Easy one-page printout for the garage or repair shop
This summary uses the existing diagnostic information shown in full below.
The car has a part called a vacuum pump that helps with the brakes and other things. This code means the car's computer thinks there's a problem with the electrical part that controls this pump.
The P258C code is triggered when the engine control module (ECM) detects a low voltage or poor performance in the vacuum pump control circuit.
The vacuum pump is responsible for providing vacuum pressure to various systems in the vehicle, such as the brake booster. The control circuit 'A' is monitored by the ECM to ensure it is functioning correctly. If the ECM detects a voltage that is too low, it sets the P258C code.
• Check Engine Light is on
• Reduced braking performance
• Hissing noise from the engine compartment
• Engine performance issues
• Faulty vacuum pump
• Damaged wiring or connectors in the control circuit
• Blown fuse related to the vacuum pump circuit
• Faulty ECM
ECM: Engine Control Module, the computer that controls the engine's functions.
Vacuum Pump: A device that creates a vacuum to assist in various vehicle systems, like brakes.
• Use an OBD-II scanner to confirm the code.
• Inspect the vacuum pump and its wiring for damage.
• Check the fuse related to the vacuum pump circuit.
• Test the voltage and ground at the vacuum pump connector.
• Replace or repair damaged wiring or connectors.
• Replace the faulty vacuum pump.
• Replace the blown fuse.
• Reprogram or replace the ECM if necessary.
• OBD-II scanner
• Multimeter
• Basic hand tools
$150 - $600
Moderate
• Ford F-150
• Chevrolet Silverado
• Toyota Camry
• Regularly inspect and maintain the vacuum system.
• Ensure all electrical connections are secure.
• Replace worn-out components promptly.
Sensor Issue
• Do not ignore the Check Engine Light.
• Have your vehicle inspected by a professional if you notice braking issues.
• Regular maintenance can prevent such issues.
Check with your vehicle's manufacturer for warranty coverage on emissions-related components.
This code has been more common in vehicles with electric vacuum pumps, as opposed to older systems that relied on engine vacuum.
Moderate – While the vehicle may still be drivable, reduced braking performance can be dangerous.
Driving with a malfunctioning vacuum pump can lead to reduced braking performance, which is a safety hazard.
• Engine running
• Vehicle at operating temperature
The vacuum pump is usually located near the engine, often on the front or side of the engine block.
Q: Can I drive with a P258C code?
A: It's not recommended to drive with this code due to potential braking issues. Have it checked as soon as possible.
Q: How do I reset the P258C code?
A: After fixing the issue, use an OBD-II scanner to clear the code. If the problem is resolved, the code should not return.
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