Standard Ignition SC839 Vehicle Speed Sensor

Vehicle Speed Sensor for GM HD Trucks

Standard Ignition SC839 is a new vehicle speed sensor built for transmission-mounted applications on select Chevrolet Silverado 2500 HD and 3500 HD, as well as GMC Sierra 2500 HD and 3500 HD models. It uses a bolt-on mounting style with a rectangular male plug connector and included wiring harness for a direct replacement approach.

Key Features

• Vehicle speed sensor for transmission-mounted applications
• Bolt-on attachment with one mounting hole and included bolt hardware
• Rectangular male connector with 2-wire, 2-terminal blade design
• 5-inch (127 mm) harness length with wiring harness included
• New replacement part from Standard Ignition
• Cross-reference: 24043905

Detailed Description

Standard Ignition SC839 is engineered as a replacement vehicle speed sensor for GM heavy-duty trucks that rely on accurate transmission speed input. It fits 2020-2024 Chevrolet Silverado 2500 HD, front; 2020-2024 Chevrolet Silverado 3500 HD, front; 2020-2024 GMC Sierra 2500 HD, front; and 2020-2024 GMC Sierra 3500 HD, front. The SC839 part number is also referenced in aftermarket catalogs under SN8540, VSS1373, and VSSA354 for the same application.

With a bolt mount design, one bolt hole, and a rectangular plug connector, this sensor is configured for straightforward transmission installation. The black and brown housing, female blade terminals, and included harness support proper electrical connection in the vehicle speed sensing circuit. Standard Ignition SC839 is a practical choice when replacing a worn or failed sensor on Chevrolet Silverado 2500 HD, Chevrolet Silverado 3500 HD, GMC Sierra 2500 HD, or GMC Sierra 3500 HD trucks.

What It Helps Fix

• Erratic or inaccurate vehicle speed readings
• Speedometer operation problems
• Transmission shift concerns related to speed signal loss
• Diagnostic trouble codes tied to vehicle speed sensor performance
• Intermittent signal issues from a damaged transmission-mounted sensor

Installation Notes and Tips

Install SC839 at the transmission mounting location using the bolt-on design and supplied mounting bolt. Confirm connector shape, terminal style, and harness routing before installation, and inspect the mating connector for corrosion or damaged terminals. Verify the vehicle application against the listed fitment for 2020-2024 Chevrolet Silverado 2500 HD, Chevrolet Silverado 3500 HD, GMC Sierra 2500 HD, and GMC Sierra 3500 HD.

Quality Assurance

Standard Ignition supplies this as a new replacement sensor built to match the listed electrical and mounting specifications for the confirmed GM HD truck applications.