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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 TESTING
2022 GMC Sierra 1500 SLT, 6.2L Eng VIN L

Circuit/System Testing

2022 GMC Sierra 1500 SLT, 6.2L Eng VIN LSECTION Circuit/System Testing
  1. Ignition "OFF" and all vehicle systems OFF, disconnect the harness connectors at the appropriate control module that is setting the DTC. It may take up to 2 min for all vehicle systems to power down.
  2. Test for less than 10 Ω between each ground circuit terminal and ground.
    • If 10 Ω or greater 
    1. ignition "OFF".
    2. Test for less than 2 Ω in the ground circuit end to end.
      • If the measured resistance is 2 Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2 Ω, repair the open/high resistance in the ground connection.
    • Go to next step: If less than 10 Ω 
  3. Vverify a test lamp illuminates between each B+ circuit terminal and ground.
    • If the test lamp does not illuminate and the circuit fuse is good 
    1. ignition "OFF".
    2. Test for less than 2 Ω in the B+ circuit end to end.
      • If the measured resistance is 2 Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2 Ω, verify the fuse is not open and there is voltage at the fuse.
    • If the test lamp does not illuminate and the circuit fuse is open 
    1. ignition "OFF".
    2. Test for infinite resistance between the B+ circuit and ground.
      • If the measured resistance is not infinite, repair the short to ground in the circuit.
      • If the measured resistance is infinity, replace the corresponding control module.
    • Go to next step: If the test lamp is ON 
    4. NOTE:

    If the component is not equipped with an ignition circuit proceed to Step 6.

  4. Ignition "ON".
  5. If equipped, verify a test lamp illuminates between each ignition circuit terminal and ground.
    • If the test lamp does not illuminate and the circuit fuse is good 
    1. Ignition "OFF".
    2. Test for less than 2 Ω in the ignition circuit end to end.
      • If the measured resistance is 2 Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2 Ω, verify the fuse is not open and there is voltage at the fuse.
    • If the test lamp does not illuminate and the circuit fuse is open 
    1. Ignition "OFF".
    2. Test for infinite resistance between the ignition circuit and ground.
      • If the measured resistance is not infinite, repair the short to ground in the circuit.
      • If the measured resistance is infinity, replace the corresponding control module.
    • Go to next step: If the test lamp is ON 
  6. Replace the appropriate control module.
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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.