Diagnostic Test

CHECK FOR AN ACTIVE DTC
1. Start the engine and allow the engine to reach normal operating temperature.
  NOTE:
  It may be necessary to drive the vehicle to meet the conditions to set this DTC, try to repeat the conditions in which the fault originally set by reviewing the Freeze Frame data.
2. With the scan tool, read DTCs and record on the repair order.
  Is the DTC active or pending?
  
  Yes
  - Go To 2
  No
  - Perform the INTERMITTENT CONDITION diagnostic procedure. Refer to INTERMITTENT CONDITION .
CHECK IF P2067 OR P2068 IS ACTIVE OR PENDING
1. Refer to the recorded DTCs.
  Is either P2067 or P2068 active or pending?
  
  Yes
  - Perform the applicable diagnostic procedure(s). Refer to 5.7L - DIAGNOSTIC CODE INDEX .
  No
  - Go To 3
CHECK THE BCM FOR FUEL LEVEL SENSOR CIRCUIT DTCS
Are any Fuel Level Sensor Circuit DTCs set in the BCM?

Yes
- Diagnose the appropriate Fuel Level Sensor Circuit DTC in the BCM. Refer to BODY CONTROL MODULE (BCM) - DIAGNOSTIC CODE INDEX .
No
- Go To 4
PERFORM FUEL TANK EXTERNAL INSPECTION
1. Visually inspect the Fuel Tank for damage that may restrict the Secondary Fuel Level Sensor float from moving.
  Were any problems found?
  
  Yes
  - Replace the Fuel Tank in accordance with the Service Information. Refer to TANK, FUEL, REMOVAL .
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
  No
  - Go To 5
PERFORM FUEL TANK INTERNAL INSPECTION
WARNING:
The fuel system is under a constant pressure (even with the engine off). Before testing or servicing any fuel system hose, fitting or line, the fuel system pressure must be released. Failure to follow these instructions can result in possible serious or fatal injury.
1. Remove the Fuel Tank in accordance with the Service Information. Refer to TANK, FUEL, REMOVAL .
2. Remove the Secondary Fuel Pump Module.
3. Visually inspect the inside of the Fuel Tank for any obstructions or deformities.
4. Inspect the Secondary Fuel Pump Module siphon tube and Float arm for damage.
  Were any problems found?
  
  Yes
  - Repair or replace as necessary.
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
  No
  - Go To 6
CHECK RELATED HARNESS CONNECTIONS
1. Using the wiring diagram/schematic as a guide, inspect the wiring and connectors between the Fuel Pump Module and the BCM.
2. Look for any chafed, pierced, pinched, or partially broken wires.
3. Look for broken, bent, pushed out or corroded terminals. Verify that there is good pin to terminal contact in the Fuel Pump Module and the BCM harness connectors.
4. Perform any Service Bulletins that may apply.
  Were any problems found?
  
  Yes
  - Repair as necessary.
  - Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .
  No
  - Replace the Body Control Module in accordance with the Service Information. Refer to MODULE, BODY CONTROL (BCM), REMOVAL .
  - Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .