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HOMESERVICE MANUALSCHEVROLET2025SUBURBAN LS, RWDREPAIR AND DIAGNOSISSUSPENSIONSUSPENSION CONTROL SYSTEMSSUSPENSION CONTROLS SYSTEMDIAGNOSTIC INFORMATION AND PROCEDURESDTC C1197CIRCUIT/SYSTEM VERIFICATION
2025 Chevrolet Suburban LS, RWD

Circuit/System Verification

2025 Chevrolet Suburban LS, RWDSECTION Circuit/System Verification
  1. Ignition ON.
  2. Verify K5 Automatic Level Control Module software is up to date.
    • If software is not up to date 

      Program the K5 Automatic Level Control Module

    • Go to next step: If software is up to date 
  3. Verify DTC C1194 is not set in the K5 Automatic Level Control Module.
    • Go to next step: If DTC is not set 
  4. Inspect the lines between the Compressor and the Air Suspension Control Module Manifold, and the intake hose for blockage or kinks.
    • If blockage or kinks are found 

      Repair as necessary.

    • Go to next step: If blockage or kinks are not found 
    5. NOTE:

    Scan tool control functions will be inhibited by any DTC present in the K5 Automatic Level Control Module. Refer to: Diagnostic Trouble Code (DTC) List - Vehicle to resolve any DTCs necessary.

  5. Using a scan tool, perform the control function Pneumatic Connection Pressure Test.
  6. Using the scan tool, perform control functions Test Compressor Pneumatic Operation.
  7. Verify the compressor runs and passes.
    • If compressor does not run, or the test fails 
    1. Test for damage, improper seating, evidence of water/ice, or leaks using soapy water on the following components:
      • Air Suspension Control Module Manifold
      • Fittings
      • Air line from the Air Suspension Control Module Manifold to the Automatic Level Control Air Supply Reservoir
      • Automatic Level Control Air Supply Reservoir
      • If damage, improper seating, evidence of water/ice, or leaks are found

        Repair damage, improper seating, evidence of water/ice, or leaks.

      • Go to next step: If no damage, improper seating, evidence of water/ice, or leaks are found
    2. Disconnect the intake hose from the G4 Automatic Level Control Air Compressor.
    3. Using a scan tool, perform the control function Pneumatic Connection Pressure Test.
    4. Using a scan tool, perform the control function Test Compressor Pneumatic Operation.
    5. Verify compressor runs and passes.
      • If the compressor does not run or the test fails

        Replace the G4 Automatic Level Control Air Compressor.

      • Go to next step: If the compressor runs and the test passes
    6. Inspect or replace the intake hose.
    • Go to next step: If compressor runs and the test passes 
  8. Clear DTCs. Operate system under the Conditions for Running the DTC.
  9. Verify DTCs do not reset.
    • If DTC sets 

      Replace the K5 Automatic Level Control Module

    • Go to next step: If the DTC does not set 
  10. All OK.
RENDER: 1.0x

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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.