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Home >> Chevrolet >> 2020 >> Express 2500 LS, 6.0L Eng VIN G >> Repair and Diagnosis >> Accessories & Equipment >> Gauges & Instrument Panels >> Displays And Gauges >> Diagnostic Information and Procedures >> DTC B0158 >> Circuit/System Testing

Circuit/System Testing

  1. Ignition OFF, disconnect the ambient air temperature sensor.
  2. Ignition OFF, test for less than 1 ohm between the low reference circuit terminal B and ground.
    • If greater than the specified range, test the low reference circuit for an open/high resistance. If the circuit tests normal replace the IPC.
  3. Ignition ON, verify that OC is displayed on the DIC display.
    • If not the specified value, test the signal circuit terminal A for a short to ground. If the circuit tests normal replace the IPC.
  4. Ignition ON, install a 3 - amp fused jumper wire between the signal circuit terminal A and the low reference circuit B. Verify that SC is displayed on the DIC display.
    • If not the specified value, test the signal circuit for a short to voltage or an open/high resistance. If the circuit tests normal replace the IPC.
  5. If all circuits test normal, replace the ambient air temperature sensor.
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