Diagnostic Test
WARNING: This page is about a different car, the 2017 RAM 2500 HD. However, it is still accessible from the selected car via links, so may be relevant.
- VISUALLY INSPECT FUEL TANK NOTE:
Diagnose and repair any CAN bus, communication or implausible signal DTCs before proceeding with this test.
NOTE:Diagnose P2067 or P2068 first, if set along with P2066.
- Visually inspect the Auxiliary Fuel Tank for damage that may restrict the Auxiliary Fuel Sending Unit float from moving.
Is the Auxiliary Fuel Tank OK?
Yes
- Go To 2
No
- Replace the Auxiliary Fuel Tank in accordance with the service information.
- Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
- Visually inspect the Auxiliary Fuel Tank for damage that may restrict the Auxiliary Fuel Sending Unit float from moving.
- FUEL LEVEL SENSOR CIRCUIT DTCS SET IN THE BCM
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 DTC INDEX - 2500 HD .
No
- Go To 3
- INTERNAL INSPECTION OF THE AUXILIARY FUEL TANK 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.
- Remove the Auxiliary Fuel Tank in accordance with the Service Information.
- Remove the Auxiliary Fuel Pump Module.
- Visually inspect the inside of the Auxiliary Fuel Tank for any obstructions or deformities.
- Inspect the Auxiliary Fuel Pump Module 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 4
- POWERTRAIN CONTROL MODULE (PCM)
- Using the wiring diagram/schematic as a guide, inspect the wiring and connectors between the Body Control Module (BCM) and the Powertrain Control Module (PCM).
- Look for any chafed, pierced, pinched or partially broken wires.
- Look for broken, bent, pushed out or corroded terminals. Verify that there is good pin to terminal contact in the Auxiliary Fuel Sending Unit Sensor and Powertrain Control Module harness connectors.
- Perform any Technical Service Bulletins that may apply.
Were there any problems found?
Yes
- Repair as necessary.
- Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
No
- Replace and program the Powertrain Control Module in accordance with the service information. Refer to MODULE, POWERTRAIN CONTROL, REMOVAL .
- Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .