P0642 2007 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 2007 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 2007 Ford Fusion Description
What are the Possible Causes of the DTC P0642 2007 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 2007 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 2007 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 2007 Ford Fusion Code
What does the OBDII code P0642 mean on a 2007 Ford Fusion?
P0642 indicates a low voltage condition in the Sensor Reference Voltage 'A' circuit, which supplies power to certain engine sensors.
What are the common symptoms of code P0642 in a 2007 Ford Fusion?
Symptoms may include the check engine light turning on, poor engine performance, stalling, reduced fuel efficiency, or issues with sensor readings.
What causes the P0642 code on a 2007 Ford Fusion?
Potential causes include a short to ground in the sensor reference voltage circuit, a faulty sensor, damaged wiring, or a failing powertrain control module (PCM).
How do you diagnose the P0642 code on a 2007 Ford Fusion?
Diagnosis involves using a multimeter to check for shorts or voltage drops in the reference circuit, inspecting wiring and connectors, and testing sensors connected to the circuit.
Can a bad PCM cause the P0642 code on a 2007 Ford Fusion?
Yes, a malfunctioning PCM can cause the P0642 code, but this is typically a last resort after ruling out wiring and sensor issues.
Can I drive my 2007 Ford Fusion with the P0642 code?
Driving with this code is not recommended, as it can lead to poor performance, possible stalling, and further damage to the vehicle.
How do you fix the P0642 code on a 2007 Ford Fusion?
Repairs may include fixing damaged wiring, replacing a faulty sensor, or, in rare cases, replacing the PCM.
What tools are needed to troubleshoot the P0642 code?
Common tools include an OBDII scanner, multimeter, and possibly a wiring diagram for the vehicle.
Which sensors are affected by the P0642 code on a 2007 Ford Fusion?
Sensors using the shared 5-volt reference circuit, such as the throttle position sensor, MAP sensor, or others, may be affected.
How much does it cost to fix the P0642 code on a 2007 Ford Fusion?
Repair costs depend on the issue but can range from $50 for wiring repairs to $500 or more if the PCM needs replacement.
Discuss the causes and fixes for P0642 2007 Ford Fusion OBDII Code
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