AutoCodes – Infiniti – P0643 2006 Infiniti G35

P0643 2006 Infiniti G35 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 2006 Infiniti G35 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 4,350

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 2006 Infiniti G35 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 2006 Infiniti G35 - Sensor Power Supply Circuit Short - AutoCodes.com — P0643 2006 Infiniti G35 Code - Sensor Power Supply Circuit Short

What does this mean?

What are the Possible Causes of the DTC P0643 2006 Infiniti G35?

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 2006 Infiniti G35?

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 2006 Infiniti G35 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 2006 Infiniti G35 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 2006 Infiniti G35 Code

1. What are the common symptoms of OBDII code P0643 in a 2006 Infiniti G35?

- Common symptoms include engine stalling, rough idling, poor fuel economy, and the check engine light being illuminated on the dashboard.

2. What does the OBDII code P0643 for a 2006 Infiniti G35 indicate?

- The code P0643 indicates a fault in the sensor power supply circuit short.

3. What are the possible causes of OBDII code P0643 in a 2006 Infiniti G35?

- Possible causes 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 issue related to OBDII code P0643 in my 2006 Infiniti G35?

- Diagnose the issue by using a scan tool to check for the code, inspecting the wiring and connectors for any visible damage, and testing the sensor and power supply circuit for proper voltage.

5. Can I still drive my 2006 Infiniti G35 with OBDII code P0643?

- It is not recommended to drive the vehicle with code P0643, as it can lead to further damage and potential safety hazards. It is best to address the issue promptly.

6. How can I repair OBDII code P0643 in my 2006 Infiniti G35?

- To repair the issue, you may need to replace the faulty sensor, repair any damaged wiring or connectors, or reprogram the ECM if necessary.

7. Is resetting the check engine light enough to fix OBDII code P0643 in a 2006 Infiniti G35?

- Simply resetting the check engine light will not fix the underlying issue causing code P0643. Proper diagnosis and repair are necessary to resolve the problem.

8. Can a DIY enthusiast fix OBDII code P0643 in a 2006 Infiniti G35?

- Depending on your level of automotive expertise, you may be able to diagnose and repair the issue related to code P0643. However, complex electrical issues may require professional assistance.

9. How much does it cost to repair OBDII code P0643 in a 2006 Infiniti G35?

- The cost of repairing code P0643 can vary depending on the exact cause of the issue, parts needed, and labor rates. It is recommended to get a diagnostic from a mechanic for an accurate estimate.

10. Will passing an emissions test be affected by OBDII code P0643 in a 2006 Infiniti G35?

- Yes, having an unresolved OBDII code like P0643 can cause your vehicle to fail an emissions test. It is important to address the issue before attempting to pass an emissions inspection.