AutoCodes – Scion – C1543 Scion

C1543 Scion Code - Vehicle Speed Signal Malfunction

Quick Answer

The Power Steering ECU receives vehicle speed signals from the Skid Control ECU via CAN communication. Common causes include Faulty Vehicle Speed Sensor, Vehicle Speed Sensor harness 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: C1543 Scion indicates Vehicle Speed Signal Malfunction.
Common causes: Common causes include Faulty Vehicle Speed Sensor, Vehicle Speed Sensor harness 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.

Save to My Repairs My Repairs

AI answers can be wrong. Verify repairs with testing. Open full chat

Code Popularity 1,368

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on Nov 05, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
Add Comment

💬 Need more help? Ask Coddy for instant answers — it's free!

Code C1543 Scion Description

The Power Steering ECU receives vehicle speed signals from the Skid Control ECU via CAN communication. The ECU provides appropriate assisting force in accordance with the vehicle speed, based on the signals. If the ECU detects this Diagnostic Trouble Code (DTC), it adjusts the amount of power assistance for a speed of 100 km/h (62 mph) and continues the system control. The Power Steering ECU monitors the Vehicle Speed Signal. The Power Steering ECU sets the OBDII code when the Vehicle Speed Signal is not to factory specifications.

OBDII Code C1543 Scion - Vehicle Speed Signal Malfunction - AutoCodes.com — C1543 Scion Code - Vehicle Speed Signal Malfunction

What does this mean?

What are the Possible Causes of the DTC C1543 Scion?

Faulty Vehicle Speed Sensor
Vehicle Speed Sensor harness is open or shorted
Vehicle Speed Sensor circuit poor electrical connection
Faulty Skid Control ECU
Faulty Power Steering ECU

How to Fix the DTC C1543 Scion?

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 C1543 Scion 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 C1543 Scion code?

Need more information on how to fix the C1543 Scion code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the C1543 Scion code diagnosed by a professional: Find a repair shop in your area

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 C1543 Scion Code

What does the OBDII code C1543 indicate?

The OBDII code C1543 for Scion indicates a "Vehicle Speed Signal Malfunction," meaning the vehicle's computer is not receiving the correct speed signal from the speed sensor.

What are common symptoms of the C1543 code?

Common symptoms include erratic speedometer readings, the check engine light being illuminated, and potential issues with automatic transmission shifting or cruise control not functioning properly.

What could cause the C1543 code to trigger?

Causes may include a faulty vehicle speed sensor, damaged wiring or connectors in the speed sensor circuit, or issues with the engine control unit (ECU).

How can I diagnose the C1543 code?

To diagnose C1543, use an OBDII scanner to confirm the code, inspect the vehicle speed sensor and its wiring for damage, and check for any other related codes that might provide additional context.

Is it safe to drive with the C1543 code?

While it may be possible to drive the vehicle, it is not recommended as the malfunction can impact vehicle performance and safety, particularly in terms of speed regulation and transmission operation.

What are some repair tips for fixing the C1543 code?

Repair tips include checking and repairing any damaged wiring or connectors, replacing a faulty vehicle speed sensor, and ensuring that the ECU is functioning correctly.

How much does it typically cost to fix the C1543 code?

Repair costs can vary widely based on the specific issue; replacing a speed sensor typically ranges from $100 to $300, including parts and labor.

Can I clear the C1543 code without fixing the issue?

Yes, you can clear the code using an OBDII scanner, but the underlying issue will remain unresolved, and the code will likely reappear if the problem is not fixed.

What should I do if the C1543 code keeps coming back after repairs?

If the code persists, you should revisit the wiring and connections, check for other related issues, or consult a professional mechanic for a more in-depth diagnosis.