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P0726 Infiniti Code - Engine Speed Input Circuit Performance

Quick Answer

The P0726 Infiniti code indicates a problem with the engine speed input circuit performance. Common causes include Faulty engine speed sensor, Damaged wiring or connectors in the engine speed sensor circuit, Malfunctioning ECM. 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 engine speed sensor, Damaged wiring or connectors in the engine speed sensor circuit, Malfunctioning ECM.
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 12, 2024
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Code P0726 Infiniti Description

The P0726 Infiniti code indicates a problem with the engine speed input circuit performance. This means that the vehicle's Engine Control Module (ECM) is not receiving the correct signal from the engine speed sensor. The engine speed sensor, also known as the crankshaft position sensor, is responsible for monitoring the engine's speed and position. This information is crucial for the ECM to control the fuel injection, ignition timing, and other engine functions.

OBDII Code P0726 Infiniti - Engine Speed Input Circuit Performance
P0726 Infiniti Code - Engine Speed Input Circuit Performance

Common Causes of P0726 Infiniti

  1. Faulty engine speed sensor
  2. Damaged wiring or connectors in the engine speed sensor circuit
  3. Malfunctioning ECM
  4. Poor electrical connections
  5. Engine speed sensor out of alignment

Symptoms of P0726 Infiniti

  1. Rough engine idle
  2. Engine misfires
  3. Stalling
  4. Loss of power
  5. Engine not starting

How to Fix P0726 Infiniti

  1. Diagnose the issue by performing a comprehensive inspection of the engine speed sensor and its circuit.
  2. Test the engine speed sensor using a multimeter to ensure it is functioning correctly.
  3. Check and repair any damaged wiring or connectors in the engine speed sensor circuit.
  4. Reset the ECM and clear the fault codes.
  5. Test drive the vehicle to ensure the issue has been resolved.

Cost to Fix P0726 Infiniti

The typical repair costs for addressing the P0726 Infiniti code can range from $150 to $400, including parts and labor. However, it's essential to note that the specific diagnosis time and labor rates at auto repair shops can vary based on factors such as location, vehicle make and model, and engine type. It's advisable to check local rates for a more precise estimate.

When is the Code Detected?

The P0726 Codes is triggered when the TCM detected that the calculated engine speed is greater than the RPM's received from ECM.

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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.

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