P0503 OBD-II: Vehicle Speed Sensor "A" Intermittent/Erratic/High
P0503 Severity
Will P0503 go away on its own?
Once the vehicle's onboard system no longer detects the issue, most codes will disappear on their own. If your vehicle still has this code, however, it should be properly diagnosed to avoid a more serious problem.
For a proper diagnosis, RepairPal Certified shops have the equipment, tools, and expertise.
Moderate severity codes might not threaten the vehicle's safety or functionality immediately, but you should still get it diagnosed within a reasonable time frame to keep your car running well.
What causes OBD-II fault code P0503?
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 Does P0503 Code 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.
P0503 Symptoms
- Inaccurate vehicle speed displayed
- Transmission may not shift properly
Common Problems That Trigger the P0503 Code
- Powertrain Control Module (PCM) failure
- Vehicle speed sensor failure
- Wiring issue
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