P0502 - Vehicle Speed Sensor 'A' Low Input

Repair Importance Level: 3/3
Repair Difficulty Level: 2/3  What does this mean?

P0502 Possible Causes

  • Faulty Vehicle Speed Sensor
  • Vehicle speed sensor harness or connectors is open or shorted
  • Vehicle speed sensor circuit poor electrical connection
  • Faulty Engine Control Module (ECM)

How do I fix code P0502

    Check the "Possible Causes" listed above. Visually inspect the related wiring harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector's pins.

Cost of diagnosing the P0502 code

    Labor: 1.0

    The cost of diagnosing the P0502 code is 1.0 hour of labor. The auto repair labor rates vary widely across the country, and even within the same city. Most auto repairs shops charge between $75 and $150 per hour.

When is the P0502 code detected?

The signal sent by the vehicle speed sensor to ECM is too low.

P0502 Possible Symptoms

  • Engine Light ON (or Service Engine Soon Warning Light)
  • Speedometer may not work properly
  • Transmission shifting problem

P0502 Meaning

The vehicle speed sensor outputs a 4 pulse signal for every revolution of the rotor shaft, which is rotated by the transmission output shaft via the driven gear. After this signal is converted into a more precise rectangular waveform by the waveform shaping circuit inside the combination meter, it is then transmitted to the Engine Control Module (ECM). The ECM determines the vehicle speed based on the frequency of these pulse signals.
OBDII Code P0502 - Vehicle Speed Sensor 'A' Low Input - Engine-Codes.com

P0502 More Information

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P0502 Information for specific makes

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