Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSCHEVROLET2008HHR LT, 2.4 P, AUTOMATICREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 163 (CONVENTIONAL BRAKE COMPONENTS)BRAKE BOOSTER PRESSURE MONITORING SYSTEMDTC TROUBLESHOOTING INDEX
2008 Chevrolet HHR LT, 2.4 P, Automatic
DTC Troubleshooting Index
2008 Chevrolet HHR LT, 2.4 P, AutomaticSECTION DTC Troubleshooting Index
WARNING: This page is about a different car, the 2011 Honda Insight and 2010 Honda Insight. However, it is still accessible from the selected car via links, so may be relevant.
TROUBLESHOOTING CHART
| DTC | Detection Item |
|---|---|
| P0555 | Brake Booster Pressure Sensor A Circuit High Voltage |
| P0557 | Brake Booster Pressure Sensor A Circuit Low Voltage |
| P15C1 | Brake Booster Pressure Sensor B Circuit High Voltage |
| P15C2 | Brake Booster Pressure Sensor B Circuit Low Voltage |
| P15C3 | Brake Booster Pressure Sensor A/B Incorrect Voltage Correlation |
NOTE:
When these DTCs are stored, the IMA indicator light comes on.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.