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.
SYS.OK|MANUAL.DBβ LIVE
HOMESERVICE MANUALSBUICK2013REGAL TURBO PREMIUM, STANDARD TRANSREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT VARIANT/TRIMSECTION 10 (HYBRID/EV CONTROL SYSTEM)DIAGNOSTIC INFORMATION AND PROCEDURESDTC P0A8D OR P0A8ECIRCUIT/SYSTEM VERIFICATION
2013 Buick Regal Turbo Premium, Standard Trans
Circuit/System Verification
2013 Buick Regal Turbo Premium, Standard TransSECTION Circuit/System Verification
WARNING: This page is about a different variant/trim than selected.
P0A8EΒ
If the DTC is set, replace the K59 starter generator control module.
P0A8D
- Ignition OFF, measure and record the battery voltage at the C1 12V battery terminals. The battery voltage should stabilize between 12.4 and 12.8 V within a few minutes of turning the ignition OFF.
- If not within the specified range, refer to Battery Inspection/Test for Hybrid (HP6).
- Ignition ON, observe the scan tool Ignition 1 Signal parameter in the 14V Power Module data list. The parameter should be within 4.5 volts of the Low Voltage Circuit Voltage measured at the C1 12V battery.
- If the voltage is not within the specified range, check the ignition circuit to the K59 starter generator control module for high resistance.
- Remove the B+ terminal at the K59 starter generator control module.
- Connect a test lamp between C1 12-volt positive battery post and the K59 starter generator control module terminal at the module.
- Ignition ON, observe the scan tool parameter Low-Voltage Circuit Voltage in the 14V Power Module data list. The parameter should be within 0.5 volt of the actual 12-volt battery voltage.
- If the voltage is not within the specified range, replace the K59 starter generator control module.
- Ignition OFF, remove the positive connection at the C1 12-volt battery.
- Measure the resistance of the 14 V Power Module positive harness between the X10 connector at the K59 starter generator control module and the X50A Fuse block-Underhood connection.
- If the resistance is greater than 1.0 Ξ©, repair the open/high resistance condition in the 12-volt circuit.
- If the resistance is less than 1.0 Ξ©, Test the 175 amp fuse in the X50A fuse block-underhood. If the fuse tests good, replace the K59 starter generator control module.
RENDER: 1.0x
NO RELATED
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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.