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GM 12681665 Plug

1991-2009 GM

Customer Questions & Expert Answers (2)
12681665 GM Plug Product Photo 1 of 4
  • Part Description
    Plug Assembly - Gasoline Engine Ignition
  • Replaced By
    12681664
  • Replaces
    25162555, 12607234, 25315018, 25162556, 19256067, 89017883
  • Manufacturer
    General Motors
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  • Related Parts
  • Specifications
  • Fitment
  • Q&A
  • Product Specifications

    BrandGenuine GM
    Manufacturer Part Number12681665
    Part DescriptionPlug; Plug Assembly - Gasoline Engine Ignition
    Item Dimensions3.8 x 1.1 x 6.7 inches
    Item Weight1.10 Pounds
    ConditionNew
    Fitment TypeDirect Replacement
    Replaces25162555, 12607234, 25315018, 25162556, 19256067, 89017883
    ManufacturerGeneral Motors
    SKU12681665
    WarrantyThis genuine GM part is guaranteed by GM's factory warranty.
    Shipping & ReturnShipping Policy Return Policy
    Warning: California's Proposition 65
  • Vehicle Fitment

    Year Make Model Engine Important vehicle option details
    2002-2005, 1999-2000 Cadillac Escalade8 Cyl 5.7L1 TON CREW CAB, 1/2 TON, 3/4 TON, 4 DOOR 1/2 TON, CLASSIC 4 DOOR 1/2 TON, CREW CAB 1 TON, EXT 1/2 TON, EXTENDED CAB 1 TON, EXTENDED CAB 6'6" BOX 1/2 TON, EXTENDED CAB 6'6" BOX 3/4 TON, EXTENDED CAB 8' BOX 3/4 TON, K2500 CREW CAB, K3500 CAB CHASSIS 135.5, K3500 CAB CHASSIS 159.9, REGULAR CAB 1 TON, REGULAR CAB 3/4 TON, YUKON/DENALI/ESCALADE
    1996-2005 Chevrolet Astro6 Cyl 4.3LVAN ASTRO
    2005 Chevrolet Avalanche1/2 TON
    1996-2004 Chevrolet Blazer6 Cyl 4.3L2 DOOR, 4 DOOR
    1996-1999 Chevrolet C15006 Cyl 4.3L, 8 Cyl 5.0L, 8 Cyl 5.7LC1500 EXTENDED CAB LONG BOX, C1500 EXTENDED CAB STANDARD BOX, C1500 REGULAR CAB LONG BOX, C1500 REGULAR CAB STANDARD BOX
    1996-2000 Chevrolet C25008 Cyl 5.0L, 8 Cyl 5.7LC2500 CREW CAB, C2500 EXTENDED CAB LONG BOX, C2500 EXTENDED CAB STANDARD BOX, C2500 REGULAR CAB
    1996-2000 Chevrolet C35008 Cyl 5.7LC3500 CAB CHASSIS 135.5, C3500 CAB CHASSIS 159.9, C3500 CAB CHASSIS 183.5, C3500 CREW CAB LONG WHEELBASE, C3500 CREW CAB SHORT WHEELBASE, C3500 EXTENDED CAB, C3500 REGULAR CAB
    1996-2009 Chevrolet Express6 Cyl 4.3L, 8 Cyl 5.0L, 8 Cyl 5.7L1 TON CARGO EXPRESS, 1 TON COMMERCIAL/RECREATIONAL VEHICLE EXPRESS, 1 TON PASSENGER, 1/2 TON CARGO EXPRESS, 1/2 TON PASSENGER EXPRESS, 3/4 TON CARGO EXPRESS, 3/4 TON PASSENGER EXPRESS
    1996-1999 Chevrolet K15006 Cyl 4.3L, 8 Cyl 5.0L, 8 Cyl 5.7LK1500 EXTENDED CAB LONG BOX, K1500 EXTENDED CAB STANDARD BOX, K1500 REGULAR CAB LONG BOX, K1500 REGULAR CAB STANDARD BOX
    1996-2000 Chevrolet K25008 Cyl 5.0L, 8 Cyl 5.7LK2500 CREW CAB, K2500 EXTENDED CAB LONG BOX, K2500 EXTENDED CAB STANDARD BOX, K2500 REGULAR CAB
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  • Customer Questions & Expert Answers

    Q:
    I'm wondering if this is complete and correct part for my vehicle.
    A:
    You can Select Your Vehicle to check if 12681665 fits your vehicle.
    Posted and answered by GM Parts Specialist Julian
    Q:
    What are the important steps to consider when replacing Spark Plugs on Pontiac Grand Prix? Posted by Radley D.
    A:
    When replacing spark plugs it's necessary to take note of the different engine models where the spark plugs are located at. Front side of the engine is where the spark plugs are on both 2.2L and 2.5-liter four-cylinder engines, whereas Quad-4 engines have them under a cover between the camshaft covers. The valleys between the camshafts on 3.4L V6 engines contain spark plugs, with three on each cylinder head. Other V6s have three up front and three in back, necessitating often turning of the engine forward for access purposes. Unbolt upper intake manifold to get to right (rear) spark plugs on 3.4L engines . A variety of tools are needed for spark plug replacement including a spark plug socket, extensions, gap gauge, and plug wire removal tool. A special tool is required for removing heat shields from spark plugs in 3800 V6 engines. Use a torque wrench to tighten down the new plugs and always let the engine cool before working on them.To install or reinstall new ones just thread them in by hand and then use a rubber hose for easy installation without any cross threading.Inspect the plug wires and use a twisting motion to attach them to the new plugs one at a time to avoid mix-ups.
    You can Select Your Vehicle to see complete installation and repair tips.
    Answered by GM Parts Specialist Bob / Mar 25, 2026

Genuine GM Part 12681665, the Right Choice

To ensure reliability, purchase GM part # 12681665 Plug. It is sometimes referred to as GM Spark Plug. Directly from GM, genuine parts are superb with regards to quality, longevity, and fit. Every single part passed stringent quality testing, so you can be sure that it's safe, durable, and built to perform like your original parts. This part fits specific Cadillac Escalade models. It fits Chevrolet Blazer, Silverado, Tahoe. It also fits GMC Sierra, Suburban, Yukon. This also fits Pontiac Grand Prix.

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