SYS.OK|MANUAL.DB● LIVE
HOMESERVICE MANUALSGMC2021TERRAIN SLT, 4WDREPAIR AND DIAGNOSISELECTRICALSTARTER12 V STARTING AND CHARGING - DIAGNOSTIC INFORMATION AND PROCEDURES (1 OF 2)DIAGNOSTIC INFORMATION AND PROCEDURESPROACTIVE ALERT IDENTIFIER SAC004CIRCUIT/SYSTEM TESTING
2021 GMC Terrain SLT, 4WD

Circuit/System Testing

2021 GMC Terrain SLT, 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 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 the 500 mV drop between the 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 

      (KL9) Replace the X50D Fuse Block - Battery and continue testing voltage drop at all other cables.

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

      Replace the Starter Solenoid Cable 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. Refer to Battery Inspection/Test 
    • If 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 Battery Passes the Test 
  5. Replace the M64 Starter Motor.
  6. Clear the Proactive Alert Using the Scan Tool "Vehicle Diagnostics" - "Vehicle Proactive Alerts".
RENDER: 1.0x

NO RELATED

Recommended Tools & Savings

Use the Manual With the Right Hardware

Pair factory procedures with proven DIY tools so the instructions are easier to execute.

Affiliate disclosure: We may earn a commission at no extra cost to you.

Shop Manual-Ready ToolsFree Quote CheckQuote Shield Pro

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.