P0643 FORD - Sensor Reference Voltage 'A' Circuit High
P0643 FORD Possible Causes
- Faulty Engine Control Module (ECM)
- ECM harness is open or shorted
- ECM circuit poor electrical connection
- Shorted sensor on 5 volt circuit
How do I fix code P0643 FORD?Check the "Possible Causes" listed above. Visually inspect the related wiring harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector's pins.
Cost of diagnosing the P0643 FORD code
Labor: 1.0The cost of diagnosing the P0643 FORD code is 1.0 hour of labor. The auto repair labor rates vary by location, your vehicle's make and model, and even your engine type. Most auto repairs shops charge between $75 and $150 per hour.
When is the code detected?The Engine Control Module (ECM) has detected the sensor 5 volt reference circuit voltage is higher than expected
- Engine Light ON (or Service Engine Soon Warning Light)
P0643 FORD DescriptionThe 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.
More InformationNeed more information on how to fix the P0643 FORD code?
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Information for specific Ford models
Need more help?Get the P0643 Ford code diagnosed by a professional: Find a repair shop in your area
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