When troubleshooting a Chevrolet vehicle, one of the most common codes you may come across is the P0502 code. This code indicates that the Vehicle Speed Sensor (VSS) Circuit is Low Voltage. This code is triggered when the TP sensor angle is more than 3.5%, the engine is running, the system voltage is 8-18V, the engine speed is between 1,500-6,500RPM, the vehicle speed is less than 200km/h (124mph), and the engine torque is between 68-8,192 Nm (50-6,042 lb ft). There are several reasons why this code is triggered, and they are outlined in the related service bulletins. To ensure you are able to diagnose the problem quickly and accurately, it is important to understand the causes and solutions associated with this code.
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Causes and Solutions for P0502 Code
| Causes | Solutions |
|---|---|
| Faulty speed sensor | Replace speed sensor |
| Faulty wiring or connectors | Inspect the wiring and connectors |
| Faulty transmission output speed sensor | Replace the transmission output speed sensor |
| Engine Mechanical problem | Repair or replace engine mechanical components |
Faulty Speed Sensor
The most common cause of the P0502 code is a faulty speed sensor. The speed sensor monitors the vehicle’s speed and notifies the vehicle’s computer when the speed changes. If the speed sensor is faulty or has become damaged, it can cause the P0502 code to be triggered. To resolve this issue, you will need to replace the speed sensor.
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Faulty Wiring or Connectors
Another common cause of the P0502 code is faulty wiring or connectors. If the wiring or connectors have become damaged or corrupted, it can cause the P0502 code to be triggered. To resolve this issue, you will need to inspect the wiring and connectors and make any necessary repairs or replacements.
Faulty Transmission Output Speed Sensor
In some cases, the P0502 code may be triggered by a faulty transmission output speed sensor. If the transmission output speed sensor has become damaged or is not functioning correctly, it can cause the P0502 code to be triggered. To resolve this issue, you will need to replace the transmission output speed sensor.
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Engine Mechanical Problem
Finally, the P0502 code can be triggered by an engine mechanical problem. If there is an issue with one of the engine’s mechanical components, it can cause the P0502 code to be triggered. You will need to repair or replace the faulty components to resolve this issue.
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Conclusion
The Chevrolet P0502 code can be triggered by a number of different issues, including faulty speed sensors, faulty wiring or connectors, faulty transmission output speed sensors, and engine mechanical problems. Understanding the causes and solutions associated with this code is essential to diagnose the problem quickly and accurately. Using the information in this article and following the recommended solutions, you can quickly resolve the issue and get your Chevrolet vehicle back on the road.