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 54 (DATA COMMUNICATIONS SYSTEM)DIAGNOSTIC INFORMATION AND PROCEDURESDTC U0074CIRCUIT/SYSTEM TESTINGTESTING THE IGNITION CIRCUIT
2013 Buick Regal Turbo Premium, Standard Trans
Testing the Ignition Circuit
2013 Buick Regal Turbo Premium, Standard TransSECTION Testing the Ignition Circuit
WARNING: This page is about a different car, the 2011 Buick Regal. However, it is still accessible from the selected car via links, so may be relevant.
- Ignition OFF, disconnect the harness connectors with the ignition circuits at an easily accessible control module that is not communicating.
- Ignition OFF, verify that a test lamp does not illuminate between each ignition circuit terminal and ground, at the control module connector that was just disconnected.
- If the test lamp does illuminate, test the ignition circuit for a short to voltage. If the circuits test normal, replace the control module that was just disconnected.
- Ignition ON, verify that a test lamp illuminates between each ignition circuit terminal and ground.
- If the test lamp does not illuminate, test the ignition circuit for a short to ground or an open/high resistance. If the circuits test normal, replace the control module that was just disconnected.
- Ignition OFF, connect the harness connectors at the control module that was just disconnected.
- Repeat step 1 at another control module until a short to voltage, a short to ground, or an open/high resistance is found on the ignition circuits.
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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.