If you own a GM 6.6L Duramax equipped with an LML glow plug system, a reliable glow plug control module (GPCM) is essential for efficient cold starts and overall engine performance. This guide reviews five top-rated aftermarket options designed to fit the LLY/LLY-based Duramax platforms and similar diesel systems. Each selection emphasizes durability, compatibility, and ease of replacement to help you avoid costly shop visits and improve starting reliability. Below you’ll find concise product highlights, images, and key features to compare at a glance.
Summary of chosen products:
| Product | Brand | Compatibility |
|---|---|---|
| GXARTS Glow Plug Control Module 8973796350 | GXARTS | Chevrolet GMC 2500HD/3500HD Duramax 6.6 LLY 2004-2005 |
| Glow Plug Control Module Fit For Silverado/Sierra | Jescarno | Chevrolet Silverado 2500/3500 HD; GMC Sierra 2500/3500 HD; Duramax 6.6 LLY 2004-2005 |
| Dorman 904-920 Glow Plug Control Module | Dorman | Select Ford Models (diesel glow plug control module) |
| Dorman 904-413 Glow Plug Controller | Dorman | Chevrolet / GMC Diesel Applications |
| AdvanEX 904-282 Glow Plug Relay Switch | AdvanEX | Ford E-Series / F-Series Diesel |
GXARTS Glow Plug Control Module 8973796350
This GXARTS module is designed for Chevrolet and GMC heavy-duty trucks with the Duramax 6.6 LLY engine from model years 2004–2005. It emphasizes compatibility with OEM part numbers (8973796350) and aims to deliver dependable glow plug operation that can reduce cold-start lag. Packaging highlights potential cost savings by avoiding frequent visits to a professional shop. The unit’s fitment focus targets the Duramax platform common in HD pickups, making it a practical option for owners seeking a direct replacement with a factory-like feel.
Glow Plug Control Module Fit For Silverado/Sierra 2004-2005
Jescarno’s Glow Plug Control Module is framed as a replacement option for Duramax trucks and similar GM configurations from 2004-2005. The product emphasizes improved response times and stable operation by employing a robust circuit layout and durable materials. It lists compatibility with multiple Silverado and GMC Sierra models, including 2500 HD and 3500 HD variants, with part numbers aligning to 8973796350 and 0000984143 as references. This module aims to restore reliable glow plug performance and minimize start-up delays caused by aging control systems.
Dorman 904-920 Glow Plug Control Module
Dorman’s 904-920 module is presented as an ideal, reliable replacement for diesel glow plug control systems. The description emphasizes restoring original operation and robust durability to endure long-term driving. While the product page covers a breadth of Ford diesel applications, the general characteristics—durable construction, compatibility-focused design, and an emphasis on preventing fatigue-related failures—make it a candidate for cross-platform reliability with Ford Power Stroke engines. For Duramax users, it underscores the importance of choosing a compatible module with correct electrical specifications.
Dorman 904-413 Diesel Glow Plug Controller
The 904-413 model from Dorman positions itself as a reliable replacement for diesel glow plug systems in Chevrolet and GMC diesel trucks. The product highlights its ability to restore power to the glow plug system and deliver dependable operation post-fatigue. Durability is a key feature, with construction designed to withstand common engine bay heat and vibration. This option is contrasted with other units by its focus on restoring factory-like performance through high-quality materials and tested reliability.
AdvanEX Diesel Glow Plug Relay Switch Module
AdvanEX offers a diesel glow plug relay switch designed for Ford E-Series and F-Series Super Duty models across a broad range of years (2000–2010). While targeting Ford platforms, the module emphasizes strict quality control and the use of ABS and metal materials to enhance durability, heat resistance, and wear resistance. It also catalogs multiple part numbers (OE and aftermarket) to help ensure compatibility with various glow plug systems and the overall reliability of the diesel starting circuit in severe conditions.
VORGENS Glow Plug Control Module 904-282
VORGENS presents the 904-282 glow plug relay controller as a replacement for multiple Ford Powerstroke engines within 1999–2010 ranges, including the F-250/F-350/F-450 Super Duty lines and related E-series variants. The description notes multiple OE references (YC3Z-12B533-AA, 904-282, DY-876) and emphasizes compatibility with V8 Powerstroke diesels. Fitment information covers several model years and body types, enabling a wide range of diesel users to identify a proper replacement that preserves starting reliability under cold-weather conditions.
Woosphy Glow Plug Control Unit Replacement
Woosphy’s replacement unit targets GM Silverado and GMC Sierra lines, including 2001–2005 2500/3500 models and 2004–2005 Escalade/Tahoe configurations. Part numbers like 97379635 and 97304030 are cited, along with cross-referenced identifiers such as 1S10615 and 73176951. The listing suggests compatibility with multiple related engine configurations, offering a practical option for owners seeking a direct replacement that aligns with factory characteristics and ensures consistent glow plug operation.
Buying Guide: Key Considerations When Choosing a LML Glow Plug Control Module
- Compatibility and fitment: Confirm the module’s compatibility with your exact truck make, model, year, and engine code (for example, Duramax 6.6 LLY within the 2004–2005 range). Incorrect fit can lead to poor performance or non-operation.
- OE references and part numbers: Look for units listing OE numbers (such as 8973796350, YC3Z-12B533-AA) to improve odds of seamless replacement and integration with existing harnesses and sensors.
- Durability and materials: Prioritize modules built with durable plastics, reliable connectors, and robust circuit layouts designed to withstand engine bay heat, vibration, and long-term use.
- Electrical characteristics: Ensure the module provides appropriate voltage regulation and switching behavior to match your glow plug system’s requirements, preventing misfires or delayed starts.
- Ease of installation: Some modules are designed as plug-and-play replacements, while others may require minor wiring or harness adaptation. Consider whether professional installation is needed.
- Warranty and support: Check for manufacturer warranty coverage and access to customer support in case of compatibility questions or replacement needs.
- Brand reputation and reviews: Compare user feedback across brands (GXARTS, Jescarno, Dorman, AdvanEX, VORGENS, Woosphy) to gauge reliability, customer service, and product consistency over time.
- Price vs. longevity: While price is a factor, evaluating long-term durability and the cost of potential future replacements can be more valuable for a diesel start-up component facing harsh operating conditions.
- Dealer vs. aftermarket: Aftermarket modules offer broader availability and potential savings, but ensure the seller provides clear return policies and technical support if needed.
- Installation safety: Disconnect the vehicle battery before replacement to prevent electrical shorts, and follow vehicle-specific service manuals for any required reprogramming or calibration steps.
Choosing the right glow plug control module involves balancing compatibility, durability, and ease of maintenance. When selecting, prioritize units that match OEM specifications and carry reliable warranties. This approach helps maintain reliable cold starts and reduces the risk of glow-related performance issues in your Duramax-powered vehicle.