AutoCodes – Nissan – P0643 2010 Nissan Sentra

P0643 2010 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 2010 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 2,609

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 2010 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 2010 Nissan Sentra - Sensor Power Supply Circuit Short - AutoCodes.com — P0643 2010 Nissan Sentra Code - Sensor Power Supply Circuit Short

What does this mean?

What are the Possible Causes of the DTC P0643 2010 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 2010 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 2010 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 2010 Nissan Sentra code?

Need more information on how to fix the P0643 2010 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 2010 Nissan Sentra Code

1. What does the OBDII code P0643 mean on a 2010 Nissan Sentra?

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

2. What are the common symptoms of code P0643 in a 2010 Nissan Sentra?

Symptoms may include the Check Engine Light turning on, poor engine performance, stalling, or difficulty starting.

3. What causes the P0643 code in a 2010 Nissan Sentra?

Common causes include a faulty sensor, a shorted wiring harness, a malfunctioning Engine Control Module (ECM), or a poor electrical connection in the circuit.

4. Can a faulty ECM cause the P0643 code?

Yes, a malfunctioning ECM can cause P0643 if it fails to regulate the sensor power supply circuit properly.

5. How can I diagnose the P0643 code on my 2010 Nissan Sentra?

Use an OBDII scanner to confirm the code, inspect the wiring and connectors for damage, and test the affected sensors and ECM for proper voltage and continuity.

6. What sensors might be affected by the P0643 code in a 2010 Nissan Sentra?

Any sensor relying on the 5V reference circuit, such as the throttle position sensor, MAP sensor, or fuel pressure sensor, could be affected.

7. Can driving with a P0643 code damage my 2010 Nissan Sentra?

Yes, prolonged driving with this code may lead to further engine or electrical system damage due to improper sensor readings.

8. How much does it typically cost to fix a P0643 code?

Repair costs vary but may range from $100 to $500 depending on whether the issue involves wiring repairs, sensor replacement, or ECM repair.

9. Can I clear the P0643 code without fixing the issue?

While the code can be cleared temporarily, the issue will likely reoccur until the root cause is addressed.

10. Should I take my 2010 Nissan Sentra to a professional for the P0643 code?

If youâ€™re unfamiliar with electrical diagnostics or repair, itâ€™s recommended to consult a professional mechanic to accurately diagnose and fix the issue.