AutoCodes – Nissan – P0643 2006 Nissan Maxima

P0643 2006 Nissan Maxima 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 Nissan Maxima 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 5,022

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 Nissan Maxima 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 Nissan Maxima - Sensor Power Supply Circuit Short - AutoCodes.com — P0643 2006 Nissan Maxima Code - Sensor Power Supply Circuit Short

What does this mean?

What are the Possible Causes of the DTC P0643 2006 Nissan Maxima?

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 Nissan Maxima?

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 Nissan Maxima 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 Nissan Maxima code?

Need more information on how to fix the P0643 2006 Nissan Maxima 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 2006 Nissan Maxima Code

1. What does OBDII code P0643 for a 2006 Nissan Maxima mean?

The code P0643 in a 2006 Nissan Maxima indicates a fault in the Sensor Power Supply Circuit Short.

2. What are the common symptoms of OBDII code P0643 in a 2006 Nissan Maxima?

Common symptoms of P0643 may include illuminated Check Engine Light, rough engine performance, and potential stalling of the vehicle.

3. What are the possible causes of OBDII code P0643 in a 2006 Nissan Maxima?

Potential causes of P0643 include a faulty sensor, damaged wiring or connectors in the sensor circuit, or a malfunctioning Engine Control Module (ECM).

4. How can I diagnose the Sensor Power Supply Circuit Short issue related to OBDII code P0643 in my 2006 Nissan Maxima?

To diagnose P0643, you may need to perform a thorough inspection of the sensor circuit, check for any damaged wiring or connectors, and test the sensor itself using a multimeter.

5. Can I still drive my 2006 Nissan Maxima with the OBDII code P0643 present?

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

6. How can I repair the Sensor Power Supply Circuit Short issue causing OBDII code P0643 in my 2006 Nissan Maxima?

Repairing P0643 may involve replacing the faulty sensor, repairing any damaged wiring or connectors, or reprogramming the Engine Control Module (ECM).

7. Is it safe to reset the Check Engine Light after fixing the OBDII code P0643 in my 2006 Nissan Maxima?

Once the issue causing P0643 is resolved, it is safe to reset the Check Engine Light using an OBDII scanner or by disconnecting the car's battery for a few minutes.

8. How much can I expect to pay for repairing the Sensor Power Supply Circuit Short issue related to OBDII code P0643 in my 2006 Nissan Maxima?

The cost of repairing P0643 can vary depending on the extent of the damage and the specific components that need replacement. It is advisable to consult a professional mechanic for an accurate estimate.

9. Can a DIY enthusiast with basic automotive knowledge fix the OBDII code P0643 issue in a 2006 Nissan Maxima?

While some DIY enthusiasts may be able to address the P0643 code themselves, it is recommended to seek professional help, especially when dealing with complex electrical issues like sensor circuits.

10. Will fixing the OBDII code P0643 improve the overall performance and fuel efficiency of my 2006 Nissan Maxima?

Fixing the P0643 code can potentially improve the overall performance and fuel efficiency of your vehicle by ensuring that the sensor circuit is functioning correctly and providing accurate data to the Engine Control Module.