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HOMESERVICE MANUALSCHEVROLET2019TAHOE LS, 4WD, GAS/ETHANOLREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 72 (DATA COMMUNICATION SYSTEM)DIAGNOSTIC INFORMATION AND PROCEDURESDTC U2101CIRCUIT/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.
  1. Ignition ON/Vehicle In Service Mode.
  2. Verify DTC U2101 is not set.
    • If DTC U2101 is set without other DTCs set 
    1. Program the device that sets the DTC.
    2. Clear the DTC.
    3. Ignition/Vehicle OFF, remove the scan tool, open and close the driver door. Wait 60 s.
    4. Verify the DTC does not set.
      • If the DTC sets, replace the appropriate device.
      • Go to next step: If the DTC does not set
    5. All OK.
    • Go to next step: If DTC U2101 is not set 
  3. 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.