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 MANUALSBUICK2013REGAL TURBO PREMIUM, STANDARD TRANSREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 156 (HYDRAULIC BRAKE SYSTEM)DIAGNOSTIC INFORMATION AND PROCEDURESDTC C1100CIRCUIT/SYSTEM TESTING
2013 Buick Regal Turbo Premium, Standard Trans
Circuit/System Testing
2013 Buick Regal Turbo Premium, Standard TransSECTION Circuit/System Testing
WARNING: This page is about a different car, the 2012 Buick Regal. However, it is still accessible from the selected car via links, so may be relevant.
- Ignition OFF, disconnect the harness connector at the B19B Brake Booster Vacuum Sensor.
- Test for less than 5 Ξ© between the low reference circuit terminal 2 and ground.
- If greater than the specified value, test the low reference circuit for an open/high resistance. If the circuit tests normal, replace the K17 Electronic Brake Control Module.
- Ignition ON, test for 4.8-5.2 V between the 5 V reference circuit terminal 3 and ground.
- If greater than the specified range, test the 5 V reference circuit for a short to voltage. If the circuit tests normal, replace the K17 Electronic Brake Control Module.
- If less than the specified range, test the 5 V reference circuit for an open/high resistance. If the circuit tests normal, replace the K17 Electronic Brake Control Module.
- Ignition OFF, disconnect the harness connector at the K17 Electronic Brake Control Module.
- Ignition ON, test for less than 0.5 V between the signal circuit terminal 1 at the B19B Brake Booster Vacuum Sensor harness connector and ground.
- If greater than the specified value, test the signal circuit for a short to voltage.
- Ignition OFF, test for infinite resistance between the signal circuit terminal 1 and ground.
- If less than the specified value, test the signal circuit for a short to ground.
- Test for less than 5 Ξ© between the signal circuit terminal 1 at the B19B Brake Booster Vacuum Sensor harness connector and terminal 22 at the K17 Electronic Brake Control Module harness connector.
- If greater than the specified value, test the signal circuit for an open/high resistance.
- If all circuits test normal, replace the B19B Brake Booster Vacuum Sensor and verify the DTC does not reset. If the DTC resets, replace the K17 Electronic Brake Control Module.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- β’ You smell fuel, burning insulation, or see smoke.
- β’ Brakes feel soft, pull hard to one side, or make grinding noises.
- β’ The engine overheats, stalls repeatedly, or misfires under load.
- β’ You are missing required tools, torque specs, or safe lifting equipment.
- β’ You are not confident in the next step or safety outcome.