2025 GMC Sierra 1500 Engine Parts

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

7 Camshaft parts are listed for the 2025 GMC Sierra 1500, from GM GENUINE and MELLING.

Listed part numbers: GM GENUINE 12745084, GM GENUINE 12698637 and GM GENUINE 12739839, plus the other parts above.

This table covers the Camshaft bearings. 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

GM GENUINE supplies the 4 Camshaft Bearing parts for the 2025 GMC Sierra 1500.

This group includes GM GENUINE 19260874, GM GENUINE 19260876 and GM GENUINE 12679049 and the remaining parts above.

This table covers the Camshaft bolts. Read more

2 Camshaft Bolt parts for the 2025 GMC Sierra 1500 come from GM GENUINE.

Part numbers include GM GENUINE 55496367 and GM GENUINE 11561455.

This table covers the Camshaft Dowel pins. Read more

One part is listed for the 2025 GMC Sierra 1500 — GM GENUINE 24575061.

This table covers the Camshaft Retainer / Thrust plates. Typical signs include warpage, cracks, or a plate that no longer locates the assembly. Confirm which plate the notes describe — backing plates, clutch plates and strike plates are different parts. Read more

2 Camshaft Retainer / Thrust Plate parts for the 2025 GMC Sierra 1500 come from 2 brands — FEL-PRO and GM GENUINE.

Listed part numbers: FEL-PRO ES73115 and GM GENUINE 12589016.

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

This group shows a single part: GM GENUINE 11546667.

This table covers the connecting rods between each piston and the crankshaft. Read more

GM GENUINE supplies both parts for the 2025 GMC Sierra 1500.

This group includes GM GENUINE 12649190 and GM GENUINE 12714549.

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

GM GENUINE supplies the 3 Connecting Rod Bearing parts for the 2025 GMC Sierra 1500.

Listed part numbers: GM GENUINE 55490523, GM GENUINE 12668160 and GM GENUINE 12735504.

This table covers the Connecting Rod bolts. Read more

2 Connecting Rod Bolt parts for the 2025 GMC Sierra 1500 come from GM GENUINE.

Part numbers include GM GENUINE 11570662 and GM GENUINE 11548432.

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

2 Crankcase Pressure Sensor parts for the 2025 GMC Sierra 1500 come from GM GENUINE.

This group includes GM GENUINE 12743331 and GM GENUINE 12814873.

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

GM GENUINE supplies both parts for the 2025 GMC Sierra 1500.

Listed part numbers: GM GENUINE 40009035 and GM GENUINE 12685650.

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

2 Crankshaft Main Bearing parts for the 2025 GMC Sierra 1500 come from GM GENUINE.

This group includes GM GENUINE 12729654 and GM GENUINE 12729655.

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

GM GENUINE supplies the 3 Crankshaft Main Bearing Cap Bolt parts for the 2025 GMC Sierra 1500.

Part numbers include GM GENUINE 11546565, GM GENUINE 11548076 and GM GENUINE 11548075.

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

6 Crankshaft Seal parts for the 2025 GMC Sierra 1500 come from 2 brands — GM GENUINE and FEL-PRO.

This group includes FEL-PRO TCS46221, GM GENUINE 12693989 and GM GENUINE 55509254 and the remaining parts above.

This table covers the Crankshaft Seal covers. Read more

3 Crankshaft Seal Cover parts are listed for the 2025 GMC Sierra 1500, from GM GENUINE and DORMAN.

Listed part numbers: DORMAN 635786, GM GENUINE 12741554 and GM GENUINE 12705663.

This table covers the gaskets that seal the Crankshaft Seal. 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 2025 GMC Sierra 1500 — GM GENUINE 12627520.

This table covers the kits that disable cylinder deactivation. Read more

This group shows a single part: MELLING MDK700HPT3.

This table covers the Cylinder Deactivation 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 12747732.

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

This group shows a single part: GM GENUINE 12733805.

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

One part is listed for the 2025 GMC Sierra 1500 — GM GENUINE 12570326.

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

GM GENUINE supplies the 5 Cylinder Head Bolt parts for the 2025 GMC Sierra 1500.

Part numbers include GM GENUINE 11603109, GM GENUINE 11547740 and GM GENUINE 11547739, among others listed above.

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

GM GENUINE supplies the 3 Cylinder Head Gasket parts for the 2025 GMC Sierra 1500.

This group includes GM GENUINE 12691233, GM GENUINE 12622325 and GM GENUINE 12688943.

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 2025 GMC Sierra 1500 — GM GENUINE 12700996.

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

3 Cylinder Head Plug parts for the 2025 GMC Sierra 1500 come from GM GENUINE.

Part numbers include GM GENUINE 11570754, GM GENUINE 12691176 and GM GENUINE 24502262.

This table covers the Engine Block drain plugs. Read more

GM GENUINE supplies the 3 Engine Block Drain Plug parts for the 2025 GMC Sierra 1500.

This group includes GM GENUINE 11602951, GM GENUINE 11548315 and GM GENUINE 11546667.

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 covers. Read more

3 Engine Cover parts are listed for the 2025 GMC Sierra 1500, from TECHPRO and VARIOUS MFR. All of them fit every engine offered in the 2025 Sierra 1500.

This group includes TECHPRO GM1228195 and TECHPRO GM1228173 and the remaining parts above.

This table covers the Engine Cover grommets. Read more

4 Engine Cover Grommet parts for the 2025 GMC Sierra 1500 come from GM GENUINE. 1 part fits every engine; the other 3 are engine-specific.

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

2 Engine Cover Retainer / Clip parts for the 2025 GMC Sierra 1500 come from GM GENUINE. 1 part fits every engine; the other 1 is engine-specific.

This group includes GM GENUINE 10121502 and GM GENUINE 11518792.

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

6 Exhaust Valve parts for the 2025 GMC Sierra 1500 come from 3 brands — MELLING, GM GENUINE and SBI.

Part numbers include GM GENUINE 12678745, GM GENUINE 12678746 and MELLING V5846, among others listed above.

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

One part is listed for the 2025 GMC Sierra 1500 — GM GENUINE 12718357.

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

GM GENUINE supplies the 3 Harmonic Balancer parts for the 2025 GMC Sierra 1500.

Part numbers include GM GENUINE 12705813, GM GENUINE 55512109 and GM GENUINE 12680364.

This table covers the Harmonic Balancer bolts. Read more

2 Harmonic Balancer Bolt parts for the 2025 GMC Sierra 1500 come from 2 brands — FEL-PRO and GM GENUINE.

This group includes FEL-PRO 73372 and GM GENUINE 11547372.

This table covers the Intake insulators. Read more

One part is listed for the 2025 GMC Sierra 1500 — 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

4 Intake Manifold parts for the 2025 GMC Sierra 1500 come from GM GENUINE.

Listed part numbers: GM GENUINE 12698870, GM GENUINE 40009521 and GM GENUINE 12748173, plus the other parts above.

This table covers the Intake Manifold bolts. Read more

GM GENUINE supplies the 4 Intake Manifold Bolt parts for the 2025 GMC Sierra 1500.

Listed part numbers: GM GENUINE 11548171, GM GENUINE 11588352 and GM GENUINE 11610472, plus the other parts above.

This table covers the Intake Manifold covers. Read more

One part is listed for the 2025 GMC Sierra 1500 — 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

GM GENUINE supplies the 4 Intake Manifold Gasket parts for the 2025 GMC Sierra 1500.

Listed part numbers: GM GENUINE 12663540, GM GENUINE 55503127 and GM GENUINE 12626354, plus the other parts above.

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

6 Intake Valve parts for the 2025 GMC Sierra 1500 come from 3 brands — MELLING, GM GENUINE and SBI.

Listed part numbers: GM GENUINE 12619825, MELLING V5844 and MELLING V5847, plus the other parts above.

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

15 Motor Mount parts for the 2025 GMC Sierra 1500 come from 4 brands — GM GENUINE, ANCHOR, PIONEER and 1 other brand. The "Popular" part is ANCHOR 3556.

This table covers the Motor Mount bolts. Read more

One part is listed for the 2025 GMC Sierra 1500 — 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

This group shows a single part: GM GENUINE 85126631.

This table covers the Motor Mount kits. Read more

4 Motor Mount Kit parts for the 2025 GMC Sierra 1500 come from ANCHOR.

Part numbers include ANCHOR 300852, ANCHOR 300854 and ANCHOR 300963, among others listed above.

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

40 Oil parts for the 2025 GMC Sierra 1500 come from 6 brands — MOBIL, LIQUI MOLY, VALVOLINE and 3 other brands. The "Popular" part is ACDELCO 109324. They are grouped as Full Synthetic and High Mileage (>75,000 Miles), with Full Synthetic the largest group at 33 parts from LIQUI MOLY, MOBIL, VALVOLINE and 3 other brands.

This table covers the Oil check valves. Read more

This group shows a single part: 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

4 Oil Cooler parts for the 2025 GMC Sierra 1500 come from 3 brands — GM GENUINE, DORMAN and GPD.

This group includes DORMAN 918499, GM GENUINE 12738946 and GM GENUINE 40009478 and the remaining parts above.

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

4 Oil Cooler Gasket parts are listed for the 2025 GMC Sierra 1500, from ACDELCO, DORMAN and GM GENUINE. 1 part fits every engine; the other 3 are engine-specific.

Listed part numbers: ACDELCO 12670864, ACDELCO 55488933 and DORMAN 66219, plus the other parts above.

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 85724972.

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

GM GENUINE supplies both parts for the 2025 GMC Sierra 1500.

Listed part numbers: GM GENUINE 11547061 and GM GENUINE 84240291.

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 both parts for the 2025 GMC Sierra 1500.

This group includes GM GENUINE 12729505 and GM GENUINE 55507117.

This table covers the Oil Dipstick tubes. Read more

This group shows a single part: GM GENUINE 12664925.

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 2025 GMC Sierra 1500. All of them fit every engine offered in the 2025 Sierra 1500.

Listed part numbers: GM GENUINE 24504031 and GM GENUINE 12670252.

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

9 Oil Drain Plug parts for the 2025 GMC Sierra 1500 come from 2 brands — DORMAN and GM GENUINE.

Listed part numbers: DORMAN 090854CD, DORMAN 090854 and DORMAN 65416, 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

One part is listed for the 2025 GMC Sierra 1500 — GM GENUINE 12616850.

This table covers the Oil Drain Plug inserts. Read more

One part is listed for the 2025 GMC Sierra 1500 — GM GENUINE 11503302.

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

5 Oil Filler Cap parts for the 2025 GMC Sierra 1500 come from 3 brands — ACDELCO, DORMAN and MOTORAD.

Part numbers include ACDELCO FC268, ACDELCO FC276 and ACDELCO 12713785, among others listed above.

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 2025 GMC Sierra 1500 — GM GENUINE 24100002.

This table covers the Oil Filler tubes. Read more

This group shows a single part: GM GENUINE 12691785.

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 2025 GMC Sierra 1500 come from 8 brands — ACDELCO, WIX, VARIOUS MFR and 5 other brands. The "Popular" part is ACDELCO UPF66R.

The Economy section lists 7 options from FVP, PRO-TEC, VARIOUS MFR and 1 other brand — the catalog's value-priced group. FRAM FE10575 is listed in this group.

The High Performance / Heavy Duty section lists 5 options from WIX, MOBIL and ACDELCO — grouped under the catalog's "High Performance / Heavy Duty" designation — the notes column spells out what sets them apart. ACDELCO UPF66R 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 PF66.