Engine-Codes - Nissan - P0643 2011 NISSAN SENTRA

P0643 2011 NISSAN SENTRA - Sensor Power Supply Circuit Short

Repair Importance Level: 3/3
Repair Difficulty Level: 3/3  What is this?
Table of contents

P0643 2011 NISSAN SENTRA Possible Causes

  • 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 is the P0643 2011 NISSAN SENTRA code repair?

Start by checking the "Possible Causes" listed above. Visually inspect the related wiring harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector's pins.

What is the cost to diagnose the P0643 2011 NISSAN SENTRA code

Labor: 1.0

The cost to diagnose the P0643 2011 NISSAN SENTRA code is 1.0 hour of labor. The auto repair's diagnosis time and labor rates vary by location, vehicle's make and model, and even your engine type. Most auto repair shops charge between $75 and $150 per hour.
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When is the code detected?

The Engine Control Module (ECM) has detected the sensor 5 volt reference circuit voltage is higher than expected

Possible Symptoms

  • Engine Light ON (or Service Engine Soon Warning Light)

P0643 2011 NISSAN SENTRA Meaning

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.

More Information

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