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 VARIANT/TRIMSECTION 10 (HYBRID/EV CONTROL SYSTEM)DIAGNOSTIC INFORMATION AND PROCEDURESDTC P057B-P057ECIRCUIT/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 variant/trim than selected.
DTC P057C and P057D
- Verify that DTC P0562 or P0563 is not set.
- If DTC P0562 or P0563 is set, refer to DTC B1325, B1330, B1420, B1424, B1517, C0800, C0895, C0899, C0900, C12E1, C12E2, P0560, P0562, or P0563 for Hybrid (HP6).
- Ignition OFF, disconnect the harness connector at the B22 brake pedal position sensor.
- Ignition ON, verify that a test lamp illuminates between B+ and the low reference circuit terminal 5.
- If the test lamp does not illuminate, test the low reference circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the K59 starter generator control module.
- Ignition ON, test for 4.8-5.2 V between the 5 V reference circuit terminal 6 and ground.
- If less than the specified range, test the 5 V reference circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the K59 starter generator control module.
- If greater than the specified range, test the 5 V reference circuit for a short to voltage. If the circuit tests normal, replace the K59 starter generator control module.
- Test for less than 0.3 V between the signal circuit terminal 4 and ground.
- If greater than the specified range, test the signal circuit for a short to voltage. If the circuit tests normal, replace the K59 starter generator control module.
- Test for 4.8-5.2 V between the 5 V reference circuit terminal 6 and the signal circuit terminal 4.
- If less than the specified range, test the signal circuit for an open/high resistance. If the circuit tests normal, replace the K59 starter generator control module.
- Ignition OFF, disconnect the X2 harness connector at the K59 starter generator control module.
- Test for infinite resistance between the signal circuit terminal 4 and ground.
- If less than the specified range, test the signal circuit for a short to ground.
- If all circuits test normal, replace the B22 brake pedal position sensor.
DTC P057B
Operate the vehicle within the Conditions for Running and Setting the DTC and verify the DTC does not reset.
- If DTC P057B resets as current, replace the B22 brake pedal position sensor.
DTC P057E
- Replace the brake pedal position sensor.
- Perform the brake pedal position sensor calibration procedure. Refer to Brake Pedal Position Sensor Calibration .
- Operate the vehicle within the Conditions for Running and Setting the DTC and verify the DTC does not reset.
- If DTC P057E resets as current, replace the K59 starter generator 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:
- • 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.