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 P0A2B-P0A2DCIRCUIT/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 OFF, disconnect the starter generator X1 harness connector from the A15 starter generator.
- Ignition ON, test the harness side for less than 12 ohms between the low reference circuit terminal 7 and ground.
- If greater than the specified range, test the low reference circuit for an open/high resistance. If the circuit tests normal, replace the K59 starter generator control module.
- Ignition ON, verify the scan tool motor temperature sensor parameter is -40°C (-40°F).
- If more than the specified value, test the motor temperature sensor signal circuit for a short to ground. If the circuit tests normal, replace the K59 starter generator control module.
- Install a 3-amp fused jumper wire between the signal circuit X1 terminal 8 and the low reference circuit X1 terminal 7 at the A15 starter generator. Verify the scan tool motor temperature sensor parameter is greater than 214°C (417°F):
- If less than the specified value, test the signal circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the K59 starter generator control module.
NOTE:If a short to voltage is found, test the motor temperature sensor for an open circuit or physical damage.
- Ignition OFF, measure and record the resistance between the sensor signal and low reference terminals. Compare the actual sensor and circuit resistance to the expected sensor resistance. Refer to Temperature Versus Resistance .
- If the resistance is not near the expected value, replace the A15 starter generator.
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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.