Is a Faulty Transmission Input Speed Sensor Behind Your Truck Troubles?

Could a Faulty Transmission Input Speed Sensor be Causing Your Truck Problems?

Understanding the Role of the Transmission Input Speed Sensor (TSS)

The TSS is a critical component in your truck's transmission system. It monitors the speed of the input shaft, which rotates as the engine runs. The sensor then sends this data to the transmission control module (TCM), allowing for smooth and efficient gear changes.

Common Symptoms of a Faulty TSS

A malfunctioning TSS can disrupt your truck's performance, leading to various driveability issues such as:

• Erratic Shifting: You might experience harsh, delayed, or unexpected gear changes.

• Reduced Fuel Efficiency: A faulty TSS can disrupt the transmission's ability to shift gears optimally, decreasing fuel economy.

• Check Engine Light: The TCM can trigger the check engine light when it detects inconsistent signals from the TSS.

Diagnosing a Potential TSS Issue

Identifying a faulty TSS involves a systematic approach:

1. Visual Inspection: Begin by examining the sensor and its wiring harness for signs of damage, corrosion, or loose connections. Cleaning the connector pins can often resolve minor issues.

2. Testing with a Scanner: Employing a specialized scanner, a qualified technician can measure the sensor's voltage output while the engine is running. Comparing these readings to the manufacturer's specifications helps determine sensor health.

3. Reluctor Wheel Inspection: Examine the reluctor wheel, attached to the transmission input shaft, for any damage or debris that could interfere with the sensor's operation.

Addressing a Faulty TSS

If the diagnosis reveals a faulty TSS, the following repair steps are typically taken:

1. Sensor Replacement: Replacing the faulty sensor with a new one from a reputable manufacturer, like OEM or BorgWarner, ensures proper signal transmission to the TCM. Correct torque specifications are crucial when installing the new sensor.

2. Wiring Repair: If the wiring harness shows signs of damage, repairing or replacing it entirely ensures a stable connection between the sensor and the TCM.

3. Reluctor Wheel Cleaning: Removing debris or foreign objects from the reluctor wheel restores its ability to interact with the sensor correctly.

Don't Let a Faulty TSS Hinder Your Truck's Performance

If you suspect your truck's TSS is malfunctioning, address the issue promptly to restore optimal performance, fuel efficiency, and prevent potential further damage to your transmission.

Visit prebuilttrans.com to learn more about our services or to schedule an appointment or call +1 385-462-8458 for more info! We're dedicated to keeping your pick-up truck running in tip-top shape!

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