Circuit/System Verification

Without UDV

1. Ignition ON.
2. Verify the DTC P0461, P0462, P0463, P0464, P2066, P2067, or P2068 are not set
   • If DTC P0461, P0462, P0463, or P0464 are set 

     Refer to Primary Fuel Level Sensor Malfunction in Circuit/System Testing

   • If DTC P2066, P2067, or P2068 are set 

     Refer to Secondary Fuel Level Sensor Malfunction in Circuit/System Testing

3. Verify the fuel level gauge sweeps when performing the scan tool Instrument Cluster Gauge Sweep control function.
   • If the fuel level gauge does not sweep 

     Replace the P16 Instrument Cluster

   • Go to next step: If the fuel level gauge sweeps 
4. Verify the low fuel level indicator turns ON and OFF when commanding the scan tool All Indicators control function ON and OFF.
   • If the low fuel level indicator does not turn ON and OFF 

     Replace the P16 Instrument Cluster

   • Go to next step: If the low fuel level indicator turns ON and OFF 
5. If equipped, verify the ECM scan tool Fuel Level Sensor Left Tank parameter is between 0.5 - 3.5 V and varies with fuel level.
   • If not between 0.5 - 3.5 V or does not vary with fuel level 

     Refer to Primary Fuel Level Sensor Malfunction in Circuit/System Testing

   • Go to next step: If between 0.5 - 3.5 V and varies with fuel level 
6. Verify the ECM scan tool Right Fuel Level Sensor parameter is between 0.5 - 3.5 V and varies with fuel level.
   • If not between 0.5 - 3.5 V or does not vary with fuel level 

     Refer to Secondary Fuel Level Sensor Malfunction in Circuit/System Testing

   • Go to next step: If between 0.5 - 3.5 V and varies with fuel level 
7. All OK.

With UHS or UDV

1. Ignition ON.
2. Verify the ECM scan tool Fuel Level Sensor Left Tank parameter is between 0.5 - 3.5 V and varies with fuel level.
   • If not between 0.5 - 3.5 V or does not vary with fuel level 

     Refer to Primary Fuel Level Sensor Malfunction in Circuit/System Testing

   • Go to next step: If between 0.5 - 3.5 V and varies with fuel level 
3. Verify the ECM scan tool Right Fuel Level Sensor parameter is between 0.5 - 3.5 V and varies with fuel level.
   • If not between 0.5 - 3.5 V or does not vary with fuel level 

     Refer to Secondary Fuel Level Sensor Malfunction in Circuit/System Testing

   • Go to next step: If between 0.5 - 3.5 V and varies with fuel level 
4. All OK.