Easy one-page printout for the garage or repair shop
This summary uses the existing diagnostic information shown in full below.
This code means there's a problem with the car's sensor that checks air pressure. It's like when a toy's battery is not connected properly, so it doesn't work right.
The C0547 code indicates an issue with the supply voltage circuit for the vacuum sensor, which is responsible for measuring the vacuum pressure in the system.
The vacuum sensor supply voltage circuit is responsible for providing the necessary power to the vacuum sensor. If there is an open circuit or a voltage issue, the sensor cannot function correctly, leading to incorrect readings of vacuum pressure, which can affect vehicle performance.
• Check Engine Light is on
• Poor engine performance
• Inconsistent idle speed
• Faulty vacuum sensor
• Damaged wiring or connectors
• Blown fuse in the sensor circuit
Vacuum Sensor: A device that measures the pressure within the intake manifold.
Circuit: A path through which electricity flows.
• Check for any blown fuses related to the vacuum sensor circuit.
• Inspect wiring and connectors for damage or disconnection.
• Test the vacuum sensor for proper operation.
• Replace any blown fuses.
• Repair or replace damaged wiring or connectors.
• Replace the vacuum sensor if faulty.
• Multimeter
• OBD-II scanner
• Basic hand tools
$100 - $300
Moderate
• Chevrolet Silverado
• GMC Sierra
• Cadillac Escalade
• Regularly inspect and maintain wiring and connectors.
• Ensure proper installation of sensors.
• Perform regular diagnostic checks.
Sensor Issue
• Have the vehicle inspected by a professional if the Check Engine Light is on.
• Avoid driving with this issue for extended periods to prevent further damage.
Check with your vehicle manufacturer for specific warranty coverage related to sensors and electrical components.
This code has been associated with vehicles experiencing sensor-related issues due to wiring problems or sensor failure.
Moderate – It should be addressed soon to avoid potential drivability issues.
Ignoring this code may lead to vehicle performance issues, which could be unsafe. Always ensure your vehicle is in good working condition.
• Vehicle must be in a safe, stationary position.
• Engine should be turned off before inspecting electrical components.
The vacuum sensor is typically located in the engine bay, near the intake manifold.
Q: What happens if I ignore this code?
A: Ignoring this code can lead to poor engine performance and potential damage to other components.
Q: Can I drive with this code?
A: While the vehicle may still be drivable, it's best to address the issue to avoid further complications.
Pro · Four-system diagnostics
A handheld scanner aimed at engine, transmission, ABS, and airbag diagnostic work.
Chassis and ABS faults usually need a scanner that can read brake-system data directly.
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Universal · Torque wrench
Useful when reassembly torque matters for wheel, suspension, and under-hood fasteners.
Useful when wheel, hub, or suspension hardware needs correct reassembly torque.
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Universal · Drive-on ramps
Helpful for safer access underneath the vehicle during exhaust, EVAP, and underbody inspection work.
Helpful for safer access during underbody inspection work.
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