AutoCodes – Nissan – P0643 2008 Nissan Pathfinder

P0643 2008 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 2008 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 3,475

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 2008 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 2008 Nissan Pathfinder - Sensor Power Supply Circuit Short - AutoCodes.com — P0643 2008 Nissan Pathfinder Code - Sensor Power Supply Circuit Short

What does this mean?

What are the Possible Causes of the DTC P0643 2008 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 2008 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 2008 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 2008 Nissan Pathfinder code?

Need more information on how to fix the P0643 2008 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 2008 Nissan Pathfinder Code

1. What is OBDII code P0643 for a 2008 Nissan Pathfinder?

Code P0643 indicates a potential issue with the Sensor Power Supply Circuit Short in the vehicle.

2. What are the common symptoms of a Sensor Power Supply Circuit Short (P0643) in a 2008 Nissan Pathfinder?

Common symptoms include the check engine light turning on, rough engine performance, stalling, and potential loss of power.

3. What are possible causes of the Sensor Power Supply Circuit Short (P0643) in a 2008 Nissan Pathfinder?

Potential causes include damaged wiring or connectors in the sensor power supply circuit, a faulty sensor, or issues with the engine control module (ECM).

4. How can I diagnose the Sensor Power Supply Circuit Short (P0643) in my 2008 Nissan Pathfinder?

Diagnosing this issue typically involves using a scan tool to read the fault code, checking the sensor and related wiring for damage, and testing the power supply circuit for proper voltage.

5. Can I continue driving my 2008 Nissan Pathfinder with the P0643 code present?

It is not recommended to continue driving your vehicle with the P0643 code present, as it can lead to further damage and potential safety hazards.

6. How can I repair the Sensor Power Supply Circuit Short (P0643) in my 2008 Nissan Pathfinder?

Repairing this issue may involve repairing or replacing damaged wiring or connectors, replacing the faulty sensor, or reprogramming the engine control module (ECM).

7. Will resetting the fault codes make the P0643 code go away in my 2008 Nissan Pathfinder?

Resetting the fault codes may temporarily clear the check engine light, but if the underlying issue causing the P0643 code is not addressed, the code is likely to return.

8. Is it safe to ignore the P0643 code in my 2008 Nissan Pathfinder?

Ignoring the P0643 code can lead to potential engine performance issues, decreased fuel efficiency, and further damage to engine components. It is best to address the issue promptly.

9. Can a DIY enthusiast repair the Sensor Power Supply Circuit Short (P0643) in a 2008 Nissan Pathfinder?

While some DIY enthusiasts may be able to diagnose and repair this issue, it is recommended to consult a professional mechanic for proper diagnosis and repair to ensure the issue is resolved correctly.

10. How much does it typically cost to fix the Sensor Power Supply Circuit Short (P0643) in a 2008 Nissan Pathfinder?

The cost of repairing the P0643 code can vary depending on the specific cause of the issue, but it may range from $100 to $500 or more, including parts and labor.