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 brake helper, which uses a pump to make braking easier, has stopped working on purpose because something is wrong.
The C1047 code indicates that the vehicle's brake system vacuum pump has been forced to shut down due to a detected issue, which may affect braking performance.
The brake system vacuum pump is responsible for creating a vacuum that assists the brake booster in applying the brakes with less effort. When the system detects a problem that could lead to a failure, it forces the pump to shut down to prevent further damage or safety issues.
• Increased brake pedal effort
• Brake warning light illuminated
• Reduced braking performance
• Faulty vacuum pump
• Electrical issues in the vacuum pump circuit
• Vacuum leaks in the brake system
Vacuum Pump: A device that removes air from the brake booster to assist in braking.
Brake Booster: A component that uses vacuum to reduce the effort needed to apply the brakes.
• Check for stored codes and freeze frame data.
• Inspect the vacuum pump and associated wiring for damage.
• Test the vacuum pump operation and check for vacuum leaks.
• Replace or repair the faulty vacuum pump.
• Fix any electrical issues in the pump circuit.
• Seal any vacuum leaks in the brake system.
• OBD-II scanner
• Multimeter
• Vacuum gauge
$150 - $500
Moderate
• Ford F-150
• Chevrolet Silverado
• Toyota Camry
• Regularly inspect brake system components.
• Ensure proper maintenance of the vacuum pump.
• Check for and repair any vacuum leaks promptly.
Brake System Issue
• Have your brakes inspected regularly.
• Address any brake system warnings immediately.
Check with the vehicle manufacturer for specific warranty coverage related to brake system components.
This code has been reported primarily in vehicles with higher mileage or those that have not had regular brake system maintenance.
High – This issue can affect braking performance, which is critical for vehicle safety.
Driving with impaired brakes can be dangerous and may violate vehicle safety regulations.
• Vehicle ignition in the ON position.
• Brake pedal depressed.
The vacuum pump is typically located near the engine, often mounted on the firewall or engine block.
Q: Can I drive with a C1047 code?
A: It's not recommended to drive with this code active as it can affect braking performance and safety.
Q: How do I reset the C1047 code?
A: After repairs, use an OBD-II scanner to clear the code, but ensure the problem is fixed first.
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.
View on Amazon
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.
View on Amazon
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.
View on AmazonThese are optional diagnostic tools, not guaranteed fixes. As an Amazon Associate I earn from qualifying purchases.