AutoCodes – Nissan – P0643 2007 Nissan Pathfinder

P0643 2007 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 2007 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 3,843

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 2007 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 2007 Nissan Pathfinder - Sensor Power Supply Circuit Short - AutoCodes.com — P0643 2007 Nissan Pathfinder Code - Sensor Power Supply Circuit Short

What does this mean?

What are the Possible Causes of the DTC P0643 2007 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 2007 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 2007 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 2007 Nissan Pathfinder code?

Need more information on how to fix the P0643 2007 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 2007 Nissan Pathfinder Code

1. What does the OBDII code P0643 mean on a 2007 Nissan Pathfinder?

P0643 indicates a problem with the sensor power supply circuit, specifically a high voltage or short in the circuit.

2. What are the common symptoms of the P0643 code in a 2007 Nissan Pathfinder?

Symptoms may include the check engine light turning on, poor engine performance, stalling, and issues with various sensors or electronic components.

3. What causes the P0643 code to appear in a 2007 Nissan Pathfinder?

Common causes include a shorted sensor, damaged wiring, a faulty powertrain control module (PCM), or a defective sensor power supply circuit.

4. Can I drive my 2007 Nissan Pathfinder with the P0643 code?

Driving with this code is not recommended, as it may cause further damage to the engine or electronic systems and result in unsafe driving conditions.

5. How is the P0643 code diagnosed on a 2007 Nissan Pathfinder?

A mechanic will use a scan tool to check for codes, inspect wiring and connectors for damage or shorts, and test the sensor power supply voltage.

6. What sensors are affected by the P0643 code in a 2007 Nissan Pathfinder?

Sensors that rely on the power supply circuit, such as the throttle position sensor, mass airflow sensor, or fuel pressure sensor, may be affected.

7. How do you fix the P0643 code on a 2007 Nissan Pathfinder?

Repairs may include replacing damaged wiring or connectors, fixing a shorted sensor, or reprogramming or replacing the PCM if necessary.

8. What tools are needed to repair the P0643 code on a 2007 Nissan Pathfinder?

Common tools include a multimeter, OBDII scanner, wiring diagrams, and possibly replacement sensors or connectors.

9. How much does it cost to fix the P0643 code on a 2007 Nissan Pathfinder?

Repair costs vary depending on the root cause, ranging from $50 for simple wiring repairs to $1,000 or more if the PCM needs replacement.

10. Can a bad battery cause the P0643 code on a 2007 Nissan Pathfinder?

While uncommon, a weak or failing battery can cause voltage irregularities that may contribute to this code. Always check the battery and charging system.