AutoCodes – Lexus – C1543 Lexus

C1543 Lexus 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 Lexus 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.

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Code Popularity 774

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
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Code C1543 Lexus 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 Lexus - Vehicle Speed Signal Malfunction - AutoCodes.com — C1543 Lexus Code - Vehicle Speed Signal Malfunction

What does this mean?

What are the Possible Causes of the DTC C1543 Lexus?

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 Lexus?

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 Lexus 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 Lexus code?

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

Need Help with the Code?

Get the C1543 Lexus 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 Lexus Code

1. What are common symptoms of OBDII code C1543 in a Lexus?

- Common symptoms include erratic speedometer readings, cruise control malfunctions, and the illumination of the Check Engine Light.

2. What causes the OBDII code C1543 in a Lexus indicating a Vehicle Speed Signal Malfunction?

- The code C1543 is often triggered by issues with the vehicle speed sensor, damaged wiring, or a faulty connection in the speed signal circuit.

3. How can I diagnose the OBDII code C1543 in my Lexus?

- You can diagnose the code by using an OBDII scanner to retrieve the specific error code, checking the vehicle speed sensor for proper function, and inspecting the wiring for any damage.

4. Can a Vehicle Speed Signal Malfunction affect the overall performance of my Lexus?

- Yes, a malfunctioning vehicle speed signal can impact the vehicle's performance, especially in systems like ABS, traction control, and transmission operation.

5. What are some DIY repair tips for resolving the OBDII code C1543 in a Lexus?

- DIY repair tips include checking and cleaning the vehicle speed sensor, inspecting the wiring harness for any breaks or corrosion, and ensuring all connections are secure.

6. Is it safe to continue driving my Lexus with the OBDII code C1543 present?

- It is not recommended to drive your Lexus with the code C1543 present, as it can affect the accuracy of speed-related systems and potentially lead to further issues.

7. How much does it typically cost to repair a Vehicle Speed Signal Malfunction in a Lexus?

- The cost of repair can vary depending on the exact cause of the issue, but it may range from $100 to $300 for parts and labor at a repair shop.

8. Can resetting the OBDII code C1543 in my Lexus make it disappear permanently?

- Resetting the code may temporarily clear the Check Engine Light, but if the underlying issue causing the code is not addressed, it is likely to reappear.

9. Will a Vehicle Speed Signal Malfunction in a Lexus affect fuel efficiency?

- While it may not directly impact fuel efficiency, a malfunctioning vehicle speed signal can lead to performance issues that may indirectly affect fuel consumption.

10. How long does it typically take to repair a Vehicle Speed Signal Malfunction in a Lexus?

- The repair time can vary based on the specific cause of the issue, but it usually takes a few hours to diagnose and fix the problem at a professional repair facility.