NGK 48604 Ignition Coil

NGK HEI Ignition Coil for GM Applications

The NGK HEI Ignition Coil, part number 48604, is built for electronic ignition systems that need stable voltage delivery and dependable spark output. It is a 12-volt coil with a HEI design, 3 blade terminals, and a female connector for direct-fit service on a wide range of GM trucks, SUVs, vans, and performance cars.

NGK’s HEI Ignition Coil line is developed from the brand’s long OE-focused manufacturing background, with testing performed in an ISO 17025 accredited lab to verify durability and operational performance under demanding conditions.

Key Features

• 12-volt ignition coil for electronic ignition systems
• HEI coil design for GM-style distributor applications
• 3-terminal blade connection with female connector
• Oil-filled construction not used
• Built to meet or exceed OE standards for fit and function
• Part number 48604 / NGK U1094

Detailed Product Overview

This NGK ignition coil is intended for vehicles using HEI ignition architecture, including many Chevrolet, GMC, Cadillac, Buick, Pontiac, and Isuzu models from 1996 through 2007. Common search terms for this part include NGK 48604 ignition coil for Chevrolet Silverado 1500, NGK HEI ignition coil for GMC Sierra 1500, and replacement ignition coil for Chevrolet Express 2500 and GMC Savana 2500. The design supports consistent ignition performance across late-model domestic and import applications with broad coverage.

This part cross-references Standard Ignition DR-49 and Delphi CE20003 for the same application.

Vehicle Fitment

• Fits 1996-2007 Chevrolet Express 1500, N/A
• Fits 2007 Chevrolet Silverado 1500 Classic, N/A
• Fits 1996-2007 GMC Savana 1500, N/A
• Fits 2007 GMC Sierra 1500 Classic, N/A
• Fits 1996-2006 Chevrolet Express 2500, N/A
• Fits 1999-2006 Chevrolet Silverado 1500, N/A
• Fits 1996-2006 GMC Savana 2500, N/A
• Fits 1999-2006 GMC Sierra 1500, N/A
• Fits 1996-2005 Chevrolet Astro, N/A
• Fits 1996-2005 Chevrolet Blazer, N/A
• Fits 1996-2005 GMC Jimmy, N/A
• Fits 1996-2005 GMC Safari, N/A
• Fits 1996-2004 Chevrolet S10, N/A
• Fits 1996-2004 GMC Sonoma, N/A
• Fits 1996-2002 Chevrolet Express 3500, N/A
• Fits 1996-2002 GMC Savana 3500, N/A
• Fits 1996-2001 Oldsmobile Bravada, N/A
• Fits 1999-2000 Cadillac Escalade, N/A
• Fits 1996-2000 Chevrolet C2500, N/A
• Fits 1996-2000 Chevrolet C3500, N/A
• Fits 1996-2000 Chevrolet K2500, N/A
• Fits 1996-2000 Chevrolet K3500, N/A
• Fits 1996-2000 Chevrolet Tahoe, N/A
• Fits 1996-2000 GMC C2500, N/A
• Fits 1996-2000 GMC C3500, N/A
• Fits 1996-2000 GMC K2500, N/A
• Fits 1996-2000 GMC K3500, N/A
• Fits 1996-2000 GMC Yukon, N/A
• Fits 1997-2000 Isuzu Hombre, N/A
• Fits 1996-1999 Chevrolet C1500, N/A
• Fits 1996-1999 Chevrolet C1500 Suburban, N/A
• Fits 1996-1999 Chevrolet C2500 Suburban, N/A
• Fits 1996-1999 Chevrolet K1500, N/A
• Fits 1996-1999 Chevrolet K1500 Suburban, N/A
• Fits 1996-1999 Chevrolet K2500 Suburban, N/A
• Fits 1996-1999 Chevrolet P30, N/A
• Fits 1996-1999 GMC C1500, N/A
• Fits 1996-1999 GMC C1500 Suburban, N/A
• Fits 1996-1999 GMC C2500 Suburban, N/A
• Fits 1996-1999 GMC K1500, N/A
• Fits 1996-1999 GMC K1500 Suburban, N/A
• Fits 1996-1999 GMC K2500 Suburban, N/A
• Fits 1996-1999 GMC P3500, N/A
• Fits 1996-1997 Chevrolet Camaro, N/A
• Fits 1996-1997 Pontiac Firebird, N/A
• Fits 1996 Buick Roadmaster, N/A
• Fits 1996 Cadillac Commercial Chassis, N/A
• Fits 1996 Cadillac Fleetwood, N/A
• Fits 1996 Chevrolet Caprice, N/A
• Fits 1996 Chevrolet Corvette, N/A
• Fits 1996 Chevrolet G30, N/A
• Fits 1996 Chevrolet Impala, N/A
• Fits 1996 GMC G3500, N/A

Common Symptoms This Part Can Address

• Weak spark output during acceleration or load changes
• Hard starting caused by ignition coil failure
• Misfire conditions tied to coil breakdown
• Intermittent ignition performance on HEI-equipped vehicles
• Rough idle related to inconsistent coil voltage delivery

Installation Notes and Tips

Verify the connector style, terminal count, and HEI ignition layout before installation. This coil uses a 12-volt electronic ignition setup with blade terminals and a female connector, so matching the original electrical interface is important for proper operation. Confirm vehicle application by year, make, model, and ignition system before replacing the original coil.

Quality Assurance

NGK manufactures this ignition coil to meet or exceed OE standards and validates coil designs in an ISO 17025 accredited test lab. The brand’s long OE and aftermarket experience supports consistent product development for GM trucks, SUVs, vans, and performance applications, including Chevrolet Silverado 1500, GMC Sierra 1500, and Chevrolet Express models. Part number 48604 is also identified as NGK U1094.