AutoCodes – Infiniti – P1721 Infiniti

P1721 Infiniti Code - Vehicle Speed Sensor MTR

Quick Answer

The vehicle speed sensor·MTR signal is transmitted from combination meter to Transmission Control Module (TCM) by CAN communication line. 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: P1721 Infiniti indicates Vehicle Speed Sensor MTR.
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 22,898

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 Sep 12, 2019

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 P1721 Infiniti Description

The vehicle speed sensor·MTR signal is transmitted from combination meter to Transmission Control Module (TCM) by CAN communication line. The signal functions as an auxiliary device to the revolution sensor when it is malfunctioning. The TCM will then use the vehicle speed sensor·MTR signal.

OBDII Code P1721 Infiniti - Vehicle Speed Sensor MTR - AutoCodes.com — P1721 Infiniti Code - Vehicle Speed Sensor MTR

What does this mean?

What are the Possible Causes of the DTC P1721 Infiniti?

Faulty Vehicle Speed Sensor
Vehicle Speed Sensor harness is open or shorted
Vehicle Speed Sensor circuit poor electrical connection
Transmission Control Module (TCM) communication

How to Fix the DTC P1721 Infiniti?

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 P1721 Infiniti 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 P1721 Infiniti code?

Need more information on how to fix the P1721 Infiniti code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P1721 Infiniti code diagnosed by a professional: Find a repair shop in your area

Information for Specific Infiniti Models

P1721 2003 Infiniti G35 — Vehicle Speed Sensor MTR
P1721 2004 Infiniti G35 — Vehicle Speed Sensor MTR
P1721 2005 Infiniti G35 — Vehicle Speed Sensor MTR
P1721 2006 Infiniti G35 — Vehicle Speed Sensor MTR

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 P1721 Infiniti Code

1. What is OBDII code P1721 on an Infiniti related to the Vehicle Speed Sensor MTR?

This code indicates a problem with the vehicle speed sensor motor.

2. What are some common symptoms of a P1721 Infiniti code?

Common symptoms include erratic speedometer readings, issues with cruise control, and potential transmission shifting problems.

3. What are some possible causes of the P1721 code in an Infiniti?

Possible causes include a faulty vehicle speed sensor, damaged wiring or connectors, or a malfunctioning speed sensor motor.

4. How can I diagnose the P1721 Infiniti code?

Diagnosis typically involves checking the vehicle speed sensor and its wiring for any visible damage, as well as using a scan tool to monitor sensor readings.

5. What are some repair tips for fixing a P1721 code on an Infiniti?

Repairing the issue may involve replacing the vehicle speed sensor, repairing any damaged wiring, or replacing the speed sensor motor if necessary.

6. Can I drive my Infiniti with a P1721 code?

It is not recommended to drive the vehicle with this code present, as it can lead to inaccurate speed readings and potential transmission issues.

7. Will resetting the OBDII code make the P1721 Infiniti code go away?

Resetting the code may temporarily clear it, but if the underlying issue is not addressed, the code is likely to return.

8. How much does it typically cost to repair a P1721 Infiniti code?

The cost of repairing this code can vary depending on the specific issue, but it may range from $100 to $300 or more, including parts and labor.

9. Can a DIY enthusiast fix a P1721 Infiniti code?

Depending on their skill level, a DIY enthusiast may be able to diagnose and repair this code by following repair guides and using the necessary tools.

10. Is it important to address the P1721 code promptly?

Yes, it is crucial to address this code promptly to ensure the proper functioning of the vehicle's speed-related systems and prevent potential transmission issues.