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 there's a problem with the part of the car that helps create a vacuum, which is needed for some parts to work properly. It's like if a straw had a hole in it and couldn't suck up your drink right.
The P258B code indicates an issue with the vacuum pump's control circuit, specifically that it is not operating within the expected range or performance parameters.
The vacuum pump is an essential component in vehicles, especially those with turbocharged engines, as it helps create the vacuum necessary for various systems such as the brake booster. The control circuit for this pump is monitored by the engine control module (ECM) to ensure it is functioning correctly. If the circuit's performance is outside the expected range, the ECM triggers the P258B code.
• Check Engine Light is on
• Reduced braking performance
• Hissing noise from the engine compartment
• Faulty vacuum pump
• Damaged or corroded wiring/connectors in the vacuum pump circuit
• Faulty ECM or software issue
ECM: Engine Control Module, the computer that manages engine functions.
Vacuum Pump: A device that creates a vacuum to assist in various vehicle functions, like braking.
• Use an OBD-II scanner to confirm the code.
• Inspect the vacuum pump and its wiring for damage or corrosion.
• Test the vacuum pump's operation and electrical connections.
• Replace or repair damaged wiring/connectors.
• Replace the vacuum pump if it is faulty.
• Update or reprogram the ECM if necessary.
• OBD-II scanner
• Multimeter
• Vacuum gauge
$150 - $500
Moderate
• Ford F-150
• Chevrolet Silverado
• Volkswagen Jetta
• Regularly inspect and maintain vacuum system components.
• Ensure electrical connections are clean and secure.
• Follow recommended service intervals for your vehicle.
Engine Performance
• Do not ignore the Check Engine Light.
• Have the vehicle inspected by a professional if you notice braking issues.
• Regular maintenance can prevent this issue.
Check with your vehicle manufacturer for warranty coverage on emissions-related components.
The P258B code has been more common in vehicles with turbocharged engines due to their reliance on vacuum systems.
Moderate – While the vehicle may still be drivable, reduced braking performance can be a safety concern.
Driving with a malfunctioning vacuum pump can lead to brake system failures, which are a significant safety risk.
• Vehicle engine running
• Use of OBD-II scanner connected to the vehicle
The vacuum pump is typically located on or near the engine, often driven by the camshaft or accessory belt.
Q: Can I drive with a P258B code?
A: It's not recommended to drive with this code, as it can affect braking performance, posing a safety risk.
Q: How do I reset the P258B code?
A: After repairs, use an OBD-II scanner to clear the code. If the issue is resolved, it should not return.
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.