The Subaru P0502 code is a common diagnostic trouble code (DTC) that is associated with a vehicle’s speed sensor. If a Subaru is experiencing poor driveability, it is likely that the P0502 code is present. Although the code can indicate a variety of potential problems, the most common causes are poor contact, a faulty harness between the ECM and TCM connector, or a faulty harness between the VSS and ECM connector. In order to properly diagnose and repair this issue, it is important to understand the potential causes and corresponding solutions for the Subaru P0502 code.
Causes and Solutions for Subaru P0502 Code
| Causes | Solutions |
|---|---|
| Check to be sure vehicle is equipped with automatic transaxle | Replace with appropriate transmission type |
| Check poor contact | Clean and inspect wiring connectors for corrosion |
| Check harness between ECM and TCM connector | Replace faulty connector if necessary |
| Check harness between VSS and ECM connector | Replace faulty connector if necessary |
Verifying the Vehicle is Equipped with Automatic Transaxle
When a Subaru is experiencing poor driveability, it is important to first verify that the vehicle is equipped with an automatic transaxle. If the vehicle is not equipped with the correct transmission type, it is likely that a P0502 code will be stored in the ECU. In this case, the issue can be easily remedied by replacing the transmission with the appropriate type.
Checking Poor Contact and Corrosion
If the vehicle is equipped with the correct transmission type, the next step is to check for poor contact between the wiring harnesses and the ECU. It is important to inspect the wiring connectors for corrosion, as this can create an intermittent connection. If any corrosion is present, the connectors should be cleaned and re-inspected.
Replacing Faulty Connectors
If the inspection does not reveal any obvious issues, the next step is to check the harnesses between the ECM and TCM connectors, as well as the VSS and ECM connectors. If any of these connectors are faulty, they should be replaced with a new one.
Conclusion
In conclusion, the Subaru P0502 code is a common diagnostic trouble code that is associated with a vehicle’s speed sensor. The most common causes of this code are poor contact, a faulty harness between the ECM and TCM connector, or a faulty harness between the VSS and ECM connector. In order to properly diagnose and repair this issue, it is important to understand the potential causes and corresponding solutions for the Subaru P0502 Code. Taking these steps can help to ensure a successful repair and improved driveability.
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