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 MANUALSGMC2022SIERRA 1500 SLT, 6.2L ENG VIN LREPAIR AND DIAGNOSISENGINE MECHANICALSTARTERBATTERY, STARTING SYSTEM AND CHARGING SYSTEM - DIAGNOSTIC INFORMATION AND PROCEDURES (1 OF 2)DIAGNOSTIC INFORMATION AND PROCEDURESDTC U3003CIRCUIT/SYSTEM VERIFICATION
2022 GMC Sierra 1500 SLT, 6.2L Eng VIN L
Circuit/System Verification
2022 GMC Sierra 1500 SLT, 6.2L Eng VIN LSECTION Circuit/System Verification
- Ignition "OFF", measure and record the battery voltage at the battery terminals.
- Verify the battery voltage stabilizes between 12.4 V and 12.8 V within a few minutes of ignition "OFF".
- If battery voltage is less than 12.4 V or more than 12.8 V
refer to Battery Inspection/Test .
- Go to next step: If battery voltage is between 12.4 V and 12.8 V
- If battery voltage is less than 12.4 V or more than 12.8 V
- Vehicle in Propulsion Mode, headlights ON, measure and record the battery voltage at the battery terminals.
- Verify the voltage is at least 1 V greater than the voltage measured in step 1, but less than 15 V.
- If the voltage is not at least 1 V greater than the voltage measured in step 1 or is greater than 15 V
Refer to Charging System Test .
- Go to next step: If the voltage is at least 1 V greater than the voltage measured in step 1, but less than 15 V
- If the voltage is not at least 1 V greater than the voltage measured in step 1 or is greater than 15 V
- Verify the appropriate control module battery voltage and ignition voltage parameters are available in the scan tool.
- If parameters are not available in the scan tool
Refer to "Circuit/System Testing".
- Go to next step: If parameters are available in the scan tool
- If parameters are not available in the scan tool
- Verify the appropriate control module scan tool battery voltage and ignition voltage parameters are within 1 V of the battery voltage.
- If not within 1 V of the battery voltage
Refer to "Circuit/System Testing".
- Go to next step: If within 1 V of the battery voltage
- If not within 1 V of the battery voltage
- The condition may be an intermittent fault and is not currently present.
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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.