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

P0222 OBD-II Trouble Code: Throttle/Pedal Position Switch/Sensor B Circuit Low Input
P0222 code definition Throttle/Pedal Position Switch/Sensor B Circuit Low Input What the P0222 code means The manufacturer specifies a range of acceptable voltage to be produced from the throttle position...
P0240 OBD-II Trouble Code: Turbocharger Boost Sensor B Circuit Range/Performance
P0240 code definition Turbocharger Boost Sensor B Circuit Range/Performance What the P0240 code means P0240 is an OBD-II generic code triggered when the Engine Control Module (ECM) detects the intake boost...
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...


Related questions

Q: Rransmission slipping causing check engine light to come on hard shifting when warm only first gear is harsh

Hello. From what you describe it would appear that your vehicle may be experiencing some mild to serious transmission issues. If the Check Engine Light is on I would recommend retrieving the trouble codes, as they will likely shed some...

Q: Opinion on car theft through OBD port

Not really. A lot of it is just scam you know. People aren't stealing by plugging it in your car. First, they have to get in to begin with. The only time something like that happens is with high-end stuff...

Q: I get trouble code P2138, but I have cleared it and the car works for a while. Now I am getting trouble code P2127 along with P2138.

Hi there. The pedal position sensor on the gas pedal has lost signal for the switch 'E' and 'D'. The code P2138 means that the computer has discovered a malfunction with the pedal sensor. Check the harness to the...