OBD Code P0503

Vehicle Speed Sensor “A” Intermittent/Erratic/High

What’s mean?

OBD2 Code P0503 Definition:
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

Possible sumptoms of P0503
– Engine Light ON (or Service Engine Soon Warning Light) – Speedometer may not work properly – Transmission shifting problem

Possible Causes

Possible causes of P0503
– Vehicle speed sensor harness or connectors is open or shorted – Vehicle speed sensor – Combination meter – Faulty ECM. The Error code is generally activated on detection of the following conditions: The signal sent by the vehicle speed sensor to ECM is too high or intermittent.

Possible Solutions