Keep every cylinder firing cleanly with the ThunderCore PRO Coil Boot Kit (P/N 900-P2038-5), a five-piece set that restores the insulated path between each ignition coil and spark plug. It installs as an OE-replacement, direct-fit set for the 2004-2006 Chevrolet Colorado and GMC Canyon, the 2006 Hummer H3 and Isuzu i-350 (all L5-3.5L), and the 2007 Isuzu i-370 (L5-3.7L).
Restores ignition insulation: replaces worn or cracked boots to maintain proper spark isolation and limit voltage loss.
Complete kit coverage: includes the boots, springs, and insulators needed for full-cylinder service — suited to a tune-up or preventive maintenance.
Coil-on-plug fit: designed to match the factory ignition coils and spark plugs in coil-on-plug (COP) systems.
Heat & chemical resistant: built to withstand under-hood heat and exposure to oil and fuel.
In COP systems the boot provides the high-voltage insulation and secure coil-to-plug contact; over time heat, vibration, and chemical exposure can degrade it, which may lead to arc-through, misfires, or hard starting. If a failed boot is the cause of those symptoms, this kit replaces the boots, springs, and insulators for all five cylinders. Boot and insulator material is plastic; color is black. Mounting hardware is not included — consult the vehicle service information for the correct fasteners and whether they may be reused. Country of origin: United States. Manufacturer part number 900-P2038-5.
This part cross-references / interchanges with the following part numbers:
115001
Frequently Asked Questions
What does this coil boot kit do?
In coil-on-plug systems each boot provides the insulated high-voltage path and secure contact between the ignition coil and the spark plug.
How many boots are in the kit?
It's a five-piece kit that includes the boots, springs, and insulators needed to service all five cylinders on the listed L5 engines.
What vehicles does it fit?
A direct-fit set for the 2004-2006 Chevrolet Colorado and GMC Canyon, 2006 Hummer H3 and Isuzu i-350 (L5-3.5L), and 2007 Isuzu i-370 (L5-3.7L). See the Buyer's Guide.
What are signs a coil boot may need replacing?
Misfires, rough running, or hard starting can be signs of a cracked or degraded boot, but these symptoms have other causes—diagnose the cause before replacing.
Is mounting hardware included?
No. Consult the vehicle service information for the correct fasteners and whether they may be reused.
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WARNING:
These products can expose you to chemicals including lead and phthalates, which are known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to
www.P65Warnings.ca.gov.
