AutoCodes – Mitsubishi – P0721 Mitsubishi

P0721 Mitsubishi Code - Output Speed Sensor Performance

Quick Answer

The speed sensor detects the revolution of the idler gear parking pawl lock gear and emits a pulse signal. Common causes include Faulty Speed Sensor, Speed Sensor harness is open or shorted, 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: P0721 Mitsubishi indicates Output Speed Sensor Performance.
Common causes: Common causes include Faulty Speed Sensor, Speed Sensor harness is open or shorted, 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 3,704

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 Jun 14, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P0721 Mitsubishi Description

The speed sensor detects the revolution of the idler gear parking pawl lock gear and emits a pulse signal. The pulse signal is sent to the Transmission Control Module (TCM) which converts it into vehicle speed.

OBDII Code P0721 Mitsubishi - Output Speed Sensor Performance - AutoCodes.com — P0721 Mitsubishi Code - Output Speed Sensor Performance

What does this mean?

What are the Possible Causes of the DTC P0721 Mitsubishi?

Faulty Speed Sensor
Speed Sensor harness is open or shorted
Speed Sensor circuit poor electrical connection

How to Fix the DTC P0721 Mitsubishi?

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 P0721 Mitsubishi 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 P0721 Mitsubishi code?

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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 P0721 Mitsubishi Code

1. What does the OBDII code P0721 mean on a Mitsubishi?

P0721 indicates an issue with the output speed sensor's performance, meaning the sensor's data doesn't correlate properly with the vehicle's operation.

2. What are the common symptoms of code P0721 in a Mitsubishi?

Common symptoms include erratic or delayed shifting, harsh gear changes, the speedometer not working, and the check engine light being illuminated.

3. What causes the P0721 code to appear in a Mitsubishi?

Causes include a faulty output speed sensor, damaged wiring or connectors, transmission fluid issues, or a problem with the transmission control module.

4. Can I drive my Mitsubishi with a P0721 code?

Driving with a P0721 code is not recommended, as it can lead to transmission issues, poor drivability, and potential safety concerns.

5. How do I diagnose code P0721 in a Mitsubishi?

Diagnosis involves scanning for codes, inspecting the output speed sensor and its wiring, checking transmission fluid levels, and testing the sensor's signal with a multimeter.

6. How do I fix the P0721 code on my Mitsubishi?

Repairs may include replacing the output speed sensor, repairing damaged wiring, cleaning or replacing corroded connectors, or addressing transmission fluid problems.

7. Where is the output speed sensor located on a Mitsubishi?

The output speed sensor is typically found on the transmission housing, near the output shaft.

8. What tools are needed to fix a P0721 code on a Mitsubishi?

You may need an OBDII scanner, a multimeter, basic hand tools, and potentially replacement parts like a new output speed sensor.

9. Can a low transmission fluid level cause a P0721 code?

Yes, low or dirty transmission fluid can affect sensor performance and trigger the P0721 code.

10. How much does it cost to repair a P0721 code on a Mitsubishi?

The repair cost varies but generally ranges from $100 to $300 for sensor replacement, with additional costs if wiring or fluid issues need addressing.