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 MANUALSCHEVROLET2019TAHOE LS, 4WD, GAS/ETHANOLREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 35 (12 V STARTING AND CHARGING SYSTEM)DIAGNOSTIC INFORMATION AND PROCEDURESCHARGING SYSTEM TESTCIRCUIT/SYSTEM VERIFICATION
2019 Chevrolet Tahoe LS, 4WD, Gas/Ethanol
Circuit/System Verification
2019 Chevrolet Tahoe LS, 4WD, Gas/EthanolSECTION Circuit/System Verification
WARNING: This page is about a different car, the 2018 Chevrolet Sonic. However, it is still accessible from the selected car via links, so may be relevant.
NOTE:
Do not have a battery charger connected during the generator testing.
- Ignition ON.
- Verify that no G13 Generator, B18 Battery Current Sensor or B110 Battery Sensor Module DTCs are set that would cause a charging system concern.
- If DTCs are set
Refer to Diagnostic Trouble Code (DTC) List - Vehicle .
- Go to next step: If no DTCs are set
- If DTCs are set
- Verify the scan tool Body Control Module Battery Voltage parameter is 12 V or greater.
- If less than 12 V
Refer to Battery Inspection/Test .
- Go to next step: If 12 V or greater
- If less than 12 V
- Engine running, all accessories OFF.
- Verify the scan tool Body Control Module Battery Voltage parameter continually increases when controlling the Body Control Module Generator Regulator Setpoint from 40% to 90% with a scan tool. It may take up to 10 s for the battery voltage to stabilize between each setpoint change.
- If the battery voltage does not continually increase
Refer to Circuit/System Testing.
- Go to next step: If the battery voltage continually increases
- If the battery voltage does not continually increase
- All OK.
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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.