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HOMESERVICE MANUALSCHEVROLET2025TAHOE COMMERCIAL, 4WDREPAIR AND DIAGNOSIS (SINGLE PAGE)ELECTRICALCHARGING SYSTEMSBATTERY, STARTING SYSTEM AND CHARGING SYSTEM - DIAGNOSTIC INFORMATION AND PROCEDURESDIAGNOSTIC INFORMATION AND PROCEDURESPROACTIVE ALERT IDENTIFIER SAC002CIRCUIT/SYSTEM TESTING
2025 Chevrolet Tahoe Commercial, 4WD

Circuit/System Testing

2025 Chevrolet Tahoe Commercial, 4WDSECTION Circuit/System Testing
  1. Test for the following values at each test location:
    • Test for less than the 500 mV drop between the C1 Battery Positive Post and the X50D Fuse Block - Battery with the ignition in CRANK/START.
    • Test for less than 500 mV drop between X50D Fuse Block - Battery and terminal A X2 at the M64 Starter Motor with the ignition in CRANK/START.
    • Test for less than 500 mV drop between negative battery cable and the M64 Starter Motor Case with the ignition in CRANK/START.
    • If 500 mV or greater between the C1 Battery Positive Post and the X50D Fuse Block - Battery 

      Replace the X50D Fuse Block - Battery and continue testing voltage drop at all other cables.

    • If 500 mV or greater between at the X50D Fuse Block - Battery and terminal A X2 at the M64 Starter Motor 

      Replace the battery starter cable between the X50D Fuse Block - Battery and M64 Starter Motor and continue testing voltage drop at all other cables.

    • If 500 mV or greater between negative battery cable and the M64 Starter Motor Case 

      Replace the Battery Negative Cable. and continue testing voltage drop at all other cables.

  2. Clear the Proactive Alert Using the Scan Tool "Vehicle Diagnostics" - "Vehicle Proactive Alerts".
    • Go to next step: If all tests are less than the specific value 
  3. Test the Battery. Refer to Battery Inspection/Test 
    • If the C1 Battery Fails the Test

      Replace the C1 Battery

  4. Clear the Proactive Alert Using the Scan Tool "Vehicle Diagnostics" - "Vehicle Proactive Alerts".
    • Go to next step: If the C1 Battery Passes the Test
  5. The condition is currently not present and may be an intermittent fault.
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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.