AutoCodes – Nissan – P0643 2011 Nissan Pathfinder

P0643 2011 Nissan Pathfinder Code - Sensor Power Supply Circuit Short

Quick Answer

The control module has 2 internal 5-volt reference buses called "5-volt reference 1" and"5-volt reference 2". Common causes include Faulty Engine Control Module (ECM), ECM harness is open or shorted, ECM 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: P0643 2011 Nissan Pathfinder indicates Sensor Power Supply Circuit Short.
Common causes: Common causes include Faulty Engine Control Module (ECM), ECM harness is open or shorted, ECM 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 2,195

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 May 01, 2019

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P0643 2011 Nissan Pathfinder Description

The control module has 2 internal 5-volt reference buses called "5-volt reference 1" and"5-volt reference 2". Each reference bus provided 5-volt reference circuit for more than one sensor. Therefore, a fault condition on one 5-volt reference circuit will affect the other 5-volt reference circuits connected to the reference bus. The control module monitors the voltage on the 5-volt reference buses.

OBDII Code P0643 2011 Nissan Pathfinder - Sensor Power Supply Circuit Short - AutoCodes.com — P0643 2011 Nissan Pathfinder Code - Sensor Power Supply Circuit Short

What does this mean?

What are the Possible Causes of the DTC P0643 2011 Nissan Pathfinder?

Faulty Engine Control Module (ECM)
ECM harness is open or shorted
ECM circuit poor electrical connection
Shorted sensor on 5 volt circuit
Accelerator pedal position sensor (APP sensor 1)
Power steering pressure sensor
EVAP control system pressure sensor
Refrigerant pressure sensor

How to Fix the DTC P0643 2011 Nissan Pathfinder?

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 P0643 2011 Nissan Pathfinder 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 P0643 2011 Nissan Pathfinder code?

Need more information on how to fix the P0643 2011 Nissan Pathfinder code? Get Access to Factory Service Manuals

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 P0643 2011 Nissan Pathfinder Code

1. What does OBDII code P0643 mean for my 2011 Nissan Pathfinder?

This code indicates a fault in the Sensor Power Supply Circuit Short.

2. What are the common symptoms of a P0643 code in a 2011 Nissan Pathfinder?

Common symptoms include engine stalling, rough idling, poor acceleration, and illuminated Check Engine Light.

3. What are the possible causes of a Sensor Power Supply Circuit Short in a 2011 Nissan Pathfinder?

Potential causes include damaged wiring, a faulty sensor, a defective power supply circuit, or a malfunctioning Engine Control Module (ECM).

4. How do I diagnose a P0643 code in my 2011 Nissan Pathfinder?

Diagnosis involves using an OBDII scanner to retrieve the code, inspecting the sensor wiring and connections, testing the sensor itself, and checking the power supply circuit for faults.

5. Can I still drive my 2011 Nissan Pathfinder with a P0643 code?

It is not recommended to drive your vehicle with a P0643 code as it can lead to further damage and potential safety hazards.

6. How can I repair a Sensor Power Supply Circuit Short in my 2011 Nissan Pathfinder?

Repairing a P0643 code may involve repairing or replacing damaged wiring, replacing the faulty sensor, repairing the power supply circuit, or reprogramming the ECM.

7. Will resetting the Check Engine Light fix the P0643 code in my 2011 Nissan Pathfinder?

Resetting the Check Engine Light may temporarily clear the code, but it will not fix the underlying issue causing the P0643 code.

8. How much does it cost to repair a P0643 code in a 2011 Nissan Pathfinder?

The cost of repairing a P0643 code can vary depending on the exact cause of the issue, but it may range from $100 to $500 or more.

9. Can I prevent a P0643 code from occurring in my 2011 Nissan Pathfinder?

Regular vehicle maintenance, including checking and replacing sensors as needed, can help prevent the occurrence of a P0643 code.

10. Is it safe to clear a P0643 code and continue driving my 2011 Nissan Pathfinder?

It is not recommended to clear the code without addressing the underlying issue, as it can lead to further problems and potential safety risks while driving.