AutoCodes – Nissan – P0643 2007 Nissan Sentra

P0643 2007 Nissan Sentra 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 Sentra 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 2,842

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

What does this mean?

What are the Possible Causes of the DTC P0643 2007 Nissan Sentra?

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 Sentra?

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 Sentra 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 Sentra code?

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

1. What does OBDII code P0643 on a 2007 Nissan Sentra indicate?

- OBDII code P0643 in a 2007 Nissan Sentra refers to a malfunction in the Sensor Power Supply Circuit Short.

2. What are the common symptoms of a Sensor Power Supply Circuit Short in a 2007 Nissan Sentra?

- Common symptoms include engine stalling, poor fuel economy, rough idling, and difficulty starting the vehicle.

3. What are the possible causes of the Sensor Power Supply Circuit Short in a 2007 Nissan Sentra?

- Possible causes include a faulty sensor, damaged wiring or connectors, a short circuit, or issues with the engine control module (ECM).

4. How serious is OBDII code P0643 on a 2007 Nissan Sentra?

- While the vehicle may still be operable with this code present, it is important to address the issue promptly to prevent further damage and ensure optimal performance.

5. Can I continue driving my 2007 Nissan Sentra with the P0643 code?

- It is recommended to avoid driving the vehicle for an extended period with this code present to prevent potential damage to the engine or other components.

6. How can I diagnose a Sensor Power Supply Circuit Short in my 2007 Nissan Sentra?

- Diagnosing this issue typically involves using a diagnostic scanner to retrieve the trouble code and then inspecting the sensor, wiring, and connectors for any visible damage.

7. How can I repair a Sensor Power Supply Circuit Short in a 2007 Nissan Sentra?

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

8. Can I reset the OBDII code P0643 in my 2007 Nissan Sentra by disconnecting the battery?

- While disconnecting the battery may temporarily clear the code, it is recommended to address the underlying issue causing the code to prevent it from reoccurring.

9. How much does it cost to fix a Sensor Power Supply Circuit Short in a 2007 Nissan Sentra?

- The cost of fixing this issue can vary depending on the root cause of the problem, the required parts, and labor costs. It is advisable to consult a mechanic for an accurate estimate.

10. Is it possible to prevent OBDII code P0643 in a 2007 Nissan Sentra?

- Regular maintenance, timely inspections, and addressing any warning signs can help prevent issues leading to OBDII code P0643 in a 2007 Nissan Sentra.