Standard Ignition SC638 Automatic Transmission Input Shaft Speed Sensor

OE-Style Input Shaft Speed Sensor for Chevrolet Spark

Standard Ignition SC638 is an automatic transmission input shaft speed sensor built for direct-fit service on select Chevrolet Spark applications. It uses OE-match connectors and terminals to support proper fit, accurate signal output, and consistent transmission speed readings.

Key Features

• OE-match connectors and terminals for proper electrical fit
• OE-match output signal for accurate transmission speed readings
• 100% environmental, endurance, and end-of-line tested for signal amplitude and polarity
• Precision-manufactured components for stable engine and transmission performance
• Female oval plug-in connector with bolt-mount installation
• 3 male blade terminals for secure connection
• Mounts on the transmission

Detailed Description

Standard Ignition SC638 is an automatic transmission input shaft speed sensor engineered for vehicles that require accurate input speed data for transmission control. The sensor features a female oval plug-in connector, a bolt-mount design, and three male blade terminals to match OE-style electrical and mounting requirements. Standard Ignition SC638 is a direct replacement choice for 2014-2020 Chevrolet Spark and 2021-2022 Chevrolet Spark applications, including 2021-2022 Chevrolet Spark automatic transmission input sensor service. This part cross-references select aftermarket numbers for the same application, including 5S13770 and 74232.

Common Issues It Can Help Resolve

• Erratic or inaccurate transmission input speed readings
• Transmission shifting concerns related to speed signal loss
• Illuminated transmission or powertrain warning lights tied to sensor faults
• Harsh, delayed, or inconsistent shift behavior caused by incorrect input data
• Signal interruption from worn connector or terminal interfaces

Installation Notes and Tips

Install SC638 on the transmission using the OE-style bolt-mount location and verify the connector shape, terminal type, and polarity before final assembly. Confirm vehicle application by year and model, especially for Chevrolet Spark 2014-2022 fitment, and inspect the harness connector for corrosion or terminal damage before replacing the sensor.

Quality Assurance

Standard Ignition subjects this sensor to environmental, endurance, and end-of-line testing to verify signal amplitude and polarity. That testing supports consistent output for transmission control and accurate sensor performance in service.