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 PROCEDURESDC POWER CONVERSION TESTCIRCUIT/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.
- Ignition ON, verify that no K1 14V power module or B18 battery current sensor DTCs are set that would cause a charging system concern.
- If DTCs are set, refer to Diagnostic Trouble Code (DTC) List - Vehicle .
- Ignition OFF, measure the voltage across the battery terminals. The voltage should read 12.4 V or greater at room temperature.
- If not within the specified range, refer to Battery Inspection/Test
- Connect a carbon pile tester to the C1 battery.
- Start and idle the engine, turn all accessories off. Observe the voltage reading on the tester. The voltage should read between 12.6-15.5V.
- Adjust the carbon pile tester so that the 12V current on the 14V power module data list is reading 120 amps. The voltage reading should remain between 12.6-15.5V.
- If not within the specified value, replace the K1 14V power 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.