2026 GMC Sierra 1500 Engine Parts

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

3 Camshaft parts for the 2026 GMC Sierra 1500 come from GM GENUINE.

Part numbers include GM GENUINE 12745084, GM GENUINE 12739839 and GM GENUINE 40009063.

This table covers the Camshaft bolts. Read more

One part is listed for the 2026 GMC Sierra 1500 — GM GENUINE 55496367.

This table covers the Circular / Semi-Circular 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

One part is listed for the 2026 GMC Sierra 1500 — GM GENUINE 11546667.

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

This group shows a single part: GM GENUINE 55490523.

This table covers the Crankcase pressure sensors. Typical signs include a check-engine light for MAP or fuel-rail pressure, or a limp mode under load. A vacuum leak or a clogged reference line will fake a bad pressure sensor. Read more

One part is listed for the 2026 GMC Sierra 1500 — GM GENUINE 12814873.

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

This group shows a single part: GM GENUINE 40009035.

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

GM GENUINE supplies the 3 Crankshaft Seal parts for the 2026 GMC Sierra 1500.

This group includes GM GENUINE 12693989, GM GENUINE 55509254 and GM GENUINE 40009072.

This table covers the Crankshaft Seal covers. Read more

This group shows a single part: GM GENUINE 12741554.

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

One part is listed for the 2026 GMC Sierra 1500 — GM GENUINE 12733805.

This table covers the Cylinder Head Alignment Dowel pins. Read more

This group shows a single part: GM GENUINE 12570326.

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

3 Cylinder Head Bolt parts for the 2026 GMC Sierra 1500 come from GM GENUINE.

Part numbers include GM GENUINE 11603109, GM GENUINE 11547740 and GM GENUINE 11547739.

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

This group shows a single part: GM GENUINE 12691233.

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

GM GENUINE supplies both parts for the 2026 GMC Sierra 1500.

This group includes GM GENUINE 11570754 and GM GENUINE 12691176.

This table covers the Engine Block drain plugs. Read more

2 Engine Block Drain Plug parts for the 2026 GMC Sierra 1500 come from GM GENUINE.

Listed part numbers: GM GENUINE 11602951 and GM GENUINE 11548315.

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

One part is listed for the 2026 GMC Sierra 1500 — GM GENUINE 12586687.

This table covers the Engine Cover grommets. Read more

GM GENUINE supplies the 4 Engine Cover Grommet parts for the 2026 GMC Sierra 1500.

This group includes GM GENUINE 12559120, GM GENUINE 12594875 and GM GENUINE 12737359 and the remaining parts above.

This table covers the Engine Cover retainers and clips. Read more

GM GENUINE supplies both parts for the 2026 GMC Sierra 1500.

Part numbers include GM GENUINE 10121502 and GM GENUINE 11518792.

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

This group shows a single part: GM GENUINE 12718357.

This table covers the crankshaft pulleys / harmonic balancers at the front of the engine. Read more

2 Harmonic Balancer parts for the 2026 GMC Sierra 1500 come from GM GENUINE.

Listed part numbers: GM GENUINE 12705813 and GM GENUINE 55512109.

This table covers the Intake insulators. Read more

This group shows a single part: GM GENUINE 12559120.

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

GM GENUINE supplies both parts for the 2026 GMC Sierra 1500.

Part numbers include GM GENUINE 12698870 and GM GENUINE 40009521.

This table covers the Intake Manifold bolts. Read more

2 Intake Manifold Bolt parts for the 2026 GMC Sierra 1500 come from GM GENUINE.

This group includes GM GENUINE 11548171 and GM GENUINE 11588352.

This table covers the Intake Manifold covers. Read more

This group shows a single part: GM GENUINE 40009488.

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 for the 2026 GMC Sierra 1500 come from GM GENUINE.

This group includes GM GENUINE 12663540 and GM GENUINE 55503127.

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

GM GENUINE supplies the 5 Motor Mount parts for the 2026 GMC Sierra 1500.

This group includes GM GENUINE 85623484, GM GENUINE 85623476 and GM GENUINE 85623483 and the remaining parts above.

This table covers the Motor Mount bolts. Read more

This group shows a single part: GM GENUINE 11548893.

This table covers the brackets that mount the Motor Mount. Typical signs include a cracked mount, a rattle, or a bracket that no longer holds alignment. Confirm position in the notes. Many brackets look alike and bolt to different corners. Read more

One part is listed for the 2026 GMC Sierra 1500 — GM GENUINE 85126631.

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

20 Oil parts are listed for the 2026 GMC Sierra 1500, from MOBIL, LIQUI MOLY, VALVOLINE and 2 other brands. ACDELCO 109324 carries the "Popular" badge.

In the Full Synthetic grade, LIQUI MOLY, MOBIL, VALVOLINE and 2 other brands supply 15 parts: full-synthetic oils. A representative part number is ACDELCO 109324.

The High Mileage (>75,000 Miles) section lists 2 options from MOBIL — oils grouped for high-mileage engines. MOBIL 123842 is listed in this group.

3 ungrouped parts are not assigned to a grade, with the same engine-level match.

This table covers the Oil check valves. Read more

One part is listed for the 2026 GMC Sierra 1500 — GM GENUINE 55563957.

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

One part is listed for the 2026 GMC Sierra 1500 — GM GENUINE 40009478.

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 for the 2026 GMC Sierra 1500 come from 2 brands — ACDELCO and DORMAN.

Part numbers include ACDELCO 12670864, ACDELCO 55488933 and DORMAN 66219.

This table covers the harness connectors at the Oil Cooler Line. Typical signs include an intermittent fault that moves when you wiggle the plug, green corrosion, or a melted housing. Match terminal count and keyway, not just color. Many families look identical and will not lock. Read more

This group shows a single part: GM GENUINE 11547061.

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

2 Oil Cooler Seal parts for the 2026 GMC Sierra 1500 come from GM GENUINE.

This group includes GM GENUINE 12729505 and GM GENUINE 55507117.

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

2 Oil Dipstick / Tube Seal parts for the 2026 GMC Sierra 1500 come from GM GENUINE.

This group includes GM GENUINE 24504031 and GM GENUINE 12670252.

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

GM GENUINE supplies both parts for the 2026 GMC Sierra 1500.

Part numbers include GM GENUINE 11602884 and GM GENUINE 24233099.

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

3 Oil Filler Cap parts are listed for the 2026 GMC Sierra 1500, from ACDELCO and MOTORAD.

Part numbers include ACDELCO FC268, ACDELCO FC276 and MOTORAD MO190.

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

This group shows a single part: 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

9 Oil Filter parts are listed for the 2026 GMC Sierra 1500, from WIX, ACDELCO, FVP and 4 other brands. ACDELCO PF66 carries the "Popular" badge.

In the Economy grade, FVP, PRO-TEC and VARIOUS MFR supply 3 parts: the catalog's value-priced group. A representative part number is FVP R0351.

In the High Performance / Heavy Duty grade, MOBIL and WIX supply 2 parts: grouped under the catalog's "High Performance / Heavy Duty" designation — the notes column spells out what sets them apart. A representative part number is MOBIL M1115A.

The Standard Replacement section lists 4 options from ACDELCO, WIX and HASTINGS / BALDWIN — built to original-equipment specification. ACDELCO PF66 is listed in this group.

This group includes ACDELCO PF66, FVP R0351 and PRO-TEC PXL10351 and the remaining parts above.

This table covers the Oil Filter Adapter 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

This group shows a single part: GM GENUINE 12675796.

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

GM GENUINE supplies both parts for the 2026 GMC Sierra 1500.

Listed part numbers: GM GENUINE 11570754 and GM GENUINE 09427695.

This table covers the Oil nozzles. Read more

GM GENUINE supplies both parts for the 2026 GMC Sierra 1500.

This group includes GM GENUINE 12716498 and GM GENUINE 40009357.

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

2 Oil Pan parts for the 2026 GMC Sierra 1500 come from GM GENUINE.

Part numbers include GM GENUINE 12732388 and GM GENUINE 40009800.

This table covers the Oil Pan bolts. Read more

One part is listed for the 2026 GMC Sierra 1500 — GM GENUINE 11548002.

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

GM GENUINE supplies the 4 Oil Pan Gasket parts for the 2026 GMC Sierra 1500.

Listed part numbers: GM GENUINE 12663435, GM GENUINE 55496126 and GM GENUINE 55500219, plus the other parts above.

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

One part is listed for the 2026 GMC Sierra 1500 — GM GENUINE 12740051.

This table covers the Oil Pump bolts. Read more

2 Oil Pump Bolt parts for the 2026 GMC Sierra 1500 come from GM GENUINE.

Part numbers include GM GENUINE 11610074 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

This group shows a single part: 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

One part is listed for the 2026 GMC Sierra 1500 — GM GENUINE 12626252.

This table covers the gaskets that seal the Oil Pump. 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

This group shows a single part: GM GENUINE 55500219.

This table covers the Oil Pump Shaft Guide retainers. Read more

This group shows a single part: GM GENUINE 55496318.

This table covers the Oil Temperature senders. Read more

This group shows a single part: GM GENUINE 55494665.

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

This group shows a single part: GM GENUINE 12744924.

This table covers the Piston Pin retainers. Read more

One part is listed for the 2026 GMC Sierra 1500 — GM GENUINE 01647383.

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

This group shows a single part: GM GENUINE 12693554.

This table covers the Rocker Arm nuts. Read more

This group shows a single part: GM GENUINE 11546449.

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

3 Timing Chain parts for the 2026 GMC Sierra 1500 come from GM GENUINE.

Part numbers include GM GENUINE 12671642, GM GENUINE 55489211 and GM GENUINE 55515943.

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

4 Timing Chain Guide / Damper parts for the 2026 GMC Sierra 1500 come from GM GENUINE.

Listed part numbers: GM GENUINE 55489213, GM GENUINE 55489216 and GM GENUINE 55489219, plus the other parts above.

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

GM GENUINE supplies the 4 Timing Chain Tensioner parts for the 2026 GMC Sierra 1500.

Listed part numbers: GM GENUINE 11515758, GM GENUINE 11548171 and GM GENUINE 55508005, plus the other parts above.

This table covers the Timing covers. Read more

This group shows a single part: GM GENUINE 40009454.

This table covers the Timing Cover bolts. Read more

GM GENUINE supplies both parts for the 2026 GMC Sierra 1500.

Listed part numbers: GM GENUINE 11548002 and GM GENUINE 11547061.

This table covers the seals at the Timing Cover. 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

One part is listed for the 2026 GMC Sierra 1500 — GM GENUINE 12689669.

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

One part is listed for the 2026 GMC Sierra 1500 — GM GENUINE 12725693.

This table covers the Timing gears. Read more

This group shows a single part: GM GENUINE 55489215.

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

5 Turbocharger Coolant Line parts are listed for the 2026 GMC Sierra 1500, from GM GENUINE and SUNSONG.

Listed part numbers: GM GENUINE 12729707, GM GENUINE 12735554 and GM GENUINE 24001091, 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

2 Turbocharger Gasket parts for the 2026 GMC Sierra 1500 come from GM GENUINE.

This group includes GM GENUINE 12687166 and GM GENUINE 55512949.

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

This group shows a single part: GM GENUINE 11609953.

This table covers the Turbocharger nuts. Read more

This group shows a single part: GM GENUINE 11588835.

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

GM GENUINE supplies the 5 Turbocharger Oil Line Gasket / O-Ring parts for the 2026 GMC Sierra 1500.

Listed part numbers: GM GENUINE 12663528, GM GENUINE 12663529 and GM GENUINE 12696999, plus the other parts above.

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

One part is listed for the 2026 GMC Sierra 1500 — GM GENUINE 40009524.

This table covers the Turbocharger Wastegate Solenoid / Actuator 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

This group shows a single part: GM GENUINE 24000473.

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

One part is listed for the 2026 GMC Sierra 1500 — GM GENUINE 12692513.

This table covers the Valve covers. Read more

This group shows a single part: GM GENUINE 12700662.

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

GM GENUINE supplies both parts for the 2026 GMC Sierra 1500.

This group includes GM GENUINE 12663348 and GM GENUINE 55502647.

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

One part is listed for the 2026 GMC Sierra 1500 — GM GENUINE 12663277.

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

This group shows a single part: GM GENUINE 90529533.

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

One part is listed for the 2026 GMC Sierra 1500 — GM GENUINE 12731702.

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

2 Variable Valve Timing (VVT) Solenoid Gasket / Seal parts for the 2026 GMC Sierra 1500 come from GM GENUINE.

Listed part numbers: GM GENUINE 12663572 and GM GENUINE 12698384.

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

5 Variable Valve Timing (VVT) Sprocket parts are listed for the 2026 GMC Sierra 1500, from GM GENUINE and ACDELCO. GM GENUINE 12709014 carries the "Popular" badge.

Listed part numbers: GM GENUINE 12709014, ACDELCO 12706545 and ACDELCO 12691898, plus the other parts above.