Ignition Coil & Spark Plug for Hummer H2 H3 H3T (2008-2010) V8 (Round Style)

Direct Replacement Ignition Coil & Spark Plug Set for 2008-2010 Hummer H2, H3

Replaces degrading factory ignition coils and plugs to restore spark energy, resolve misfires, and ensure consistent combustion under heavy engine loads.

The Stock H2 & H3 Ignition Weakness

The stock GM Gen IV V8 ignition coils, particularly on the GMT820 and GMT345 platforms, are highly prone to thermal degradation over extended high-mileage heat cycles. The factory epoxy inside the OEM round-style coil breaks down over time, leading to internal short-circuiting and increased primary resistance. As the coil's internal resistance builds, overall spark output significantly drops. This lack of voltage results in rough idling, severe under-load misfires, and delayed throttle response—especially noticeable when towing or navigating low-speed off-road obstacles where engine bay airflow is limited and heat soak is severe.

The Engineering Solution

This comprehensive ignition overhaul kit directly addresses factory thermal vulnerabilities. The included UF414 / D514A round-style coils are constructed with a high-grade thermal epoxy core and enhanced copper internal windings to effectively manage and dissipate intense engine bay temperatures. Delivering a maximum output of 32,000 volts with a 20% measurable increase in spark energy over standard OE units, this plug-and-play assembly maximizes combustion efficiency. The set also includes premium silicone spark plug wires (748UU) and matched spark plugs (41962), ensuring a seamless, high-amperage transfer of voltage that stabilizes power output and eliminates hesitation across the entire RPM range. Note: Always ensure you are replacing round-style coils (not square) prior to installation.

Technical Specifications

Compatibility

• Cadillac Escalade (V8 with Round Coils)
• Chevrolet Avalanche (V8 with Round Coils)
• Chevrolet Express (V8 with Round Coils)
• Chevrolet Silverado (V8 with Round Coils)
• Chevrolet Suburban (V8 with Round Coils)
• Chevrolet Tahoe (V8 with Round Coils)
• Chevrolet Trailblazer (V8 with Round Coils)
• GMC Savana (V8 with Round Coils)
• GMC Yukon (V8 with Round Coils)
• Hummer H2 (2008-2009 V8 with Round Coils)
• Hummer H3 / H3T (2008-2010 V8 with Round Coils)
• Interchanges with OE Parts: C1512, D514A, UF414, 5C1555, E894, 52-1820, IC534, 12573190, 12570616, 12611424, 1788407, GN10165

The Hummer Off-Road Caliber

Designed to withstand the harsh vibrations and extreme conditions of off-road operation, this ignition coil kit ensures robust 4x4 reliability, delivering a consistently clean burn to eliminate annoying CELs and keep your Hummer performing at its peak on any terrain.