AutoCodes – Toyota – P0503 Toyota

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

Quick Answer

Vehicles, which are equipped with ABS (Anti-lock Brake System), detect the vehicle speed using the Skid Control ECU (Brake Actuator Assembly) and speed sensor. 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 Toyota 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.

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Code Popularity 11,058

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Intermediate (2 / 3)

What is this?

Table of contents Created and updated by William Orellana on Sep 01, 2022

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P0503 Toyota Description

Vehicles, which are equipped with ABS (Anti-lock Brake System), detect the vehicle speed using the Skid Control ECU (Brake Actuator Assembly) and speed sensor. The speed sensor monitors the wheel rotation speed and sends a signal to the Skid Control ECU. The Skid Control ECU converts the wheel speed signal into a 4-pulse signal and transmits it to the Engine Control Module (ECM) via the combination meter assembly. The ECM determines the vehicle speed based on the frequency of the pulse signal.
If a malfunction (a rapid change in vehicle speed) in the vehicle speed signal being output from the brake actuator assembly (skid control ECU) is detected while the cruise control is in operation, the ECM determines there to be a momentary interruption or noise and stores a Diagnostic Trouble Code (DTC).

OBDII Code P0503 Toyota - Vehicle Speed Sensor 'A' Intermittent / Erratic / High - AutoCodes.com — P0503 Toyota Code - Vehicle Speed Sensor 'A' Intermittent / Erratic / High

What does this mean?

What are the Possible Causes of the DTC P0503 Toyota?

Faulty Vehicle Speed Sensor
Vehicle speed sensor harness or connectors is open or shorted
Vehicle speed sensor circuit poor electrical connection
Faulty Combination Meter Assembly
Faulty Engine Control Module (ECM)

How to Fix the DTC P0503 Toyota?

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 Toyota 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.

Need more information about the P0503 Toyota code?

Need more information on how to fix the P0503 Toyota code? Get Access to Factory Service Manuals

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Information for Specific Toyota Models

P0503 2006 Toyota Camry — Vehicle Speed Sensor 'A' Intermittent
P0503 2007 Toyota Camry — Vehicle Speed Sensor 'A' Intermittent/Erratic/High
P0503 2008 Toyota Camry — Vehicle Speed Sensor 'A' Intermittent/Erratic/High
P0503 2009 Toyota Camry — Vehicle Speed Sensor 'A' Intermittent/Erratic/High
P0503 2010 Toyota Camry — Vehicle Speed Sensor 'A' Intermittent/Erratic/High
P0503 2011 Toyota Camry — Vehicle Speed Sensor 'A' Intermittent/Erratic/High
P0503 2001 Toyota Highlander — Vehicle Speed Sensor 'A' Intermittent
P0503 2002 Toyota Highlander — Vehicle Speed Sensor 'A' Intermittent
P0503 2003 Toyota Highlander — Vehicle Speed Sensor 'A' Intermittent
P0503 2004 Toyota Highlander — Vehicle Speed Sensor 'A' Intermittent
P0503 2005 Toyota Highlander — Vehicle Speed Sensor 'A' Intermittent
P0503 2006 Toyota Highlander — Vehicle Speed Sensor 'A' Intermittent
P0503 2007 Toyota Highlander — Vehicle Speed Sensor 'A' Intermittent
P0503 2013 Toyota RAV4 — Vehicle Speed Sensor 'A' Intermittent / Erratic / High
P0503 2014 Toyota RAV4 — Vehicle Speed Sensor 'A' Intermittent / Erratic / High
P0503 2015 Toyota RAV4 — Vehicle Speed Sensor 'A' Intermittent / Erratic / High
P0503 2016 Toyota RAV4 — Vehicle Speed Sensor 'A' Intermittent / Erratic / High
P0503 2017 Toyota RAV4 — Vehicle Speed Sensor 'A' Intermittent / Erratic / High
P0503 2018 Toyota RAV4 — Vehicle Speed Sensor 'A' Intermittent / Erratic / High

About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

Frequently Asked Questions about P0503 Toyota Code

1. What are common symptoms of OBDII code P0503 in a Toyota vehicle?

- Common symptoms include erratic or intermittent speedometer operation, cruise control issues, harsh shifting, and the illumination of the Check Engine Light.

2. What does the OBDII code P0503 for a Toyota indicate?

- OBDII code P0503 indicates a malfunction in the Vehicle Speed Sensor 'A,' specifically an intermittent, erratic, or high signal being received by the vehicle's ECM.

3. What are possible causes of OBDII code P0503 in a Toyota?

- Possible causes include a faulty vehicle speed sensor, damaged wiring or connectors in the speed sensor circuit, a malfunctioning ECM, or issues with the speedometer itself.

4. How can I diagnose the cause of OBDII code P0503 in my Toyota?

- Diagnosis typically involves performing a visual inspection of the speed sensor and its wiring, testing the sensor's output using a multimeter, and checking for any related trouble codes in the vehicle's system.

5. Can I continue driving my Toyota with OBDII code P0503 present?

- It is not recommended to continue driving with OBDII code P0503 present, as it can lead to further damage to the vehicle's transmission and other components. It is best to address the issue promptly.

6. How can I repair OBDII code P0503 in my Toyota?

- Repairing OBDII code P0503 usually involves replacing the vehicle speed sensor, repairing any damaged wiring or connectors, and clearing the trouble code using an OBDII scanner.

7. Is it possible to reset the Check Engine Light caused by OBDII code P0503 in a Toyota?

- Yes, the Check Engine Light can be reset using an OBDII scanner after the underlying issue causing OBDII code P0503 has been addressed and repaired.

8. Are there any DIY tips for fixing OBDII code P0503 in a Toyota?

- While some DIY enthusiasts may attempt to replace the vehicle speed sensor themselves, it is recommended to have the issue diagnosed and repaired by a qualified mechanic to ensure proper resolution.

9. Can extreme weather conditions affect the occurrence of OBDII code P0503 in a Toyota?

- Yes, extreme weather conditions such as extreme heat or cold can potentially affect the performance of the vehicle speed sensor and contribute to the occurrence of OBDII code P0503.

10. How long does it typically take to repair OBDII code P0503 in a Toyota at a repair shop?

- The repair time for OBDII code P0503 can vary depending on the exact cause of the issue and the availability of parts, but it usually takes a few hours to complete the diagnosis and repair process at a repair shop.