Motorad 1IC423 Direct Ignition Coil

Direct Ignition Coil for GM Applications

The Motorad 1IC423 direct ignition coil is built for GM vehicles that need consistent spark output and reliable ignition performance. It is engineered to maintain spark voltage duration under demanding operating conditions and high heat.

Compatible with select 2007-2011 Buick Lucerne, 2007-2011 Cadillac DTS, 2007-2010 Cadillac STS, 2007-2009 Cadillac SRX, and 2007-2009 Cadillac XLR applications, this Motorad ignition coil supports OE-style replacement needs for common ignition system service.

Key Features

• Direct ignition coil design for OE-style replacement
• 12 VDC electrical specification
• 4-terminal blade-style connector with female connector and male terminals
• Regular grade construction for standard service applications
• Built to meet or exceed OEM specifications
• Designed for operation in severe heat and demanding engine conditions
• OE replacement part number 1IC423

Detailed Product Overview

The Motorad 1IC423 ignition coil is designed to deliver stable ignition performance by helping maintain spark voltage duration across a wide range of operating conditions. It uses a blade terminal layout with a female connector and male terminals, and it is specified as a 12 VDC direct ignition coil. This makes it a practical replacement choice for drivers servicing ignition concerns on Buick Lucerne, Cadillac DTS, Cadillac STS, Cadillac SRX, and Cadillac XLR models within the listed years.

This part cross-references ACDelco 521857 and D598A for the same application. The Motorad 1IC423 is manufactured to OEM-level specifications at ISO TS16949 facilities, supporting consistent fit and function in ignition system repair.

Common Issues This Part May Address

• Engine misfire caused by weak or inconsistent spark output
• Hard starting related to ignition coil failure
• Rough idle from degraded coil performance
• Loss of power during acceleration due to ignition breakdown
• Heat-related ignition performance problems

Installation Notes and Tips

• Verify the connector style, terminal count, and mounting layout before installation.
• Inspect spark plugs and related ignition components during coil replacement.
• Confirm the vehicle uses an external resistor where required by the ignition system.
• Check for stored diagnostic trouble codes after installation and clear them as needed.
• Use the vehicle-specific service procedure for the listed Buick and Cadillac applications.

Quality Assurance

Motorad designs this ignition coil to meet or exceed OEM specifications and manufactures it in ISO TS16949-certified facilities. The 1IC423 is backed by a limited lifetime warranty.