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P0558 is a diagnostic trouble code (DTC) for "Brake Booster Pressure Sensor Circuit High". This can happen for multiple reasons and a mechanic needs to diagnose the specific cause for this code to be triggered in your situation. Our certified mobile mechanics can come to your home or office to perform the Check Engine Light diagnostic. Once we are able to diagnose the problem, you will be provided with an upfront quote for the recommended fix and receive $20.00 off as a credit towards the repair. All our repairs are backed by our 12-month / 12,000-mile warranty.
A P0558 trouble code is related to a vehicle’s brake booster pressure sensor and its signal being sent to the engine computer.
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.
The most common causes for a P0558 are:
Symptoms will vary from a simple check engine light, to a firm brake pedal that’s difficult to depress.
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.
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.
Most P0558 codes won’t cause any serious issues other than a check engine light, but in some cases, hard brake pedals will result.
The most common repairs for a P0558 are as follows:
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.
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.