Diagnostic Test

WARNING: This page is about a different car, the 2019 RAM 3500 HD and 2019 RAM 2500 HD. However, it is still accessible from the selected car via links, so may be relevant.

CHECK FOR AN ACTIVE DTC
1. Turn the ignition on.
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 .
VERIFY THAT THE BODY CONTROL MODULE IS CAPABLE OF SETTING FUEL LEVEL SENSOR FAULTS
1. Check the BCM fault code list to verify that the BCM has the capability to set DTCs against the Fuel Level Sensor. Refer to DIAGNOSTIC CODE INDEX .
  Are there any Fuel Level Sensor faults listed in the DTC list for the BCM?
  
  Yes
  - Go To 3
  No
  - Go To 4
CHECK THE BODY CONTROL MODULE FOR FUEL LEVEL SENSOR FAULTS
1. With the scan tool, read DTCs in the BCM.
  Is the BCM setting any DTCs against the Fuel Level Sensor?
  
  Yes
  - Perform the diagnostic procedure in the BCM. Refer to DIAGNOSTIC CODE INDEX .
  No
  - Replace and program the Body Control Module (BCM) in accordance with the Service Information. Refer to MODULE, BODY CONTROL (BCM), REMOVAL AND INSTALLATION .
CHECK THE FUEL LEVEL SENSOR WIRING
1. Turn the ignition off.
2. Disconnect the Fuel Level Sensor harness connector.
3. Disconnect the appropriate BCM harness connector.
4. Check the Fuel Level Sensor wires:
  - For an open condition.
  - For a short to voltage.
  - For a short to ground.
  - For a short to each other.
  Were any problems found with the wiring?
  
  Yes
  - Perform the appropriate repair of the wiring.
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
  No
  - Go To 5
REPLACE THE FUEL LEVEL SENSOR AND RETEST FOR DTCS
1. Replace the Fuel Level Sensor in accordance with the Service Information. Refer to and MODULE, FUEL PUMP, REMOVAL AND INSTALLATION .
2. Reconnect all harness connectors.
3. Turn the ignition on.
4. With the scan tool, read DTCs and record on the repair order.
  Is the DTC still active?
  
  Yes
  - Replace and program the Body Control Module (BCM) in accordance with the Service Information. Refer to MODULE, BODY CONTROL (BCM), REMOVAL AND INSTALLATION .
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
  No
  - Replacing the Fuel Level Sensor repaired the fault.
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .