P0503 Code - Vehicle Speed Sensor 'A' Intermittent/Erratic/High

What Does P0503 Mean?

OBD-II Code P0503 is defined as a Vehicle Speed Sensor "A" Intermittent/Erratic/High

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 P0503.

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What are the common causes of P0503 ?

The most common cause of this malfunction is related to a faulty vehicle speed sensor. Other causes may include open or shorted wiring or electrical connectors in the vehicle speed sensor circuit, aftermarket or non-OEM size tires and wheels that the PCM is not calibrated to accommodate, faulty hub bearings, a bad reluctor ring, or a faulty PCM (PCM failure is rare).

How do you troubleshoot P0503 ?

There are currently two main types of cylinder deactivation used today, depending on the type of engine. P0503 code for the pushrod design which uses solenoids to alter the oil pressure delivered to the lifters. In their collapsed state, the lifters are unable to elevate their companion pushrods under the valve rocker arms, resulting in valves that cannot be actuated and remain closed.

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