P0503 Code - Vehicle Speed Sensor 'A' Intermittent/Erratic/High
Quick Answer
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. Common causes include Faulty Vehicle Speed Sensor, Vehicle speed sensor harness or connectors is open or shorted, Vehicle speed sensor circuit poor electrical connection. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
- What it means
- P0503 indicates Vehicle Speed Sensor 'A' Intermittent/Erratic/High.
- Common causes
- Common causes include Faulty Vehicle Speed Sensor, Vehicle speed sensor harness or connectors is open or shorted, Vehicle speed sensor circuit poor electrical connection.
- Severity
- High - diagnose this code as soon as possible.
- Can I drive?
- Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
Code P0503 Description
What are the Possible Causes of the DTC P0503?
- Faulty Vehicle Speed Sensor
- Vehicle speed sensor harness or connectors is open or shorted
- Vehicle speed sensor circuit poor electrical connection
- Faulty Engine Control Module (ECM)
How to Fix the DTC P0503?
Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.
What is the Cost to Diagnose the Code?
Labor: 1.0
To diagnose the P0503 code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.
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Information for Specific Makes
- P0503 BMW — Vehicle Speed Sensor Signal Plausibility Check
- P0503 Buick — Vehicle Speed Sensor Circuit Intermittent
- P0503 Cadillac — Vehicle Speed Sensor Circuit Intermittent
- P0503 Chevrolet — Vehicle Speed Sensor Circuit Intermittent
- P0503 Ford — Vehicle Speed Sensor 'A' Intermittent
- P0503 GMC — Vehicle Speed Sensor Circuit Intermittent
- P0503 Lexus — Vehicle Speed Sensor 'A' Intermittent / Erratic / High
- P0503 Mercedes-Benz — Vehicle Speed Sensor 'A' Intermittent/Erratic/High
- P0503 MINI — Vehicle Speed Sensor Signal Plausibility Check
- P0503 Pontiac — Vehicle Speed Sensor Circuit Intermittent
- P0503 Saturn — Vehicle Speed Sensor Circuit Intermittent
- P0503 Scion — Vehicle Speed Sensor 'A' Intermittent / Erratic / High
- P0503 Toyota — Vehicle Speed Sensor 'A' Intermittent / Erratic / High
Frequently Asked Questions about P0503 Code
1. What are the common symptoms of OBDII code P0503?
Symptoms may include erratic speedometer readings, stalling at low speeds, harsh shifting, and in some cases, the vehicle may not start.
2. What can cause the OBDII code P0503 to trigger?
The code P0503 is commonly triggered by a faulty vehicle speed sensor, damaged wiring harness, or a poor connection between the sensor and the vehicle's computer.
3. How can I diagnose the cause of OBDII code P0503?
Diagnosing the issue involves checking the vehicle speed sensor's wiring and connector for damage, testing the sensor's output using a multimeter, and verifying the sensor's signal with a scan tool.
4. Can a dirty or faulty wheel speed sensor cause code P0503?
Yes, a malfunctioning or dirty wheel speed sensor can lead to an intermittent or erratic signal that triggers the P0503 code.
5. Is it safe to drive my vehicle with OBDII code P0503?
It is not recommended to drive the vehicle with code P0503 as it can lead to potential safety hazards and affect the vehicle's performance.
6. How can I repair OBDII code P0503?
Repairing the issue involves replacing the faulty vehicle speed sensor, repairing any damaged wiring, and ensuring a proper connection between the sensor and the vehicle's computer.
7. Can a DIY enthusiast fix OBDII code P0503?
Depending on your skill level and access to tools, a DIY enthusiast may be able to address the P0503 code by following step-by-step repair guides or seeking help from automotive forums.
8. Will resetting the OBDII code P0503 make it go away permanently?
Simply resetting the code will not fix the underlying issue causing P0503. It is crucial to diagnose and address the root cause to prevent the code from recurring.
9. How much does it cost to fix OBDII code P0503 at a professional auto repair shop?
The cost of fixing code P0503 can vary depending on the labor rates and the price of the vehicle speed sensor. It is advisable to get multiple quotes from reputable auto repair shops.
10. Can a failing vehicle speed sensor affect other systems in the vehicle?
Yes, a failing vehicle speed sensor can impact other systems such as the transmission, cruise control, and ABS (Anti-lock Braking System) due to inaccurate speed readings.
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