Easy one-page printout for the garage or repair shop
This summary uses the existing diagnostic information shown in full below.
This code means that the car's computer is getting a signal that the part of the car that makes electricity (the alternator) is sending too much power. It's like when a light bulb gets too much electricity and might burn out.
The P0626 code indicates that the vehicle's powertrain control module (PCM) has detected a high voltage condition in the generator field control circuit.
The generator field control circuit is responsible for regulating the alternator's output to ensure the battery is charged properly. When the PCM detects a voltage level that is higher than expected in this circuit, it triggers the P0626 code. This can be due to a short circuit, faulty wiring, or a malfunctioning alternator.
• Battery warning light on the dashboard
• Dimming headlights
• Electrical accessories not working properly
• Battery not charging
• Faulty alternator
• Short circuit in the wiring
• Faulty voltage regulator
• Corroded or damaged connectors
Alternator: A component that generates electricity to charge the battery and power the electrical system.
PCM: Powertrain Control Module, the car's computer that controls the engine and transmission.
• Check for any other related trouble codes.
• Inspect the alternator and its connections for damage or corrosion.
• Test the alternator output voltage.
• Inspect and test the generator field control circuit wiring.
• Replace the faulty alternator.
• Repair or replace damaged wiring or connectors.
• Replace the voltage regulator if necessary.
• Multimeter
• OBD-II scanner
• Basic hand tools
$150 - $500
Moderate
• Ford F-150
• Chevrolet Silverado
• Toyota Camry
• Regularly inspect and maintain the battery and alternator.
• Ensure all electrical connections are clean and secure.
• Replace the alternator belt as needed.
Sensor Issue
• Do not ignore the battery warning light.
• Have the vehicle checked by a professional if you notice electrical issues.
• Regularly maintain your vehicle's electrical system.
Check with your vehicle manufacturer as alternator issues might be covered under warranty for new vehicles.
The P0626 code has been a common issue in vehicles with aging electrical systems, especially in models with high mileage.
Moderate – This issue should be addressed soon to avoid being stranded with a dead battery.
Driving with a faulty alternator can lead to battery failure, which may result in the vehicle stalling unexpectedly.
• Vehicle engine running
• Electrical accessories turned on
The alternator is typically located at the front of the engine and is driven by the serpentine belt.
Q: Can I drive with code P0626?
A: It's not recommended to drive for long with this code active, as it can lead to battery failure.
Q: How do I reset the P0626 code?
A: After repairs, use an OBD-II scanner to clear the code. If the issue is fixed, it should not return.
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