Ignition Coil and Iridium Spark Plugs for Cadillac CT6 (2016-2020) 3.6L

Direct-Fit Ignition Coil & Iridium Spark Plug Kit for 2016-2020 Cadillac CT6

Direct-Fit Ignition Overhaul: Replaces deteriorated coil packs and eroded plugs to restore secondary ignition reserve, eliminate misfire codes, and stabilize idle across all six cylinders.

The Stock CT6 High-Voltage Breakdown

The high-compression, direct-injected 3.6L LGX engine subjects factory coil-on-plug assemblies to extreme thermal cycling and severe dielectric stress. Over mileage, factory internal epoxy develops micro-fractures while internal copper windings suffer thermal breakdown. The elevated cylinder pressures of direct injection require higher ionization voltages, causing weak coils to leak voltage to ground, resulting in P0300-P0306 misfire codes, sluggish throttle response, unburnt hydrocarbon build-up, and rough idle conditions.

The Engineering Solution

This complete 6-cylinder ignition kit pairs heavy-duty coil-on-plug units with fine-wire iridium spark plugs. The coils feature high-purity electrolytic copper primary and secondary windings encased in high-temperature thermal epoxy to prevent dielectric punch-through. Direct-fit blade terminals ensure low contact resistance and factory harness retention. Paired with laser-welded iridium spark plugs, this kit reduces firing voltage requirements, enhances flame kernel propagation, and maintains arc stability under high engine loads.

Technical Specifications

Compatibility

• 2016 Cadillac CT6 3.6L V6 (Base, Luxury, Premium Luxury, Platinum)
• 2017 Cadillac CT6 3.6L V6 (Base, Luxury, Premium Luxury, Platinum)
• 2018 Cadillac CT6 3.6L V6 (Base, Luxury, Premium Luxury, Platinum)
• 2019 Cadillac CT6 3.6L V6 (Luxury, Premium Luxury, Sport)
• 2020 Cadillac CT6 3.6L V6 (Luxury, Premium Luxury)

The Cadillac Luxury Calibration Standard

Engineered to meet stringent GM ECU pulse-width modulation and primary resistance specifications, this kit guarantees smooth power delivery, clean cold-starts, and seamless cylinder deactivation operation without triggering check engine lights.