GM GENUINE PARTS transmission speed sensor 24203876 — input/output replacement with seal, OE-fit for smooth shifts

GM Genuine Parts 24203876 is an OE-grade automatic transmission input/output speed sensor with seal engineered to restore accurate vehicle speed and shift control.

This GM-recommended speed sensor replaces the factory unit that monitors input and output shaft rotation for the transmission or transaxle. Built and validated by GM engineers, the 24203876 sensor includes a sealing component to help maintain proper fitment and protect the connector from contaminants. It’s intended as a direct-fit replacement so you can retain factory performance characteristics without aftermarket uncertainty.

How does this sensor affect transmission performance?

The speed sensor provides rotational data used by the vehicle’s control modules to time shifts, manage torque converter lockup, and regulate speed-dependent systems. If the sensor fails or reads inaccurately, you may notice hard shifts, delayed engagement, or erratic shift points. Installing a correct OE replacement helps the transmission control unit receive reliable input for consistent behavior.

• Transmits input/output shaft speeds to the transmission control unit
• Helps maintain smooth, predictable gear changes
• Reduces risk of improper shift timing caused by faulty readings

Is this a direct-fit part for my GM vehicle?

Yes—GM Genuine Parts are engineered to match the original part’s dimensions, mounting, and electrical connections, minimizing installation adjustments. The 24203876 is offered as a factory-style replacement for specific Chevrolet, Buick, GMC, and Cadillac models. Always verify part compatibility with your VIN or vehicle applications guide before ordering.

• Designed to match original mounting points and connector type
• Includes seal to ensure correct fit and prevent leaks
• Check vehicle fitment using VIN or official parts catalog

What makes this GM Genuine Parts sensor different from aftermarket options?

GM Genuine Parts go through the same development and testing protocols as the original components, so they meet the automaker’s standards for durability and integration. This part preserves factory tolerances and electronics behavior, which can matter for calibration-sensitive systems. Choosing the OEM-style sensor helps avoid surprises that sometimes come with non-OEM designs.

• Engineered and validated by GM for exacting performance
• Updated designs and materials when GM refines production parts
• Backed by General Motors for quality and traceability

How should I prepare for replacement and installation?

Before you begin, gather basic hand tools and consult the vehicle service manual for torque specs and procedures. Depressurize and support the vehicle safely, disconnect the battery if recommended, and handle the new sensor’s connector and seal with care to avoid contamination. If you’re unsure about electrical testing or fluid handling, consider professional installation to ensure correct operation.

• Confirm correct part number (24203876) for your VIN
• Have basic tools, safety support, and a shop manual or repair guide
• Inspect harness and transmission housing for damage before fitting

Who this is for: The GM Genuine Parts 24203876 speed sensor is aimed at owners and technicians who want an OE-quality replacement to restore factory-like transmission behavior. It’s suited for drivers of compatible Chevrolet, Buick, GMC, and Cadillac vehicles, fleet managers prioritizing reliable maintenance, and independent shops needing a tested, GM-backed component that fits without modification.