P0502 is a Vehicle speed sensor issue:
P0502 Description
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 ECM. The ECM determines the vehicle speed based on the frequency of these pulse signals. 
Symptoms
- Engine Light ON (or Service Engine Soon Warning Light)
- Speedometer may not work properly
- Transmission shifting problem
Possible Causes
- Vehicle speed sensor harness or connectors is open or shorted
- Vehicle speed sensor
- Combination meter
- Faulty ECM.
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