P0503
The signal sent by the vehicle speed sensor to ECM is too low
Generic code
Vehicle Speed and Idle Control System
High severity
Moderate repair
Free on OBD DashX
Want real-world data on P0503?
See which problems come with P0503, how often it shows up in other vehicles, and how to fix it — step by step.
- Real-world fix data
- How often it happens
- Step-by-step repairs
What P0503 means
- The fault code P0503 indicates that there is an intermittent, erratic, or high signal from the Vehicle Speed Sensor 'A'. This may cause issues with vehicle speed regulation and drivability.
Possible symptoms
- Intermittent or erratic speedometer readings
- Inaccurate speedometer readings
- Harsh shifting or transmission problems
- Illuminated check engine light
Possible causes
- Faulty or damaged Vehicle Speed Sensor 'A'
- Wiring or connection issues in the circuit
- Malfunctioning instrument cluster
- Failed powertrain control module (PCM)
Related parts
- Vehicle Speed Sensor:
Possible solutions
- Replace the faulty or damaged Vehicle Speed Sensor 'A'
- Check and repair any damaged wiring or connections in the circuit
- Replace the malfunctioning instrument cluster
- Replace the powertrain control module (PCM) if necessary
Free on OBD DashX
P0503 on OBD DashX
Real-world causes, how often this code shows up, and the fix — step by step.
Open P0503 No sign-up needed · available in 10 languagesScan your own car
Read and clear fault codes, live data and service resets with the CaRPM app.