Skip the auto shop - Our mechanics make house calls

P0558 OBD-II Trouble Code: Brake Booster Pressure Sensor Circuit High

diagnostic check engine light

A P0558 trouble code is related to a vehicle’s brake booster pressure sensor and its signal being sent to the engine computer.

What the P0558 code means

P0558 is an OBD-II generic code for a voltage problem with the brake booster pressure sensor in that the signal being sent to the engine computer during braking is too high for the manufacturer’s parameters. This will make the computer think pressure is too high, sometime resulting in a firm brake pedal.

What causes the P0558 code?

The most common causes for a P0558 are:

What are the symptoms of the P0558 code?

Symptoms will vary from a simple check engine light, to a firm brake pedal that’s difficult to depress.

How does a mechanic diagnose the P0558 code?

Your mechanic will first visually inspect the brake booster, looking for any damaged wiring, hoses, electrical connectors, or low fluid levels. They will conduct a basic vacuum leak test of the hoses to determine if a simple hose replacement is in order. If anything seems out of place, parts will be replaced or repaired. However, if the visual inspection and vacuum leak test checks out, your mechanic will test the resistance of the brake booster pressure sensor before replacing it.

Common mistakes when diagnosing the P0558 code

Some P0558 codes can be caused by low fluid levels, especially if the vehicle in question uses a hydraulic brake booster feed by the power steering pump. Overlooking this may not cause the code to go away.

How serious is the P0558 code?

Most P0558 codes won’t cause any serious issues other than a check engine light, but in some cases, hard brake pedals will result.

What repairs can fix the P0558 code?

The most common repairs for a P0558 are as follows:

Additional comments for consideration regarding the P0558 code

Some P0558 codes are intermittent and can be cleared without a return, so it’s wise to clear the code and reset the engine computer first before parts are replaced.

Need help with a P0558 code?

YourMechanic offers certified mobile mechanics who will come to your home or office to diagnose and repair your vehicle. Get a quote and book an appointment online or speak to a service advisor at 1-800-701-6230.

The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details
Icon-warranty_badge-02

Skip the repair shop, our top-rated mechanics come to you.

At your home or office

Choose from 600+ repair, maintenance & diagnostic services. Our top-rated mechanics bring all parts & tools to your location.

Fair & transparent pricing

See labor & parts costs upfront, so you can book with confidence.

12-month, 12,000-mile warranty

Our services are backed by a 12-month, 12,000-mile warranty for your peace of mind.

Get A Quote

Need Help With Your Car?

Our certified mobile mechanics make house calls in over 2,000 U.S. cities. Fast, free online quotes for your car repair.

GET A QUOTE

More related articles

The Traveler’s Guide to Driving in Malaysia
CraigBurrows / Shutterstock.com Malaysia is a popular destination for many tourists today. The country has amazing sights and attractions that you will want to explore....
Veteran and Military Driver Laws and Benefits in Idaho
The state of Idaho offers a number of benefits and perks for those Americans who have either served in an Armed Forces branch in the...
Auto Safety Tips
Driving is more than a way to get from point A to point B. Owning and driving a car can also be a highly enjoyable experience. Whether a person is driving...


Related questions

Q: Rough idle and intermittent engine light on

Hello there, many faults can cause a rough idle and the Check Engine Light to be on with your 2007 Mazda 3. The first course of action would be to check what code is stored in the ECU. This code...

Q: Can't read OBD code with my scanner.

These aftermarket type scanners may not access every vehicle out there. When you get a cannot communicate issue this is most likely the OBD adapter and the vehicle may be incompatible or the vehicle has problems. You would need to...

Q: Car revs high

Air leaks into the intake system (a loose hose, or the EVAP valve as you have already experienced). If there are no codes, even transient codes which may not set the Check Engine Light, the problem could be a loose...