AutoCodes – Nissan – P0643 2009 Nissan Pathfinder

P0643 2009 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 2009 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 2,269

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 2009 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 2009 Nissan Pathfinder - Sensor Power Supply Circuit Short - AutoCodes.com — P0643 2009 Nissan Pathfinder Code - Sensor Power Supply Circuit Short

What does this mean?

What are the Possible Causes of the DTC P0643 2009 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 2009 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 2009 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 2009 Nissan Pathfinder code?

Need more information on how to fix the P0643 2009 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 2009 Nissan Pathfinder Code

1. What are the common symptoms of OBDII code P0643 on a 2009 Nissan Pathfinder?

The common symptoms of OBDII code P0643 on a 2009 Nissan Pathfinder include illuminated Check Engine Light, engine stalling, rough idling, and poor vehicle performance.

2. What does the OBDII code P0643 indicate in a 2009 Nissan Pathfinder?

OBDII code P0643 in a 2009 Nissan Pathfinder indicates a fault in the Sensor Power Supply Circuit Short.

3. What are the possible causes of OBDII code P0643 in a 2009 Nissan Pathfinder?

Possible causes of OBDII code P0643 in a 2009 Nissan Pathfinder include a faulty sensor, damaged wiring or connectors in the power supply circuit, or a malfunctioning Engine Control Module (ECM).

4. How can I diagnose the Sensor Power Supply Circuit Short causing OBDII code P0643 on my 2009 Nissan Pathfinder?

To diagnose the Sensor Power Supply Circuit Short causing OBDII code P0643 on your 2009 Nissan Pathfinder, you can perform a visual inspection of the wiring and connectors, test the sensor's resistance, and use a multimeter to check for voltage irregularities.

5. Is it safe to continue driving my 2009 Nissan Pathfinder with OBDII code P0643?

It is not recommended to continue driving your 2009 Nissan Pathfinder with OBDII code P0643, as it can lead to more severe issues and potential engine damage. It is best to address the problem promptly.

6. Can I repair OBDII code P0643 on my 2009 Nissan Pathfinder myself?

While some DIY enthusiasts may attempt to repair OBDII code P0643 on a 2009 Nissan Pathfinder, it is recommended to seek professional help to accurately diagnose and fix the underlying issue to prevent further damage.

7. How much does it typically cost to repair OBDII code P0643 on a 2009 Nissan Pathfinder?

The cost to repair OBDII code P0643 on a 2009 Nissan Pathfinder can vary depending on the exact cause of the issue, labor costs, and parts needed. It is advisable to get a quote from a trusted mechanic.

8. Will resetting the Check Engine Light resolve OBDII code P0643 on a 2009 Nissan Pathfinder?

Simply resetting the Check Engine Light will not resolve OBDII code P0643 on a 2009 Nissan Pathfinder. The underlying issue causing the fault in the Sensor Power Supply Circuit Short needs to be diagnosed and fixed.

9. Can a faulty sensor be the sole reason for OBDII code P0643 on a 2009 Nissan Pathfinder?

Yes, a faulty sensor can be the sole reason for OBDII code P0643 on a 2009 Nissan Pathfinder. If the sensor is not functioning correctly or has shorted out, it can trigger the code.

10. How long does it take to repair OBDII code P0643 on a 2009 Nissan Pathfinder?

The repair time for OBDII code P0643 on a 2009 Nissan Pathfinder can vary depending on the exact cause of the issue and the complexity of the repair. It is best to consult with a mechanic for a more accurate estimate.