AutoCodes – Infiniti – P0726 Infiniti

P0726 Infiniti Code - Engine Speed Input Circuit Performance

Quick Answer

The Engine Control Module (ECM) monitors the engine speed through the Crankshaft Position (CKP) sensor with the engine running, and send signal to the Transmission Control Module (TCM). Common causes include Faulty Crankshaft Position (CKP) Sensor, Crankshaft Position (CKP) Sensor harness is open or shorted, Crankshaft Position (CKP) 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: P0726 Infiniti indicates Engine Speed Input Circuit Performance.
Common causes: Common causes include Faulty Crankshaft Position (CKP) Sensor, Crankshaft Position (CKP) Sensor harness is open or shorted, Crankshaft Position (CKP) 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 3,724

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 P0726 Infiniti Description

The Engine Control Module (ECM) monitors the engine speed through the Crankshaft Position (CKP) sensor with the engine running, and send signal to the Transmission Control Module (TCM).

OBDII Code P0726 Infiniti - Engine Speed Input Circuit Performance - AutoCodes.com — P0726 Infiniti Code - Engine Speed Input Circuit Performance

What does this mean?

What are the Possible Causes of the DTC P0726 Infiniti?

Faulty Crankshaft Position (CKP) Sensor
Crankshaft Position (CKP) Sensor harness is open or shorted
Crankshaft Position (CKP) Sensor circuit poor electrical connection
Communication error between the Engine Control Module (ECM) and Transmission Control Module (TCM)

How to Fix the DTC P0726 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 P0726 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 P0726 Infiniti code?

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Need Help with the 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 P0726 Infiniti Code

1. What does the OBDII code P0726 mean on an Infiniti?

P0726 indicates an issue with the engine speed input circuit, meaning the transmission control module (TCM) is receiving an abnormal or invalid signal from the engine RPM sensor.

2. What are the symptoms of the P0726 code in an Infiniti?

Common symptoms include poor acceleration, erratic shifting, transmission hesitation, a check engine light, or the vehicle entering limp mode.

3. What causes the P0726 code to appear on an Infiniti?

Causes can include a faulty engine speed sensor, damaged wiring or connectors in the circuit, a malfunctioning TCM, or, less commonly, a mechanical transmission issue.

4. Can a dirty or damaged engine speed sensor trigger the P0726 code?

Yes, dirt, debris, or physical damage to the engine speed sensor can cause inaccurate or no readings, which may trigger this code.

5. How is the P0726 code diagnosed on an Infiniti?

A technician will use a scan tool to check for stored codes, inspect the engine speed sensor and its wiring, and test the sensor’s signal to ensure proper function.

6. Can I drive my Infiniti with the P0726 code?

It is not recommended to drive for extended periods with this code, as it can lead to further transmission or performance issues.

7. How do I fix the P0726 code on my Infiniti?

Repairs may include replacing the engine speed sensor, repairing or replacing damaged wiring or connectors, or reprogramming/updating the TCM if necessary.

8. How much does it cost to fix the P0726 code on an Infiniti?

Repair costs vary but typically range from $150 to $400, depending on whether the issue is with the sensor, wiring, or TCM.

9. Can a failing TCM cause the P0726 code on an Infiniti?

Yes, a malfunctioning transmission control module can fail to interpret the engine speed signal correctly, causing this code to appear.

10. Will clearing the P0726 code solve the issue?

Clearing the code will only temporarily remove the check engine light; the underlying issue must be diagnosed and repaired to prevent the code from returning.