AutoCodes – Saturn – P0502 Saturn

P0502 Saturn Code - Vehicle Speed Sensor Circuit Low Input

Quick Answer

The Vehicle Speed Sensor (VSS) assembly provides vehicle speed information to the Powertrain Control Module (PCM). 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 Saturn indicates Vehicle Speed Sensor Circuit 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 13,235

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 Jun 14, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P0502 Saturn Description

The Vehicle Speed Sensor (VSS) assembly provides vehicle speed information to the Powertrain Control Module (PCM). The VSS assembly is a Permanent Magnet (PM) generator. The PM generator produces a pulsing AC voltage as rotor teeth on the transmission output shaft pass through the sensor's magnetic field. The AC voltage level and the number of pulses increase as the speed of the vehicle increases. The PCM converts the pulsing voltage to vehicle speed. The PCM uses the vehicle speed signal to determine shift timing and torque converter clutch (TCC) scheduling.

OBDII Code P0502 Saturn - Vehicle Speed Sensor Circuit Low Input - AutoCodes.com — P0502 Saturn Code - Vehicle Speed Sensor Circuit Low Input

What does this mean?

What are the Possible Causes of the DTC P0502 Saturn?

Faulty Vehicle Speed Sensor
Vehicle speed sensor harness or connectors is open or shorted
Vehicle speed sensor circuit poor electrical connection
Faulty Powertrain Control Module (PCM)

How to Fix the DTC P0502 Saturn?

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 P0502 Saturn 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 P0502 Saturn code?

Need more information on how to fix the P0502 Saturn code? Get Access to Factory Service Manuals

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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 Saturn Code

1. What are common symptoms of OBDII code P0502 in a Saturn related to the Vehicle Speed Sensor Circuit Low Input?

The common symptoms include erratic speedometer readings, cruise control issues, harsh shifting, and the illumination of the Check Engine Light.

2. What are the possible causes of OBDII code P0502 in a Saturn indicating a low input in the Vehicle Speed Sensor Circuit?

The code P0502 can be triggered by a faulty vehicle speed sensor, damaged wiring or connectors in the speed sensor circuit, or a malfunctioning engine control module (ECM).

3. How can I diagnose the cause of OBDII code P0502 in my Saturn for the Vehicle Speed Sensor Circuit Low Input?

You can diagnose the issue by checking the vehicle speed sensor for proper operation, inspecting the wiring and connectors for damage, and using a scan tool to retrieve and analyze the stored fault codes.

4. Is it safe to continue driving a Saturn with OBDII code P0502 indicating a low input in the Vehicle Speed Sensor Circuit?

It is generally safe to drive the vehicle with this code, but it is recommended to address the issue promptly to prevent potential transmission problems and ensure accurate speed readings.

5. Can I repair OBDII code P0502 in my Saturn related to the Vehicle Speed Sensor Circuit Low Input myself?

Depending on your mechanical skills, you may be able to replace the vehicle speed sensor or repair damaged wiring yourself. However, complex diagnoses and ECM-related issues may require professional assistance.

6. What are some tips for repairing OBDII code P0502 in a Saturn with a Vehicle Speed Sensor Circuit Low Input?

Ensure the vehicle is safely supported, use the correct tools for the job, follow a repair manual or online guide, and double-check all connections and components during the repair process.

7. How much does it typically cost to repair OBDII code P0502 in a Saturn indicating a low input in the Vehicle Speed Sensor Circuit?

The cost of repairing this code can vary depending on the specific cause of the issue, but generally, it can range from $100 to $300 for parts and labor.

8. Can a faulty vehicle speed sensor cause other problems besides triggering OBDII code P0502 in a Saturn?

Yes, a faulty vehicle speed sensor can cause issues such as inaccurate speedometer readings, ABS system malfunctions, and erratic shifting behavior in automatic transmissions.

9. How long does it usually take to repair OBDII code P0502 in a Saturn for the Vehicle Speed Sensor Circuit Low Input?

The repair time can vary based on the complexity of the issue and your experience level. On average, it may take anywhere from 1 to 3 hours to diagnose and repair the problem.

10. Is it necessary to reset the OBDII system after repairing code P0502 in a Saturn related to the Vehicle Speed Sensor Circuit Low Input?

Yes, it is recommended to reset the OBDII system after completing the repair to clear the fault code and ensure that the issue has been successfully resolved.