Alliant Power AP63728 LML / L5P Duramax 4-Pack Injector Pigtail Harness

Restore reliable electrical connections to your Duramax fuel injectors with the Alliant Power AP63728 4-Pack Injector Pigtail Harness. This OEM-quality repair kit is a direct-fit solution for the factory injector connectors that commonly fail on both LML (2011–2016) and L5P (2017–2024) 6.6L Duramax engines.

Why These Pigtails Matter

The injector connectors on LML and L5P Duramax engines are a well-known failure point. Heat, vibration, and moisture cause increased resistance over time, leading to injector circuit codes (P0201–P0208), random misfires, rough running, and reduced performance. Replacing just the short pigtail section is far more cost-effective than replacing the entire engine wiring harness.

Key Features & Benefits

• OEM-quality construction — Built to meet or exceed GM specifications
• USA assembled in an ISO 9001:2015 certified facility
• Direct replacement for GM OE# 19368140 (also references 19299882)
• 4-pack services one full bank of injectors (use two kits for all 8 cylinders)
• Helps eliminate common injector-related trouble codes
• Cost-effective repair that avoids expensive full-harness replacement
• Ready-to-splice design with proper wire length for clean installations

Vehicle Compatibility

• 2011–2016 Chevrolet Silverado / GMC Sierra 2500HD/3500HD LML 6.6L Duramax
• 2017–2024 Chevrolet Silverado / GMC Sierra 2500HD/3500HD L5P 6.6L Duramax

What's Included

• (4) Injector pigtail harnesses with connectors

Cross References

• GM: 19368140, 19299882
• Fleece: FPE-HAR-L5P-INJ-PT (and 4P/8P versions)