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HOMESERVICE MANUALSCHEVROLET2025SUBURBAN LS, RWDREPAIR AND DIAGNOSISSUSPENSIONSUSPENSION CONTROL SYSTEMSSUSPENSION CONTROLS SYSTEMDIAGNOSTIC INFORMATION AND PROCEDURESDTC C1194CIRCUIT/SYSTEM VERIFICATION
2025 Chevrolet Suburban LS, RWD

Circuit/System Verification

2025 Chevrolet Suburban LS, RWDSECTION Circuit/System Verification
  1. Ignition ON.
    2. 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.

  2. Using a scan tool, perform the control function Pneumatic Connection Pressure Test.
  3. Verify Pneumatic Connection Pressure Test passes and reservoir pressure is 4 - 20 bar.
    • If test fails or pressure is not 4 - 20 bar 
      1. Recharge the Automatic Level Control Air Supply Reservoir to 15 bar.
      2. 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 
      3. Replace the Air Suspension Control Module Manifold
    • Go to next step: If test passes and pressure is 4 - 20 bar 
  4. Clear DTCs. Operate system under the Conditions for Running the DTC.
  5. 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 
  6. 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.