P0642 2010 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 2010 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.
Code P0642 2010 Ford Fusion Description
What are the Possible Causes of the DTC P0642 2010 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 2010 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 2010 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.
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Frequently Asked Questions about P0642 2010 Ford Fusion Code
1. What are the common symptoms of OBDII code P0642 on a 2010 Ford Fusion?
- Common symptoms include engine stalling, rough idling, poor fuel economy, and the illumination of the check engine light.
2. What does the OBDII code P0642 'Sensor Reference Voltage 'A' Circuit Low' mean on a 2010 Ford Fusion?
- This code indicates that the voltage in the sensor reference 'A' circuit is lower than the specified range.
3. What are the potential causes of OBDII code P0642 on a 2010 Ford Fusion?
- Potential causes include a faulty sensor, damaged wiring or connectors in the sensor circuit, a defective Engine Control Module (ECM), or a low battery voltage.
4. How can I diagnose the cause of OBDII code P0642 on my 2010 Ford Fusion?
- To diagnose the issue, you can perform a visual inspection of the sensor and its wiring, use a multimeter to check voltage levels, and conduct a scan tool test to monitor sensor data.
5. Can I continue driving my 2010 Ford Fusion with OBDII code P0642?
- It is not recommended to drive your vehicle with this code present, as it can lead to further damage and potential safety hazards. It's best to address the issue promptly.
6. How can I repair OBDII code P0642 on my 2010 Ford Fusion?
- Repair options include replacing the faulty sensor, repairing damaged wiring, cleaning or reseating connectors, or reprogramming the ECM if necessary.
7. Will resetting the check engine light resolve OBDII code P0642 on a 2010 Ford Fusion?
- Resetting the check engine light may temporarily turn it off, but it will not fix the underlying issue causing the code. Proper diagnosis and repair are needed.
8. Can a DIY enthusiast fix OBDII code P0642 on a 2010 Ford Fusion?
- Depending on your skill level and access to tools, you may be able to address this code yourself by following repair guides and using diagnostic equipment.
9. How much does it cost to repair OBDII code P0642 on a 2010 Ford Fusion at a professional mechanic?
- Repair costs can vary depending on the exact cause of the code, but expect to pay anywhere from $100 to $500 for parts and labor at a repair shop.
10. Is OBDII code P0642 a common issue in 2010 Ford Fusion vehicles?
- While not extremely common, this code can still occur in 2010 Ford Fusion models due to sensor or wiring issues, among other potential causes.
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