Standard Ignition SC840 Automatic Transmission Input Shaft Speed Sensor

Automatic Transmission Input Shaft Speed Sensor

Restore accurate transmission speed signal input with this Standard Ignition automatic transmission input shaft speed sensor. The SC840 is a new bolt-on replacement with a 2-wire design, rectangular plug connector, and included wiring harness for a direct service-style installation.

Key Features

• Standard Ignition SC840 automatic transmission input shaft speed sensor
• Bolt-on mounting with one mounting hole and included bolt hardware
• 2-wire sensor with female blade terminals and male rectangular plug connector
• 4-inch (101.6 mm) harness length with wiring harness included
• Black and green finish, new construction
• Mounts on the transmission

Detailed Description

The Standard Ignition SC840 is an automatic transmission input shaft speed sensor built for vehicles that rely on precise transmission speed feedback for shifting and drivability. It uses a bolt-mount attachment method, a single mounting point, and a compact harness layout to match the original service style on supported applications. This part cross-references OE-style numbers such as 24043446 and SN8541 for the same application. Compatible fitment includes Cadillac CT4, Cadillac CT5, Cadillac Escalade, Cadillac Escalade ESV, Cadillac CT6, Chevrolet Silverado 1500, Chevrolet Silverado 1500 LTD, Chevrolet Silverado 2500 HD, Chevrolet Silverado 3500 HD, Chevrolet Tahoe, Chevrolet Camaro, GMC Sierra 1500, GMC Sierra 1500 Limited, GMC Sierra 2500 HD, GMC Sierra 3500 HD, GMC Yukon, and GMC Yukon XL.

Vehicle Fitment

• Fits 2020-2025 Cadillac CT4, Automatic Transmission Input Sensor
• Fits 2020-2025 Cadillac CT5, Automatic Transmission Input Sensor
• Fits 2018-2025 Cadillac Escalade, Automatic Transmission Input Sensor
• Fits 2018-2025 Cadillac Escalade ESV, Automatic Transmission Input Sensor
• Fits 2019-2025 Cadillac CT6, Automatic Transmission Input Sensor
• Fits 2019-2025 Chevrolet Silverado 1500, Automatic Transmission Input Sensor
• Fits 2022 Chevrolet Silverado 1500 LTD, Automatic Transmission Input Sensor
• Fits 2020-2025 Chevrolet Silverado 2500 HD, Automatic Transmission Input Sensor
• Fits 2020-2025 Chevrolet Silverado 3500 HD, Automatic Transmission Input Sensor
• Fits 2018-2025 Chevrolet Tahoe, Automatic Transmission Input Sensor
• Fits 2017-2024 Chevrolet Camaro, Automatic Transmission Input Sensor
• Fits 2019-2025 GMC Sierra 1500, Automatic Transmission Input Sensor
• Fits 2022 GMC Sierra 1500 Limited, Automatic Transmission Input Sensor
• Fits 2020-2025 GMC Sierra 2500 HD, Automatic Transmission Input Sensor
• Fits 2020-2025 GMC Sierra 3500 HD, Automatic Transmission Input Sensor
• Fits 2018-2025 GMC Yukon, Automatic Transmission Input Sensor
• Fits 2018-2025 GMC Yukon XL, Automatic Transmission Input Sensor

Common Symptoms This Sensor Can Address

• Erratic or delayed transmission shift timing
• Transmission speed signal faults stored in the control module
• Harsh, inconsistent, or unstable shifting behavior
• Loss of accurate input shaft speed data to the transmission system
• Check engine light related to transmission sensor performance

Installation Notes and Tips

Install the SC840 on the transmission using the bolt-on mounting point and included bolt hardware. Confirm the connector style, terminal layout, and harness routing before installation, and inspect the mating connector for corrosion or damaged terminals. Because this is an input shaft speed sensor, proper seating and clean electrical contact are important for accurate signal transfer.

Quality Assurance

Standard Ignition supplies replacement electrical and engine management components for service applications, and the SC840 is a new sensor built to match the listed fitment and connection style.