AutoCodes – Dodge – P0642 Dodge

P0642 Dodge Code - Sensor Reference Voltage 1 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 Dodge indicates Sensor Reference Voltage 1 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 38,132

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 Dodge 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 Dodge - Sensor Reference Voltage 1 Circuit Low - AutoCodes.com — P0642 Dodge Code - Sensor Reference Voltage 1 Circuit Low

What does this mean?

What are the Possible Causes of the DTC P0642 Dodge?

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 Dodge?

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 Dodge 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.

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Get the P0642 Dodge 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 Dodge Code

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

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

2. What does the OBDII code P0642 Dodge indicate?

- The code P0642 indicates a problem with the Sensor Reference Voltage 1 Circuit being too low in a Dodge vehicle.

3. What are the possible causes of the Sensor Reference Voltage 1 Circuit being low in a Dodge?

- Possible causes include a faulty sensor, damaged wiring or connectors, a malfunctioning Engine Control Module (ECM), or a low battery voltage.

4. How can I diagnose the cause of OBDII code P0642 in my Dodge vehicle?

- To diagnose the issue, you can use an OBDII scanner to retrieve the code and then inspect the sensor, wiring, connectors, and ECM for any visible damage or issues.

5. Can I drive my Dodge with the P0642 code present?

- It is not recommended to drive your vehicle with the P0642 code present as it can lead to further engine problems and potential safety hazards.

6. How can I repair OBDII code P0642 in my Dodge?

- Repairing the issue involves identifying the root cause (sensor, wiring, ECM), replacing any faulty components, and clearing the code with an OBDII scanner.

7. Is it safe to continue driving if the Check Engine Light is on due to code P0642?

- It is best to avoid driving your Dodge if the Check Engine Light is on due to code P0642 to prevent any potential damage to the engine or emissions system.

8. Can a DIY enthusiast fix OBDII code P0642 in a Dodge?

- Depending on your automotive skills and knowledge, you may be able to fix the issue yourself by following repair guides and using the necessary tools.

9. How much does it cost to repair OBDII code P0642 in a Dodge at a professional mechanic?

- The cost of repairing code P0642 can vary depending on the root cause and labor rates, but it typically ranges from $100 to $300 at a professional mechanic.

10. Will clearing the OBDII code P0642 reset itself permanently?

- Clearing the code may temporarily turn off the Check Engine Light, but if the underlying issue is not fixed, the code may reappear, indicating the problem still exists.