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Engine-Codes – Generic – C2173

C2173 Code - Vehicle Speed Or Engine Speed Signal Malfunction

Quick Answer

The C2173 diagnostic trouble code (DTC) indicates a malfunction in the vehicle speed or engine speed signal. Common causes include Faulty vehicle speed sensor, Faulty engine speed sensor, Damaged wiring or connectors related to speed sensors. 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
C2173 indicates Vehicle Speed Or Engine Speed Signal Malfunction.
Common causes
Common causes include Faulty vehicle speed sensor, Faulty engine speed sensor, Damaged wiring or connectors related to speed sensors.
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 C2173 Description

The C2173 diagnostic trouble code (DTC) indicates a malfunction in the vehicle speed or engine speed signal. This means that the vehicle's onboard computer system is not receiving the correct signals related to the speed of the vehicle or the engine's revolutions per minute (RPM). This can lead to various issues with the vehicle's performance and overall operation.

OBDII Code C2173 - Vehicle Speed Or Engine Speed Signal Malfunction
C2173 Code - Vehicle Speed Or Engine Speed Signal Malfunction

Common Causes of C2173

  1. Faulty vehicle speed sensor.
  2. Faulty engine speed sensor.
  3. Damaged wiring or connectors related to speed sensors.
  4. Issues with the vehicle's computer system or communication network.
  5. Faulty instrument cluster or gauge cluster.

Symptoms of C2173

  1. Check engine light illuminated on the dashboard.
  2. Inaccurate speedometer readings or erratic speedometer behavior.
  3. Difficulty shifting gears or erratic transmission behavior.
  4. Loss of power or hesitation during acceleration.
  5. Vehicle going into limp mode or reduced performance mode.

How to Fix C2173

  1. Begin by connecting a diagnostic scanner to the vehicle's onboard computer to retrieve the specific trouble codes and pinpoint the issue.
  2. Inspect the vehicle speed sensor and engine speed sensor for any signs of damage or malfunction. Replace if necessary.
  3. Check the wiring harness and connectors for any breaks, corrosion, or loose connections. Repair or replace as needed.
  4. Clear the DTCs from the vehicle's computer system memory and perform a test drive to ensure the issue has been resolved.
  5. If the problem persists, further diagnosis may be required to identify any underlying issues with the vehicle's computer system or other components.

Cost to Fix C2173

The typical repair costs for addressing a vehicle speed or engine speed signal malfunction can vary depending on the specific issue and the make and model of the vehicle. However, a rough estimate for parts and labor could range from $100 to $300. It's important to note that diagnostic time and labor rates at auto repair shops can vary, so it's advisable to check with local shops for a more accurate estimate.

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Code C2173 Information for Specific Makes

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 C2173 Code

1. What are common symptoms of OBDII code C2173 (Vehicle Speed Or Engine Speed Signal Malfunction)?

- Common symptoms include inaccurate speedometer readings, erratic engine speed readings, stalling, and issues with the transmission shifting.

2. What are the possible causes of OBDII code C2173?

- Causes may include faulty vehicle speed sensor, damaged wiring or connectors, issues with the engine control module (ECM), or a malfunctioning speedometer.

3. How can I diagnose the OBDII code C2173?

- Diagnosing the code typically involves using a scan tool to retrieve the code and checking the vehicle speed sensor for proper operation. Inspecting the wiring and connectors for any damage is also recommended.

4. Can a DIYer repair OBDII code C2173 at home?

- Depending on the cause, a DIYer with some mechanical knowledge may be able to repair the issue by replacing the faulty vehicle speed sensor or repairing damaged wiring. However, more complex issues may require professional help.

5. Is it safe to continue driving with OBDII code C2173 present?

- It is not recommended to drive with this code present, as it can lead to inaccurate speed readings and potential safety hazards on the road. It is best to address the issue promptly.

6. How much does it typically cost to repair OBDII code C2173?

- The cost of repairing this code can vary depending on the cause of the issue and whether you choose to repair it yourself or seek professional help. Costs may range from a few dollars for DIY repairs to a few hundred dollars for professional repairs.

7. How long does it take to repair OBDII code C2173?

- The repair time can vary based on the cause of the issue and the complexity of the repair. Simple fixes like replacing a speed sensor may take an hour or two, while more involved repairs could take longer.

8. Can a bad vehicle speed sensor cause other issues besides triggering OBDII code C2173?

- Yes, a faulty vehicle speed sensor can cause various issues such as poor fuel economy, harsh shifting in automatic transmissions, and even problems with the vehicle's cruise control system.

9. Are there any preventative measures to avoid OBDII code C2173 in the future?

- Regular maintenance, including checking and replacing the vehicle speed sensor as recommended by the manufacturer, can help prevent issues that may trigger OBDII code C2173.

10. Will resetting the OBDII code C2173 make it go away permanently?

- Resetting the code may temporarily clear the warning light, but if the underlying issue is not addressed, the code is likely to return. It is crucial to diagnose and repair the root cause of the problem for a permanent solution.

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