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Our automotive experts have put together the following information about the P0502 diagnostic trouble code. We've provided the common symptoms that occur when this code is set along with the frequent repairs that address the issues related to the P0502 code.

What Does P0502 Code Mean?

    OBD-II Code P0502 is defined as a Vehicle Speed Sensor "A" Circuit Low

    The Vehicle Speed Sensor tells the engine control module (PCM) how fast the vehicle is going. This information is sent to the speedometer where the road speed is displayed in miles per hour or kilometers per hour. In addition, this information is usually shared with other vehicle systems such as the Transmission, ABS, Traction Control and Power Steering. When the PCM detects an inaccurate or irrational reading, it will set code P0502.

    P0502 Symptoms

    • Inaccurate vehicle speed displayed
    • Transmission may not shift properly

    Common Problems That Trigger the P0502 Code

    • Powertrain Control Module (PCM) failure
    • Vehicle speed sensor failure
    • Wiring issue
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