P0557: Brake Booster Pressure Sensor Circuit Low
What Does P0557 Mean?
P0557 is a diagnostic trouble code indicating: Brake Booster Pressure Sensor Circuit Low. This code relates to the vehicle speed and idle control system. It has been reported in NHTSA complaints across 1 different vehicle models.
Symptoms of P0557
- ⚠️ Check engine light illuminated
Real Owner Reports
From NHTSA complaint database — actual owner descriptions.
"Driving home from our local town 4/15/2023, the brake pedal became to hard to push down. Check engine light came on as I got to my driveway, and that is 1 mile from the main road. My kids were scared to tears as was my girlfriend. Run a scan and dtc p0557. Come to find the vacuum pump on the top dri"
— Gmc Terrain owner, 04/15/2023
Source: NHTSA Complaints Database
Most Reported Vehicles for P0557
Based on NHTSA owner complaint data.
| # | Vehicle | Reports |
|---|---|---|
| 1 | GMC TERRAIN |
Frequently Asked Questions
Why does my car idle rough?
Can a dirty throttle body cause this?
What To Do Next
Possible Fixes
- 🔧 Have the code scanned with a professional-grade scanner to read freeze frame data
- 🔧 If DIY repair isn't feasible, get a diagnostic from a trusted mechanic ($50-150)
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1
Find your vehicle above
Click your make and model for real owner reports and common causes specific to your vehicle.
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2
Check for recalls
Go to nhtsa.gov/recalls and enter your VIN. Free repairs if covered.
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3
Get a professional diagnosis
A code alone doesn't identify the exact failed part. A diagnostic ($50–$150) pinpoints the root cause.