AutoCodes – Ford – P0642 2011 Ford Fusion

P0642 2011 Ford Fusion Code - Sensor Reference Voltage 'A' Circuit Low

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: P0642 2011 Ford Fusion indicates Sensor Reference Voltage 'A' Circuit Low.
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.

Save to My Repairs My Repairs

AI answers can be wrong. Verify repairs with testing. Open full chat

Code Popularity 2,498

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
Add Comment

💬 Need more help? Ask Coddy for instant answers — it's free!

Code P0642 2011 Ford Fusion 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 P0642 2011 Ford Fusion - Sensor Reference Voltage 'A' Circuit Low - AutoCodes.com — P0642 2011 Ford Fusion Code - Sensor Reference Voltage 'A' Circuit Low

What does this mean?

What are the Possible Causes of the DTC P0642 2011 Ford Fusion?

Faulty Engine Control Module (ECM)
ECM harness is open or shorted
ECM circuit poor electrical connection
Shorted sensor on 5 volt circuit

How to Fix the DTC P0642 2011 Ford Fusion?

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 P0642 2011 Ford Fusion 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 P0642 2011 Ford Fusion code?

Need more information on how to fix the P0642 2011 Ford Fusion code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P0642 2011 Ford Fusion code diagnosed by a professional: Find a repair shop in your area

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 P0642 2011 Ford Fusion Code

1. What are the common symptoms of OBDII code P0642 in a 2011 Ford Fusion?

- Common symptoms include engine stalling, rough idling, poor acceleration, and illuminated Check Engine Light.

2. What does the OBDII code P0642 'Sensor Reference Voltage 'A' Circuit Low' mean for a 2011 Ford Fusion?

- This code indicates that the voltage signal from the sensor reference circuit 'A' is lower than normal, affecting the engine performance.

3. What are the possible causes of OBDII code P0642 in a 2011 Ford Fusion?

- Possible causes may include a faulty sensor, damaged wiring or connectors, issues with the powertrain control module (PCM), or a low battery voltage.

4. How can I diagnose the OBDII code P0642 in my 2011 Ford Fusion?

- To diagnose this code, you can use a diagnostic scanner to retrieve the trouble codes, check the sensor reference voltage, inspect the wiring, and test the sensor for proper operation.

5. Is it safe to continue driving with OBDII code P0642 in a 2011 Ford Fusion?

- It is not recommended to drive with this code as it can lead to potential engine performance issues and further damage if left unresolved.

6. How can I repair OBDII code P0642 in my 2011 Ford Fusion?

- Repair options may include replacing the faulty sensor, repairing damaged wiring or connectors, resetting the PCM, or addressing any other underlying issues causing the low voltage.

7. Can a DIY enthusiast fix OBDII code P0642 in a 2011 Ford Fusion?

- Depending on your mechanical skills and access to tools, some DIY enthusiasts may be able to address this code by following repair guides or seeking assistance from online forums.

8. Will resetting the Check Engine Light resolve OBDII code P0642 in a 2011 Ford Fusion?

- Simply resetting the light will not fix the underlying issue causing the code. It's essential to diagnose and repair the root cause to prevent the code from reoccurring.

9. How long does it typically take to repair OBDII code P0642 in a 2011 Ford Fusion?

- The repair time can vary based on the specific cause of the code and the complexity of the repair. It could take anywhere from a few hours to a full day to address the issue.

10. Are there any recalls or technical service bulletins related to OBDII code P0642 in a 2011 Ford Fusion?

- It's advisable to check with Ford or a trusted dealership to inquire about any recalls or technical service bulletins related to this specific OBDII code to see if there are any known issues or remedies provided by the manufacturer.