac XT6 was ordered with the optional Surround Vision feature, it may be part of NHTSA recall 22V709000. GM found that the coaxial cable connectors carrying the rearview camera signal may have been crimped improperly, and a faulty crimp can cause the rearview camera to fail outright or work only intermittently. The practical effect for an XT6 driver is a missing or unreliable rear image when reversing, which NHTSA notes reduces rear visibility and increases crash risk. XT6s without Surround Vision are not covered. The campaign as a whole spans 95,231 vehicles across all the models it includes - that number is for the entire campaign and says nothing about how many XT6s are involved. GM tracks the recall internally as N222378380 and mailed owner letters on January 18, 2023.

An internal short inside the K111 Fuel Pump Driver Control Module (FPDCM, also called the fuel pump power control module) can cause a cluster of drivability faults on 2021-2023 Cadillac XT6 vehicles. GM documented this first as preliminary information PIP5964 and then as service bulletin 24-NA-139, published July 2024, which replaces PIP5964D. The symptom set is broad and misleading: crank-but-no-start, stalling while driving, loss of power, rough idle, erratic shifting, and an inoperative or erratic fuel gauge, all with the check engine light on and multiple codes stored. Because the module drives fuel pump speed, technicians may chase a failing in-tank pump or a transmission concern before finding the module. The bulletin directs module replacement when P023F and/or P129F are set and diagnostics find no other cause. Owner reports of the failure exist on the Cadillac Owners Forum, including a 2021 XT6 Sport that would not start with P023F stored.

NHTSA campaign 24V459000 covers late-build Cadillac XT6 vehicles on which the instrument panel cluster may not illuminate when the hazard warning lights, high beams, or turn signals are activated. The cluster software fails to light the corresponding telltales, so the driver gets no confirmation that the hazards are flashing, that the high beams are on, or that a turn signal is active. The exterior lamps themselves still work — the failure is the driver's feedback. That matters because a driver who cannot see the high-beam indicator may leave the brights on and blind oncoming traffic, and a driver who cannot see the turn-signal telltale may leave a signal running or believe the hazards are off when the vehicle is stopped on a shoulder. This is a software defect in the instrument cluster, not a bulb or wiring failure.

XT6 owners report a "Steering Assist is Reduced — Drive with Care" or "Service Power Steering" message in the driver information center, usually with a noticeable increase in steering effort. GM bulletin 20-NA-215 covers this condition on XT5 and XT6 vehicles built between September 28 and October 22, 2020, and ties it to DTCs C0460 and/or C0545 stored in the power steering module. The XT6 uses a belt-drive electric rack with the motor and control module integrated into the steering gear; per the bulletin, internal components can make interference contact as the wheel turns, grounding and damaging internal electrical parts, which sets the code and the module deliberately cuts or reduces assist rather than allowing erratic assist. Steering is still mechanically connected — the car remains steerable — but effort rises sharply, which is most alarming at parking-lot speeds or in an evasive maneuver. Owners also describe a separate, milder version where assist fades after sustained low-speed maneuvering and returns once the system cools; that thermal derate is normal protection, not a failed rack, and it clears itself.

If you drive a 2022 Cadillac XT6, check this one. General Motors recalled a group of these SUVs after finding that the left-rear suspension toe link may not have been tightened properly. An under-tightened fastener can allow the toe link to go loose over time, and a loose toe link can separate outright. Separation can cause a loss of vehicle control and increases the risk of a crash. The NHTSA campaign number is 22V427000, and GM's own number for it is N222364330. The 2022 Cadillac XT5 and 2022 GMC Acadia are covered by the same campaign. NHTSA's record lists 736 potentially affected vehicles campaign-wide.

NHTSA campaign 23V172000 (GM safety recall N222389310) covers 613 model-year 2023 Cadillac XT6 vehicles built with an incorrect sun gear inside the transmission's final drive. The wrong gear does not retain the driver-side (left front) half-shaft correctly, and the shaft can disengage from the transmission. Two failure modes follow: while driving, the wheel stops receiving torque and the vehicle loses drive power; while parked, the park pawl can no longer hold the vehicle through a disengaged shaft, so the XT6 can roll away even with the shifter in Park. The same wrong-gear condition was recalled on the Cadillac XT5, Chevrolet Blazer and Traverse, and GMC Acadia, but confirm your own VIN rather than assuming a sibling's campaign applies.

GM bulletin 21-NA-240 describes an engine oil leak that may result from the amount of sealant at the LSY camshaft-carrier gasket. Oil can appear to originate at another front-engine joint. The bulletin directs technicians to locate the actual leak before selecting a repair; it does not establish that every equipped XT6 has this condition.

GM bulletin PIP6101A adds the 2.0L turbocharged LSY engine to a valvetrain ticking concern originally documented for the LK0 and L3B engines under PIP6101. On affected 2025 Cadillac XT6 vehicles with the LSY, owners may hear a top-end ticking noise from the valvetrain area. The cause is valve rocker arm debris getting inside the hydraulic valve lash adjusters and not allowing them to pump up with oil, resulting in a soft adjuster and excess valvetrain clearance that produces the tick. If even one soft adjuster is found, GM directs replacing all 16 lash adjusters and all 16 rocker arms. This is engine-code specific to the LSY four-cylinder and is not a 3.6L LGX V6 condition.

GM bulletin 19-NA-167 covers water leaking into the interior on the 2020-2021 Cadillac XT6 (alongside the 2017-2021 XT5 and GMC Acadia). Owners find wet carpet or headliner at the front and/or rear, on either side, typically after rain or a car wash. The cause is not the sunroof drains that owners and shops usually chase first: it is pinhole voids in the laser braze joint between the roof panel and the outer body ring, and in the seam sealer over it. The bulletin says the pinholes are most often found near the top of the windshield at the A-pillars, or near the top of the liftgate at the D-pillars. Water entering at the D-pillars runs down into the rear of the vehicle, and the bulletin specifically notes that on the XT6 the liftgate actuator may become noisy or inoperative as a result — so an electrical complaint at the tailgate is a symptom of the body leak, not a separate failure. Left alone, trapped water rots carpet padding, grows mold, and corrodes rear body connectors.

NHTSA campaign 23V681000 covers 2024 Cadillac XT6 vehicles whose windshield may not have been bonded to the body with the proper urethane sealant during assembly. The windshield is a structural part of the vehicle: it braces the roof in a rollover and it provides the backstop the passenger airbag deploys against. A windshield that is not properly bonded can separate from the body in a crash, so the passenger airbag may not restrain the occupant as designed and the roof loses crush resistance. On the road, an unbonded windshield can also let water and wind noise in.

Owners of 2021-2023 Cadillac XT6 vehicles built before the bulletin's VIN breakpoint report a grinding or groaning noise from the front brakes on the first few stops, particularly after the vehicle has sat overnight. It may feel like the ABS is active even though it is not. GM bulletin 21-NA-142 (current revision January 2025) says the cause may be the front disc brake pad material and has technicians check the pad stamp (GM9130 or GM9140). The same bulletin also covers the Buick Enclave, Cadillac XT5, Chevrolet Blazer and Traverse, and GMC Acadia within listed VIN ranges.

GM bulletin 22-NA-094, issued July 2022, addresses a loss of cabin heat on the Cadillac XT6 and XT5. Owners get little or no warm air from the vents even after the engine reaches operating temperature — the complaint typically shows up in cold weather and is easy to misdiagnose as a stuck thermostat, an air pocket in the cooling system, a blend door actuator, or a plugged heater core. GM traced it instead to a software anomaly in the engine control module; the bulletin covers 2.0L turbo (LSY) XT6s built through January 28, 2022. Because the fault is calibration rather than hardware, no part is actually broken, and owners who let a shop chase it mechanically can spend hundreds of dollars replacing a perfectly good thermostat or heater core before the real fix is applied.