Check Engine Lamp Driver Module, 1986 Chevy Truck

Replaces Damaged, Missing Or Burned Out Original Check Engine Light Driver Module Located In The Dash Harness Swing Out Hinged Retaining Connector

Note: Replacement For Original GM & AC Delco Number 12020004, Standard Ignition Number RY536, Duralast Number DR139 & Echlin Number GPL300 Used In 1982 Thru 1991 GM Cars And Light Duty Trucks.

This Check Engine Lamp Driver Module is designed for GM vehicles equipped with early electronic engine control systems. The module controls the operation of the instrument panel Check Engine warning lamp, illuminating the indicator when the engine control module (ECM) detects a system fault.

In these systems, the ECM does not drive the dash warning lamp directly. Instead, it sends a signal to the lamp driver module, which then powers the indicator light in the instrument cluster. When the module fails, the Check Engine light may not illuminate during the startup self-test or may fail to operate when a diagnostic trouble code is present, making proper system diagnosis difficult.

This replacement module restores correct operation of the warning lamp circuit so the Check Engine indicator functions as originally intended. Proper operation of the lamp is essential for monitoring the vehicles electronic control system and retrieving diagnostic trouble codes.

Features:

• Controls the instrument panel Check Engine warning lamp
• Restores proper ECM-triggered lamp operation
• Ensures correct diagnostic trouble code indication
• Direct replacement for the original lamp driver module

See our Fitment Table for complete application details.

M&H Part Number: 12020004

$39.00