AutoCodes – Lincoln – P0642 Lincoln

P0642 Lincoln 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 Lincoln 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.

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Code Popularity 3,543

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 P0642 Lincoln 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 Lincoln - Sensor Reference Voltage 'A' Circuit Low - AutoCodes.com — P0642 Lincoln Code - Sensor Reference Voltage 'A' Circuit Low

What does this mean?

What are the Possible Causes of the DTC P0642 Lincoln?

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 Lincoln?

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 Lincoln 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 Lincoln code?

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

Need Help with the Code?

Get the P0642 Lincoln 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 Lincoln Code

1. What are the common symptoms of OBDII code P0642 in a Lincoln vehicle?

- Common symptoms of code P0642 include issues with engine performance, rough idling, stalling, and the illumination of the Check Engine Light.

2. What does the OBDII code P0642 in a Lincoln indicate?

- The P0642 code indicates a problem with the Sensor Reference Voltage 'A' Circuit being too low in the vehicle's engine control module.

3. What are the possible causes of the Sensor Reference Voltage 'A' Circuit Low code in a Lincoln?

- Possible causes of code P0642 include a faulty sensor, damaged wiring or connectors, a malfunctioning engine control module, or a low voltage condition in the circuit.

4. How can I diagnose the Sensor Reference Voltage 'A' Circuit Low issue in my Lincoln?

- Diagnosing code P0642 involves using a diagnostic scanner to retrieve the code, checking the sensor and circuit for any visible damage, and testing the voltage levels in the circuit.

5. Can I still drive my Lincoln with OBDII code P0642 present?

- It is not recommended to drive the vehicle with code P0642 present, as it can lead to further damage to the engine and other components.

6. How can I repair the Sensor Reference Voltage 'A' Circuit Low issue in my Lincoln?

- Repairing code P0642 may involve replacing a faulty sensor, repairing damaged wiring or connectors, or reprogramming the engine control module, depending on the exact cause of the issue.

7. Is it possible to reset the Check Engine Light after fixing the P0642 code in a Lincoln?

- Yes, once the underlying issue causing code P0642 has been fixed, the Check Engine Light can be reset using a diagnostic scanner to clear the code.

8. How much does it typically cost to repair OBDII code P0642 in a Lincoln?

- The cost of repairing code P0642 can vary depending on the exact cause of the issue, but it may range from $100 to $500 or more, including parts and labor.

9. Are there any preventive measures to avoid OBDII code P0642 in a Lincoln?

- To prevent code P0642, it is essential to perform regular maintenance on the vehicle, including checking the sensors and wiring for any signs of damage or wear.

10. Can a DIY enthusiast fix the Sensor Reference Voltage 'A' Circuit Low issue in a Lincoln?

- While some aspects of diagnosing and repairing code P0642 can be done by a DIY enthusiast, it is recommended to consult a professional mechanic for accurate diagnosis and repair.