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 a part of the car that controls how much air goes into the engine isn't getting enough power. It's like trying to use a toy that doesn't have enough batteries.
The code indicates that the voltage supply to the wastegate position sensor for Turbocharger/Supercharger 'B' is lower than expected.
The wastegate position sensor monitors the position of the wastegate, which controls the boost pressure of the turbocharger or supercharger. A low voltage circuit condition means the sensor is not receiving or sending the correct electrical signals, potentially affecting engine performance.
• Reduced engine performance
• Check Engine Light (CEL) on
• Poor acceleration
• Faulty wastegate position sensor
• Damaged wiring or connectors
• Faulty power supply to the sensor
Turbocharger: A device that increases an engine's efficiency and power output by forcing extra air into the combustion chamber.
Wastegate: A valve that controls the flow of exhaust gases to the turbocharger, regulating boost pressure.
• Use an OBD-II scanner to confirm the code.
• Inspect the wiring and connectors to the wastegate position sensor.
• Test the voltage supply to the sensor.
• Replace the faulty wastegate position sensor.
• Repair or replace damaged wiring or connectors.
• Ensure proper voltage supply to the sensor.
• OBD-II scanner
• Multimeter
• Wrench set
$150 - $400
Moderate
• Ford F-150
• Chevrolet Silverado
• Dodge Ram 1500
• Regular maintenance checks
• Ensure connectors are secure
• Avoid overloading the turbocharger
Sensor Issue
• Do not ignore the Check Engine Light.
• Seek professional diagnosis if unsure.
• Regularly maintain your vehicle to prevent sensor issues.
Check with your vehicle manufacturer for specific warranty coverage on sensors.
This code has been associated with vehicles that have turbocharged or supercharged engines, particularly in models with high mileage.
Moderate – While the vehicle may still be operable, reduced performance and potential engine damage make it important to address soon.
Driving with a malfunctioning wastegate sensor can lead to increased emissions and may not comply with local vehicle emission standards.
• Engine running
• Vehicle at normal operating temperature
The wastegate position sensor is typically located near the turbocharger or supercharger, often on the intake manifold or near the exhaust manifold.
Q: Can I drive with a P12C3 code?
A: It's not recommended as it may lead to reduced engine performance and potential damage.
Q: How do I know if my wastegate sensor is bad?
A: Symptoms include poor acceleration, reduced engine power, and the Check Engine Light being on.
Budget · Enhanced code reader
A wired color-screen reader with readiness hotkeys, live data, code definitions, and data logging.
A dependable first-pass scanner for verifying the code and checking live data or readiness monitors.
View on Amazon
Universal · Digital multimeter
A solid entry-level multimeter for voltage, continuity, resistance, and basic electrical troubleshooting.
Helpful for voltage, continuity, and basic electrical checks while narrowing down the fault.
View on Amazon
Universal · Socket set
A practical metric and SAE socket set for many diagnostic teardowns and component replacements.
Useful for common under-hood access and removal work during diagnosis or repair.
View on AmazonThese are optional diagnostic tools, not guaranteed fixes. As an Amazon Associate I earn from qualifying purchases.