Gledewen Dual Knock Sensor Kit for GM LS 4.8/5.3/6.0L — Wiring Harness & Intake Gaskets

Gledewen's kit supplies two OE-style knock sensors, a reinforced wiring harness, and two intake manifold gasket sets engineered to restore proper knock detection and a sealed intake on GM 4.8L, 5.3L and 6.0L engines.

This full replacement package is built for GM trucks and SUVs from the late 1990s through the mid-2000s — including Chevy Silverado, Tahoe, Avalanche, GMC Sierra, Yukon, Cadillac and Hummer models that use the LS family engines. The kit combines corrosion-resistant electrical terminals and durable rubber gaskets so you get reliable electrical signals to the engine control module and a long-lasting intake seal in one service job. It replaces multiple OE part numbers and comes with a harness to simplify installation when both sensors or the wiring show wear.

How will these knock sensors improve engine performance?

Knock sensors detect abnormal combustion events. Fresh, properly functioning sensors give the engine control unit accurate inputs so ignition timing can be adjusted to avoid detonation and preserve drivability. Worn or intermittent sensors can cause poor fuel/ignition behavior and diagnostic trouble codes.

• Two sensors included to replace both cylinder-bank detectors simultaneously
• Tin-plated and solid brass terminals for consistent conductivity
• 100% accelerometer vibration-tested for durability under road and engine stresses
• Compatible with many OE numbers so it fits direct-replacement procedures

What does the wiring harness add to a simple sensor swap?

The included knock sensor harness replaces old, brittle or corroded connectors that often cause intermittent signals. Installing a new harness restores secure connections, reduces the chance of false codes, and often cuts labor by avoiding splicing or chasing hard-to-reach factory plugs.

• Pre-assembled harness matches factory routing and plug types
• Robust terminals resist corrosion for longer electrical reliability
• Saves time versus repairing damaged factory wiring in tight engine bays

Do the intake manifold gaskets in the kit meet repair needs?

The intake manifold gasket sets are molded from high-quality rubber designed to hold a durable seal between the manifold and cylinder heads. Replacing gaskets at the same time as knock sensors is common when removing components, helping prevent vacuum leaks and restoring engine vacuum stability.

• Two gasket sets included for both intake sealing surfaces
• High-grade rubber resists oil and coolant exposure in typical engine environments
• Helps eliminate vacuum leaks that can cause rough idle or drivability issues

Which vehicles and OE numbers does this kit cover?

This Gledewen kit targets GM LS-family engines used across numerous full-size trucks and SUVs. It is a fit-for-purpose replacement for many factory part numbers, making it suitable for widespread model applications and straightforward cross-referencing during parts selection.

• Fits 4.8L, 5.3L and 6.0L engines in 1999–2007 GM trucks and SUVs
• Commonly replaces 12601822, 12589867, 89060413, 213-3521 and several OEM equivalents
• Applications include Chevrolet Silverado, Tahoe, Avalanche, Suburban; GMC Sierra, Yukon; Cadillac, Hummer and more

Who this is for: technicians, DIY mechanics, and fleet owners who prefer an all-in-one repair solution when addressing knock sensor faults and intake leaks on older GM LS-series engines. Choose this kit if you want matched sensors, a fresh harness to avoid electrical headaches, and new intake gaskets so both detection and sealing systems are restored in one service interval. The package includes two knock sensors, a dedicated harness, two intake manifold gasket sets, and a 12-month warranty to support replacement or refund if defects arise.