2026 Chevrolet Trailblazer Engine Parts

This table covers the Balance shafts. Read more

This group shows a single part: GM GENUINE 12664239.

This table covers the chains that drive the balance shafts. Read more

One part is listed for the 2026 Chevrolet Trailblazer — GM GENUINE 12684151.

This table covers the guides that keep the balance-shaft chain on its path. Read more

One part is listed for the 2026 Chevrolet Trailblazer — GM GENUINE 12700133.

This table covers the Balance Shaft sprockets. Read more

GM GENUINE supplies both parts for the 2026 Chevrolet Trailblazer.

Listed part numbers: GM GENUINE 12693243 and GM GENUINE 12693244.

This table covers the camshafts that open the valves. Read more

GM GENUINE supplies the 4 Camshaft parts for the 2026 Chevrolet Trailblazer.

This group includes GM GENUINE 25205337, GM GENUINE 25205338 and GM GENUINE 25206537 and the remaining parts above.

This table covers the seals at each camshaft end. Typical signs include a wet housing, a drip after sitting, or fluid flung off a rotating shaft. Fix the surface the seal rides on. A new seal on a grooved shaft will leak again. Read more

This group shows a single part: GM GENUINE 12574477.

This table covers the bearings in the connecting-rod big ends. Typical signs include a growl that rises with speed, or play in the shaft or hub. Set preload the way the notes specify. A dry or crushed bearing fails quickly. Read more

One part is listed for the 2026 Chevrolet Trailblazer — GM GENUINE 12698279.

This table covers the crankshafts that turn piston motion into rotation. Read more

One part is listed for the 2026 Chevrolet Trailblazer — GM GENUINE 12701729.

This table covers the main bearings that support the crankshaft in the block. Typical signs include a growl that rises with speed, or play in the shaft or hub. Set preload the way the notes specify. A dry or crushed bearing fails quickly. Read more

11 Crankshaft Main Bearing parts for the 2026 Chevrolet Trailblazer come from GM GENUINE.

This table covers the Crankshaft Main Bearing Cap bolts. Read more

One part is listed for the 2026 Chevrolet Trailblazer — GM GENUINE 55487412.

This table covers the front and rear seals that keep oil in at the crankshaft. Typical signs include a wet housing, a drip after sitting, or fluid flung off a rotating shaft. Fix the surface the seal rides on. A new seal on a grooved shaft will leak again. Read more

This group shows a single part: GM GENUINE 12693989.

This table covers the Crankshaft Seal covers. Read more

One part is listed for the 2026 Chevrolet Trailblazer — GM GENUINE 55514589.

This table covers the cylinder heads that close the top of the block. Read more

2 Cylinder Head parts for the 2026 Chevrolet Trailblazer come from GM GENUINE.

Part numbers include GM GENUINE 25204903 and GM GENUINE 12694943.

This table covers the bolts that clamp the cylinder head to the block. Read more

GM GENUINE supplies the 3 Cylinder Head Bolt parts for the 2026 Chevrolet Trailblazer.

Part numbers include GM GENUINE 11547739, GM GENUINE 11548171 and GM GENUINE 11548293.

This table covers the head gaskets that seal the block to the cylinder head. Typical signs include seepage at the joint, a burnt-oil smell, or a leak that appears only after a long drive. Clean both flanges and torque in the sequence the notes or the manual call for. Read more

2 Cylinder Head Gasket parts are listed for the 2026 Chevrolet Trailblazer, from ACDELCO and GM GENUINE.

Listed part numbers: ACDELCO 12696638 and GM GENUINE 25207792.

This table covers multi-piece gasket sets for a cylinder-head job. Typical signs include the leaks that sent the engine or gearbox to the bench. Use every gasket the set is meant for that opening — leftover unused pieces usually belong to another configuration. Read more

One part is listed for the 2026 Chevrolet Trailblazer — GM GENUINE 25207408.

This table covers the Cylinder Head plugs. Typical signs include a leak at the drain or glow-plug hole, or a plug that has rounded off. Replace the crush washer and torque to the spec in the notes. Read more

2 Cylinder Head Plug parts for the 2026 Chevrolet Trailblazer come from GM GENUINE.

This group includes GM GENUINE 09427693 and GM GENUINE 11602951.

This table covers the Engine Block drain plugs. Read more

One part is listed for the 2026 Chevrolet Trailblazer — GM GENUINE 11602951.

This table covers the block heaters that warm the coolant or oil in cold weather. Read more

This group shows a single part: GM GENUINE 12586687.

This table covers the Engine Cover grommets. Read more

3 Engine Cover Grommet parts for the 2026 Chevrolet Trailblazer come from GM GENUINE.

Listed part numbers: GM GENUINE 12693848, GM GENUINE 12693849 and GM GENUINE 12693850.

This table covers the exhaust valves that let combustion gas out of the cylinder. Typical signs include a circuit that will not hold, a whistle, or a code for this valve. A stuck valve is often debris. Clean the ports before installing the new one. Read more

2 Exhaust Valve parts for the 2026 Chevrolet Trailblazer come from 2 brands — GM GENUINE and QUALCAST.

Listed part numbers: GM GENUINE 25207383 and QUALCAST 1030853.

This table covers the followers that drive a mechanical fuel pump off the camshaft. Read more

One part is listed for the 2026 Chevrolet Trailblazer — GM GENUINE 12718357.

This table covers the Harmonic Balancer bolts. Read more

This group shows a single part: GM GENUINE 25194208.

This table covers the Intake manifolds. Typical signs include an exhaust tick, a vacuum leak, or a gasket that has burned through. Replace the gaskets and hardware; a warped flange will leak with a new gasket alone. Read more

2 Intake Manifold parts for the 2026 Chevrolet Trailblazer come from GM GENUINE.

Part numbers include GM GENUINE 25204837 and GM GENUINE 12684024.

This table covers the Intake Manifold bolts. Read more

One part is listed for the 2026 Chevrolet Trailblazer — GM GENUINE 11548171.

This table covers the Intake Manifold covers. Read more

GM GENUINE supplies the 3 Intake Manifold Cover parts for the 2026 Chevrolet Trailblazer.

Listed part numbers: GM GENUINE 25206459, GM GENUINE 55512306 and GM GENUINE 25205261.

This table covers the gaskets between the intake manifold and the cylinder head. Typical signs include seepage at the joint, a burnt-oil smell, or a leak that appears only after a long drive. Clean both flanges and torque in the sequence the notes or the manual call for. Read more

2 Intake Manifold Gasket parts are listed for the 2026 Chevrolet Trailblazer, from ACDELCO and GM GENUINE.

Listed part numbers: ACDELCO 55486276 and GM GENUINE 12667033.

This table covers the intake valves that let air (and fuel, on port-injected engines) into the cylinder. Typical signs include a circuit that will not hold, a whistle, or a code for this valve. A stuck valve is often debris. Clean the ports before installing the new one. Read more

This group shows a single part: QUALCAST 1030854.

This table covers the mounts that hold the engine to the chassis. Typical signs include a clunk on takeoff, a vibration at idle, or a separated rubber insert. Support the powertrain before unbolting a mount, and torque the fasteners in the notes. Read more

4 Motor Mount parts for the 2026 Chevrolet Trailblazer come from 2 brands — ANCHOR and GM GENUINE. 3 parts fit every engine; the other 1 is engine-specific.

This group includes ANCHOR 3599, ANCHOR 3609 and GM GENUINE 60005993 and the remaining parts above.

This table covers the Motor Mount bolts. Read more

One part is listed for the 2026 Chevrolet Trailblazer — GM GENUINE 11547918.

This table covers the Motor Mount Bracket bolts. Read more

One part is listed for the 2026 Chevrolet Trailblazer — GM GENUINE 11546406.

This table covers the Motor Mount kits. Read more

This group shows a single part: ANCHOR 300961.

This table covers the engine oils listed by grade and specification for this engine. Typical signs include a low-oil lamp, knocking after a long interval, or oil that has gone thin and black well before the next service. Match the viscosity and spec in the notes (and on the filler cap). The tables group grades — they are not interchangeable. Read more

17 Oil parts for the 2026 Chevrolet Trailblazer come from 6 brands — MOBIL, LIQUI MOLY, VALVOLINE and 3 other brands. The "Popular" part is ACDELCO 109302. Every part fits both the 1.2L L3 Turbocharged and the 1.3L L3 Turbocharged.

The Full Synthetic section lists 15 options from LIQUI MOLY, MOBIL, VALVOLINE and 3 other brands — full-synthetic oils. ACDELCO 109302 is listed in this group.

In the High Mileage (>75,000 Miles) grade, MOBIL supplies 2 parts: oils grouped for high-mileage engines. A representative part number is MOBIL 122535.

This table covers the heat exchangers that cool engine oil. Typical signs include oil at the cooler fittings, or coolant that looks like a milkshake. Pressure-test both circuits after a cooler swap — a leak here mixes oil and coolant. Read more

2 Oil Cooler parts for the 2026 Chevrolet Trailblazer come from 2 brands — ACDELCO and GM GENUINE.

Listed part numbers: ACDELCO 55505451 and GM GENUINE 12704459.

This table covers the gaskets that seal the Oil Cooler. Typical signs include seepage at the joint, a burnt-oil smell, or a leak that appears only after a long drive. Clean both flanges and torque in the sequence the notes or the manual call for. Read more

3 Oil Cooler Gasket parts are listed for the 2026 Chevrolet Trailblazer, from GM GENUINE and DORMAN.

Part numbers include DORMAN 66219, GM GENUINE 55505453 and GM GENUINE 12669556.

This table covers the Oil Cooler Hose pipes. Read more

This group shows a single part: GM GENUINE 12694297.

This table covers the Oil Cooler lines. Typical signs include a wet fitting, a rusted pipe, or a pressure loss in this circuit. Flare or thread the new line the way the notes specify; a kinked replacement will fail early. Read more

This group shows a single part: GM GENUINE 12706072.

This table covers the seals at the Oil Cooler. Typical signs include a wet housing, a drip after sitting, or fluid flung off a rotating shaft. Fix the surface the seal rides on. A new seal on a grooved shaft will leak again. Read more

GM GENUINE supplies the 3 Oil Cooler Seal parts for the 2026 Chevrolet Trailblazer. 1 part fits every engine; the other 2 are engine-specific.

Part numbers include GM GENUINE 12698625, GM GENUINE 12674178 and GM GENUINE 12733672.

This table covers the Oil Dipstick tubes. Read more

This group shows a single part: GM GENUINE 12701528.

This table covers the seals at the Oil Dipstick / Tube. Typical signs include a wet housing, a drip after sitting, or fluid flung off a rotating shaft. Fix the surface the seal rides on. A new seal on a grooved shaft will leak again. Read more

GM GENUINE supplies both parts for the 2026 Chevrolet Trailblazer. 1 part fits every engine; the other 1 is engine-specific.

Part numbers include GM GENUINE 24504031 and GM GENUINE 12670252.

This table covers the drain plugs in the oil pan. Read more

6 Oil Drain Plug parts for the 2026 Chevrolet Trailblazer come from 2 brands — DORMAN and GM GENUINE.

Listed part numbers: DORMAN 090948CD, DORMAN 090948 and DORMAN 090854CD, plus the other parts above.

This table covers the crush washers and gaskets under the oil drain plug. Typical signs include seepage at the joint, a burnt-oil smell, or a leak that appears only after a long drive. Clean both flanges and torque in the sequence the notes or the manual call for. Read more

GM GENUINE supplies both parts for the 2026 Chevrolet Trailblazer.

Listed part numbers: GM GENUINE 12616850 and GM GENUINE 12667457.

This table covers the caps on the oil filler neck. Read more

2 Oil Filler Cap parts for the 2026 Chevrolet Trailblazer come from ACDELCO. 1 part fits every engine; the other 1 is engine-specific.

This group includes ACDELCO FC275 and ACDELCO FC268.

This table covers the gaskets that seal the Oil Filler Cap. Typical signs include seepage at the joint, a burnt-oil smell, or a leak that appears only after a long drive. Clean both flanges and torque in the sequence the notes or the manual call for. Read more

One part is listed for the 2026 Chevrolet Trailblazer — GM GENUINE 24100002.

This table covers the oil filters that screw onto this engine's filter mount. Typical signs include low oil pressure after a service, or a filter that will not spin off because the old gasket stayed on the block. Lube the new gasket and tighten to the spec on the box; a double-gasket install dumps the sump on the first drive. Read more

21 Oil Filter parts for the 2026 Chevrolet Trailblazer come from 9 brands — WIX, ACDELCO, FVP and 6 other brands. The "Popular" part is WIX WL10290XP.

The Economy section lists 8 options from FVP, PRO-TEC, VARIOUS MFR and 2 other brands — the catalog's value-priced group. CHAMP / LUBER-FINER PH10064 is listed in this group.

The High Performance / Heavy Duty section lists 4 options from WIX and MOBIL — grouped under the catalog's "High Performance / Heavy Duty" designation — the notes column spells out what sets them apart. WIX WL10290XP is listed in this group.

In the Standard Replacement grade, ACDELCO, WIX, HASTINGS / BALDWIN and 1 other brand supply 9 parts: built to original-equipment specification. A representative part number is ACDELCO PF64.

This table covers the Oil Galley plugs. Typical signs include a leak at the drain or glow-plug hole, or a plug that has rounded off. Replace the crush washer and torque to the spec in the notes. Read more

This group shows a single part: GM GENUINE 11569584.

This table covers the oil pans that hold the engine's oil sump. Read more

GM GENUINE supplies both parts for the 2026 Chevrolet Trailblazer.

Part numbers include GM GENUINE 25204203 and GM GENUINE 12718806.

This table covers the gaskets between the oil pan and the block. Typical signs include seepage at the joint, a burnt-oil smell, or a leak that appears only after a long drive. Clean both flanges and torque in the sequence the notes or the manual call for. Read more

3 Oil Pan Gasket parts for the 2026 Chevrolet Trailblazer come from GM GENUINE. 1 part fits every engine; the other 2 are engine-specific.

Listed part numbers: GM GENUINE 55504437, GM GENUINE 55504438 and GM GENUINE 12663435.

This table covers the Oil pumps. Typical signs include noise from the pump, no pressure, or fluid that never arrives at the outlet. Prime or fill the pump as the notes require. A dry start is a common way to kill a new unit. Read more

This group shows a single part: GM GENUINE 55503981.

This table covers the Oil Pump bolts. Read more

GM GENUINE supplies both parts for the 2026 Chevrolet Trailblazer.

Part numbers include GM GENUINE 11548167 and GM GENUINE 11547739.

This table covers the Oil Pump Control Valve solenoids. Typical signs include a harsh or missing shift, or a code for this solenoid circuit. Check resistance and the connector before dropping the pan for a solenoid. Read more

2 Oil Pump Control Valve / Solenoid parts are listed for the 2026 Chevrolet Trailblazer, from ACDELCO and GM GENUINE.

This group includes ACDELCO 55595870 and GM GENUINE 12740050.

This table covers the seals at the Oil Pump Control Valve / Solenoid. Typical signs include a wet housing, a drip after sitting, or fluid flung off a rotating shaft. Fix the surface the seal rides on. A new seal on a grooved shaft will leak again. Read more

This group shows a single part: GM GENUINE 55502517.

This table covers the Oil Pump sprockets. Read more

One part is listed for the 2026 Chevrolet Trailblazer — GM GENUINE 12693242.

This table covers the Oil Temperature senders. Read more

One part is listed for the 2026 Chevrolet Trailblazer — GM GENUINE 12723682.

This table covers the pistons that travel in each cylinder. Typical signs include knock, blow-by, or a cylinder that will not hold compression. Piston work is a short-block job. Match bore, pin and ring pack in the notes — not the photo. Read more

GM GENUINE supplies both parts for the 2026 Chevrolet Trailblazer.

Listed part numbers: GM GENUINE 12710889 and GM GENUINE 12663172.

This table covers the Piston Pin retainers. Read more

This group shows a single part: GM GENUINE 12639680.

This table covers the rings that seal each piston to the cylinder wall. Read more

GM GENUINE supplies both parts for the 2026 Chevrolet Trailblazer.

This group includes GM GENUINE 55507069 and GM GENUINE 12698277.

This table covers the rocker arms that transfer cam motion to the valves. Read more

This group shows a single part: GM GENUINE 55569172.

This table covers the Timing belts. Typical signs include squeal on cold start, cracked ribs, or glazing. Spin the tensioner and idlers by hand while the belt is off. Read more

One part is listed for the 2026 Chevrolet Trailblazer — GM GENUINE 55489417.

This table covers the Timing Belt pulleys. Typical signs include a growl or chirp that follows engine speed, or a pulley that will not spin freely by hand. Spin each pulley with the belt off. Roughness or play means replace it with the belt. Read more

This group shows a single part: GM GENUINE 25204526.

This table covers the Timing Belt tensioners. Typical signs include belt flutter, a chirp that returns after a new belt, or an arm that no longer damps. Replace the tensioner with the belt at higher mileage. Read more

This group shows a single part: GM GENUINE 25205813.

This table covers the Timing Cam sprockets. Read more

This group shows a single part: GM GENUINE 25208644.

This table covers the timing chains that keep the cams in time with the crank. Read more

One part is listed for the 2026 Chevrolet Trailblazer — GM GENUINE 12704385.

This table covers the guides and dampers that keep the timing chain on its path. Read more

GM GENUINE supplies both parts for the 2026 Chevrolet Trailblazer.

Listed part numbers: GM GENUINE 11561619 and GM GENUINE 12701146.

This table covers the tensioners that keep the timing chain taut. Typical signs include belt flutter, a chirp that returns after a new belt, or an arm that no longer damps. Replace the tensioner with the belt at higher mileage. Read more

This group shows a single part: GM GENUINE 12688897.

This table covers the Timing covers. Read more

One part is listed for the 2026 Chevrolet Trailblazer — GM GENUINE 55487381.

This table covers the Timing Cover bolts. Read more

This group shows a single part: GM GENUINE 11548002.

This table covers the crankshaft sprockets that drive the timing chain or belt. Read more

2 Timing Crank Sprocket parts for the 2026 Chevrolet Trailblazer come from GM GENUINE.

This group includes GM GENUINE 55512181 and GM GENUINE 12693245.

This table covers the Torque Strut mounts. Typical signs include a clunk on takeoff, a vibration at idle, or a separated rubber insert. Support the powertrain before unbolting a mount, and torque the fasteners in the notes. Read more

2 Torque Strut Mount parts are listed for the 2026 Chevrolet Trailblazer, from ANCHOR and GM GENUINE. 1 part fits every engine; the other 1 is engine-specific.

Part numbers include ANCHOR 3552 and GM GENUINE 60009130.

This table covers the turbochargers that compress intake air. Read more

2 Turbocharger parts for the 2026 Chevrolet Trailblazer come from GM GENUINE.

Part numbers include GM GENUINE 25207819 and GM GENUINE 25207918.

This table covers the Turbocharger Boost sensors. Typical signs include a warning lamp, a stored code, or a reading that drops out when the harness is wiggled. Inspect the connector and ground before replacing the sensor — wiring faults are often condemned as bad sensors. Read more

One part is listed for the 2026 Chevrolet Trailblazer — GM GENUINE 12694431.

This table covers the Turbocharger Coolant lines. Typical signs include a wet fitting, a rusted pipe, or a pressure loss in this circuit. Flare or thread the new line the way the notes specify; a kinked replacement will fail early. Read more

4 Turbocharger Coolant Line parts for the 2026 Chevrolet Trailblazer come from GM GENUINE.

Listed part numbers: GM GENUINE 25204920, GM GENUINE 55509610 and GM GENUINE 12703243, plus the other parts above.

This table covers the gaskets that seal the Turbocharger. Typical signs include seepage at the joint, a burnt-oil smell, or a leak that appears only after a long drive. Clean both flanges and torque in the sequence the notes or the manual call for. Read more

One part is listed for the 2026 Chevrolet Trailblazer — GM GENUINE 12667359.

This table covers the Turbocharger Heat shields. Typical signs include a bent shield rubbing a rotor, or rust-through that leaves the backing open. A rubbing shield will eat a new rotor. Straighten or replace it before the wheel goes back on. Read more

GM GENUINE supplies both parts for the 2026 Chevrolet Trailblazer.

This group includes GM GENUINE 55494843 and GM GENUINE 25207191.

This table covers the fasteners that mount the turbocharger. Read more

One part is listed for the 2026 Chevrolet Trailblazer — GM GENUINE 11549028.

This table covers the Turbocharger Oil lines. Typical signs include a wet fitting, a rusted pipe, or a pressure loss in this circuit. Flare or thread the new line the way the notes specify; a kinked replacement will fail early. Read more

3 Turbocharger Oil Line parts for the 2026 Chevrolet Trailblazer come from GM GENUINE.

Listed part numbers: GM GENUINE 55495320, GM GENUINE 55497458 and GM GENUINE 12687723.

This table covers the Turbocharger Oil Line Gasket O-rings. Typical signs include a seep at a fitting or a housing that weeps after a service. Lube the new O-ring with the fluid it will see, and do not roll it into the groove. Read more

5 Turbocharger Oil Line Gasket / O-Ring parts for the 2026 Chevrolet Trailblazer come from GM GENUINE.

Listed part numbers: GM GENUINE 55487539, GM GENUINE 55514397 and GM GENUINE 12669556, plus the other parts above.

This table covers the Turbocharger Wastegate hoses. Typical signs include swelling, cracks, a soft spot, or a leak at a clamp. Replace adjacent aged hoses while the system is drained — they share the same heat cycle. Read more

This group shows a single part: GM GENUINE 55498489.

This table covers the Turbocharger Wastegate Solenoid actuators. Typical signs include a door or range that will not move, or a click with no motion. Confirm the command signal before replacing the actuator — a failed module looks the same. Read more

3 Turbocharger Wastegate Solenoid / Actuator parts for the 2026 Chevrolet Trailblazer come from GM GENUINE.

This group includes GM GENUINE 55599331, GM GENUINE 12702113 and GM GENUINE 12678523.

This table covers the Turbocharger Wastegate Solenoid / Actuator retainers. Read more

This group shows a single part: GM GENUINE 12683885.

This table covers the Valve covers. Read more

GM GENUINE supplies both parts for the 2026 Chevrolet Trailblazer.

Listed part numbers: GM GENUINE 55514967 and GM GENUINE 25206783.

This table covers the gaskets that seal the valve cover to the cylinder head. Typical signs include seepage at the joint, a burnt-oil smell, or a leak that appears only after a long drive. Clean both flanges and torque in the sequence the notes or the manual call for. Read more

4 Valve Cover Gasket parts for the 2026 Chevrolet Trailblazer come from GM GENUINE.

This group includes GM GENUINE 55487546, GM GENUINE 12670503 and GM GENUINE 12671789 and the remaining parts above.

This table covers the lifters / tappets that transfer cam motion to the valves. Read more

This group shows a single part: GM GENUINE 12663277.

This table covers the keepers that lock each valve-spring retainer to the stem. Read more

One part is listed for the 2026 Chevrolet Trailblazer — GM GENUINE 90529533.

This table covers the seals on each valve stem that control oil into the guides. Typical signs include a wet housing, a drip after sitting, or fluid flung off a rotating shaft. Fix the surface the seal rides on. A new seal on a grooved shaft will leak again. Read more

This group shows a single part: GM GENUINE 25210172.

This table covers the oil-control solenoids that command the cam phasers. Typical signs include a door or range that will not move, or a click with no motion. Confirm the command signal before replacing the actuator — a failed module looks the same. Read more

2 Variable Valve Timing (VVT) Solenoid / Actuator parts for the 2026 Chevrolet Trailblazer come from GM GENUINE.

This group includes GM GENUINE 55595279 and GM GENUINE 12698402.

This table covers the seals at the Variable Valve Timing (VVT) Solenoid Gasket. Typical signs include a wet housing, a drip after sitting, or fluid flung off a rotating shaft. Fix the surface the seal rides on. A new seal on a grooved shaft will leak again. Read more

GM GENUINE supplies both parts for the 2026 Chevrolet Trailblazer.

Part numbers include GM GENUINE 55499462 and GM GENUINE 12698384.

This table covers the cam phaser sprockets used by the variable-valve-timing system. Read more

2 Variable Valve Timing (VVT) Sprocket parts for the 2026 Chevrolet Trailblazer come from GM GENUINE.

This group includes GM GENUINE 12698848 and GM GENUINE 12698849.