Fleece Performance 15-19 GM 2500/3500 (w/Allison Trans) Transmission Input Speed Sensor Pigtail - FPE-HAR-MU-PT-14

The Fleece Performance Transmission Input Speed Sensor Pigtail (FPE-HAR-MU-PT-14) is a purpose-built replacement wiring pigtail designed specifically for 2015–2019 GM 2500 and 3500 trucks equipped with the Allison 1000/2000 Series automatic transmission. If your Duramax-powered heavy-duty truck is throwing transmission-related fault codes or suffering from erratic shift behavior tied to a damaged or corroded input speed sensor connector, this drop-in replacement pigtail from Fleece Performance gives you a clean, reliable repair path without cutting into your truck's factory harness unnecessarily.

Key Features & Benefits

• Direct-Fit Replacement: Engineered specifically for the Allison transmission input speed sensor connector found on 2015–2019 GM 2500/3500 trucks, so you get a plug-and-play repair rather than a generic splice job.
• Heat-Sealable Butt-Style Connectors Included: The kit comes with two heat-sealable butt-style connectors, giving you a weatherproof, vibration-resistant splice that stands up to the harsh underhood and undercarriage environment of a heavy-duty work truck.
• Preserves OEM Harness Integrity: By replacing only the damaged pigtail end rather than splicing into your truck's main wiring harness, you maintain a clean, serviceable repair that is easier to diagnose in the future.
• Trusted Fleece Performance Engineering: Fleece Performance is a well-regarded name in the Duramax and Allison transmission performance and repair space, known for producing components built to the demands of diesel truck owners — both daily drivers and heavy-use work trucks.
• Affordable Repair Solution: At $28.99, this pigtail offers a cost-effective fix compared to dealership harness repair labor or full harness replacement.

Specifications

• Brand: Fleece Performance
• Part Number: FPE-HAR-MU-PT-14
• UPC: 670875719811
• Application: Transmission Input Speed Sensor Pigtail — Allison 1000/2000 Series
• Includes: Replacement pigtail + two (2) heat-sealable butt-style connectors
• Price: $28.99

Fitment

This transmission input speed sensor pigtail fits 2015, 2016, 2017, 2018, and 2019 GM Silverado 2500HD and Sierra 2500HD / Silverado 3500HD and Sierra 3500HD trucks that are equipped with the Allison 1000/2000 Series automatic transmission. The Allison transmission fitment qualifier is critical — this pigtail is not intended for GM 2500/3500 trucks equipped with a different transmission. If you are unsure whether your specific truck came with the Allison transmission, verify your RPO codes in the glove box sticker or contact our fitment team before ordering.

This part is not for 2001–2004 GM Duramax trucks (those applications use a different Fleece Performance NSBU pigtail) or for model years outside the 2015–2019 range.

What's in the Box

• 1x Transmission Input Speed Sensor Pigtail (pre-terminated connector end)
• 2x Heat-sealable butt-style splice connectors

Why Buy from ThreePiece.us

ThreePiece.us stocks this Fleece Performance pigtail as a regularly stocked product — not a special order — so you can get it shipped out quickly when your truck is down. Every order ships free, and if you need to spread out the cost of a larger repair, Affirm financing is available at checkout. Our team has served over 10,000 customers and is available to help you verify fitment before you buy — just reach out via the fitment help button on this page or call us at 813-535-5801. We're here to make sure you get the right part the first time.

Frequently Asked Questions

Does this pigtail fit my 2017 GMC Sierra 2500HD Duramax?

Yes — provided your Sierra 2500HD is equipped with the Allison 1000/2000 Series automatic transmission, this pigtail (FPE-HAR-MU-PT-14) is listed to fit 2015–2019 GM 2500 and 3500 trucks with the Allison trans. If you're unsure whether your truck has the Allison, check your RPO codes or contact our team and we'll help you confirm.

What's included with this pigtail kit?

The kit includes the replacement transmission input speed sensor pigtail and two heat-sealable butt-style connectors for making a clean, weatherproof splice to your existing harness.

Will this work on my 2014 or 2020 GM 2500?

No — the listed fitment for FPE-HAR-MU-PT-14 is specifically 2015–2019 GM 2500/3500 with the Allison transmission. Model years outside that range may use a different connector configuration. Contact our fitment team if you have a different year and we can help identify the correct part.

Does this ship free?

Yes — all orders at ThreePiece.us ship free, including this Fleece Performance pigtail. Affirm financing is also available at checkout if you're bundling this with other repair parts.