CarFactBook owner reference
Gmc Sierra 1500 Sierra 1500 L3B MY2025 US
2025 · Source-backed quick reference for this exact model/chassis code.
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0parts references
0maintenance items
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MakeGmc
ModelSierra 1500
CodeSierra 1500 L3B MY2025 US
Documented years2025
Battery & electrical
12V battery12-volt Absorbed Glass Mat (AGM) battery for the factory Stop/Start system. Match the replacement number on the original battery label; case size and Ah rating are not specified here.
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Smart-key batteryCR2450 lithium or equivalent remote-key battery; install positive side up.
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Fluids & capacities
Coolant capacity11.8 L (12.4 US qt) approximate entire engine cooling system capacity; recheck the level after filling.
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Engine oil capacity5.5 US qt (5.2 L) with an aluminum oil pan, or 6.0 US qt (5.7 L) with a plastic oil pan, with filter; identify the installed pan before filling (GM TechLink MY2025 chart)
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Engine
Engine codeL3B, GM engine RPO (GM TechLink MY2025 chart)
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Engine displacement2.7 L (GM TechLink MY2025 chart)
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Fuel
Fuel tank capacityStandard/short box: 90.8 L (24.0 US gal). Long box: 107.1 L (28.3 US gal). Approximate fuel tank capacities; identify the box and drivetrain before selecting a value.
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Drivetrain & transmission
Powertrain designation2.7 L inline-4 (L4) gasoline; turbocharged; DOHC; SIDI with VVT (GM body builder VIN engine table)
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