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Home >> Chevrolet >> 2012 >> Volt >> Repair and Diagnosis >> Accessories & Equipment >> Gauges & Instrument Panels >> Instrument Panel System Displays And Gauges >> Diagnostic Information and Procedures >> Fuel Gauge Malfunction - DTC P0461-P0464 >> Circuit/System Testing

Circuit/System Testing

  1. Vehicle OFF, disconnect the harness connector at the B46 fuel level sensor.
  2. Test for less than 10 Ω at the low reference circuit terminal 3.
    • If greater than the specified range, test the low reference circuit for an open/high resistance. If the circuit tests normal, replace the K20 Engine Control Module.
  3. Vehicle in Service Mode, test for 4.8-5.2 V between the signal circuit terminal 4 and ground.
    • If greater than the specified range, test the signal circuit for a short to voltage. If the circuit tests normal, replace the K20 ECM.
    • If less than the specified range, test the signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the K20 ECM.
  4. If all circuits test normal, replace the B46 fuel level sensor.
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