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C1729 Infiniti Code - Vehicle Speed Signal

Quick Answer

The C1729 code for Infiniti vehicles indicates a problem with the vehicle speed signal. Common causes include Faulty vehicle speed sensor, Damaged or corroded wiring connected to the speed sensor, Issues with the vehicle's computer system. 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
C1729 Infiniti indicates Vehicle Speed Signal.
Common causes
Common causes include Faulty vehicle speed sensor, Damaged or corroded wiring connected to the speed sensor, Issues with the vehicle's computer system.
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.
What is this?
Table of contents Created and updated by William Orellana on Sep 06, 2024
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Code C1729 Infiniti Description

The C1729 code for Infiniti vehicles indicates a problem with the vehicle speed signal. This code typically means that the vehicle's onboard computer is not receiving a consistent or accurate signal related to the speed of the vehicle. This can have various implications for the performance of the vehicle, as many systems rely on accurate speed data to operate effectively. The vehicle speed signal is crucial for functions such as the transmission shifting, cruise control operation, and traction control systems.

OBDII Code C1729 Infiniti - Vehicle Speed Signal
C1729 Infiniti Code - Vehicle Speed Signal

Common Causes of C1729 Infiniti

  1. Faulty vehicle speed sensor
  2. Damaged or corroded wiring connected to the speed sensor
  3. Issues with the vehicle's computer system
  4. Poor electrical connections related to the speed signal
  5. Physical damage to the speed sensor due to debris or impact

Symptoms of C1729 Infiniti

  1. Inaccurate speedometer readings
  2. Erratic shifting of the transmission
  3. Cruise control not working properly
  4. ABS or traction control warning lights illuminated on the dashboard
  5. Loss of power or acceleration issues

How to Fix C1729 Infiniti

  1. Diagnose the issue by using a scan tool to read the code and check the vehicle speed sensor for proper functioning.
  2. Inspect the wiring and connections related to the speed sensor for any damage or corrosion.
  3. Replace the vehicle speed sensor if it is found to be faulty.
  4. Repair or replace any damaged wiring or connectors as needed.
  5. Clear the code from the vehicle's computer system and test drive the vehicle to ensure the issue has been resolved.

Cost to Fix C1729 Infiniti

The typical repair costs for addressing a C1729 code in an Infiniti vehicle can vary depending on the specific cause of the issue. On average, the cost for parts such as a new vehicle speed sensor can range from $50 to $150, while labor costs at an auto repair shop can add another $100 to $200. Overall, the total repair cost could range from $150 to $350. It's important to keep in mind that labor rates can vary based on location and the specific shop, so it's advisable to check with local providers for a more accurate estimate.

When is the Code Detected?

The vehicle speed signal is not being detected by the Body Control Module (BCM).

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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 C1729 Infiniti Code

1. What are the common symptoms of OBDII code C1729 in an Infiniti related to the vehicle speed signal?

- Common symptoms include erratic speedometer readings, cruise control malfunctions, and issues with the transmission shifting smoothly.

2. What are the possible causes of OBDII code C1729 indicating a problem with the vehicle speed signal in an Infiniti?

- The code may be triggered by a faulty wheel speed sensor, damaged wiring or connectors, a malfunctioning ABS module, or issues with the vehicle's speedometer.

3. How can I diagnose the root cause of OBDII code C1729 in my Infiniti related to the vehicle speed signal?

- To diagnose the issue, you can use a diagnostic scanner to read the code, check the wheel speed sensor readings, inspect the wiring harness for damage, and test the ABS module functionality.

4. Can a malfunctioning vehicle speed signal affect the overall performance of my Infiniti?

- Yes, a faulty vehicle speed signal can impact various systems in your vehicle, including the transmission, ABS, traction control, and cruise control, leading to performance issues and safety concerns.

5. Is it safe to continue driving my Infiniti with OBDII code C1729 related to the vehicle speed signal?

- It is not recommended to drive your vehicle with this code as it can affect critical functions like speedometer accuracy and transmission operation, potentially compromising your safety on the road.

6. How can I repair OBDII code C1729 indicating a problem with the vehicle speed signal in my Infiniti?

- Depending on the root cause, you may need to replace a faulty wheel speed sensor, repair damaged wiring, reset the ABS module, or recalibrate the vehicle's speedometer to resolve the issue.

7. Can resetting the OBDII code C1729 in my Infiniti fix the problem with the vehicle speed signal?

- Resetting the code may temporarily clear the warning light, but it will not fix the underlying issue causing the code to trigger. Proper diagnosis and repair are necessary to address the problem effectively.

8. Are there any preventive maintenance tips to avoid OBDII code C1729 related to the vehicle speed signal in my Infiniti?

- Regularly inspecting and maintaining your vehicle's wheel speed sensors, wiring harness, and ABS system can help prevent issues leading to this OBDII code and ensure optimal performance.

9. How long does it typically take to repair OBDII code C1729 indicating a problem with the vehicle speed signal in an Infiniti?

- The repair time can vary based on the specific cause of the code, but it may take a few hours to a full day, depending on the complexity of the diagnosis and the repair process involved.

10. Is it necessary to visit a dealership or can I fix OBDII code C1729 related to the vehicle speed signal in my Infiniti myself?

- While some DIY enthusiasts may be able to address simpler causes like a loose connector, complex issues involving sensors or ABS modules may require professional diagnosis and repair at a dealership or reputable auto repair shop.

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