AutoCodes – Isuzu – P0502 Isuzu

P0502 Isuzu Code - Vehicle Speed Sensor 'A' Low Input

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: P0502 Isuzu indicates Vehicle Speed Sensor 'A' Low Input.
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 13,695

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 Apr 09, 2023

Description
Possible Causes
How To Fix
Tech Notes ▶
Cost to Diagnose
FAQs
Comments
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Code P0502 Isuzu Description

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. After this signal is converted into a more precise rectangular waveform by the waveform shaping circuit inside the combination meter, it is then transmitted to the Engine Control Module (ECM). The ECM determines the vehicle speed based on the frequency of these pulse signals.

OBDII Code P0502 Isuzu - Vehicle Speed Sensor 'A' Low Input - AutoCodes.com — P0502 Isuzu Code - Vehicle Speed Sensor 'A' Low Input

What does this mean?

What are the Possible Causes of the DTC P0502 Isuzu?

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 P0502 Isuzu?

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 does this mean?

Code Tech Notes

User Submitted Video

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P0502 Isuzu 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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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 P0502 Isuzu Code

1. What are common symptoms of OBDII code P0502 Isuzu (Vehicle Speed Sensor 'A' Low Input)?

- Common symptoms include erratic speedometer readings, cruise control issues, harsh shifting, and an illuminated check engine light.

2. What are possible causes of OBDII code P0502 Isuzu?

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

3. How can I diagnose the cause of OBDII code P0502 Isuzu?

- Diagnosing the code typically involves checking the vehicle speed sensor for proper operation, inspecting the wiring and connectors for damage, and testing the speedometer for accuracy.

4. Can I drive my vehicle with OBDII code P0502 Isuzu?

- It is generally not recommended to drive with this code as it can lead to inaccurate speed readings and potential transmission issues. It's best to address the problem promptly.

5. How do I repair OBDII code P0502 Isuzu?

- Repairing the code usually involves replacing the faulty vehicle speed sensor, repairing any damaged wiring or connectors, and clearing the trouble codes from the vehicle's system.

6. Are there any DIY tips for fixing OBDII code P0502 Isuzu?

- DIY tips include checking the speed sensor connector for corrosion, ensuring proper installation of the new sensor, and performing a thorough inspection of the wiring harness.

7. Can a malfunctioning vehicle speed sensor cause other issues besides OBDII code P0502 Isuzu?

- Yes, a malfunctioning speed sensor can cause issues such as inaccurate speedometer readings, ABS system malfunctions, and problems with the vehicle's cruise control system.

8. How much does it cost to repair OBDII code P0502 Isuzu at a mechanic?

- The cost of repair can vary depending on the labor rates and parts prices, but on average, it may cost between $150 to $300 to fix this issue at a mechanic.

9. How long does it take to repair OBDII code P0502 Isuzu?

- The repair time can vary based on the mechanic's experience and workload, but typically, fixing this issue can take anywhere from 1 to 2 hours.

10. Can resetting the check engine light resolve OBDII code P0502 Isuzu temporarily?

- Resetting the check engine light may temporarily clear the code, but if the underlying issue with the vehicle speed sensor is not addressed, the code is likely to return.