LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Jeep >> 2021 >> Cherokee Trailhawk >> Repair and Diagnosis >> Engine Performance >> System >> 3.2L - DTCS P1239 To P2115 >> DTC Troubleshooting >> P2068-Fuel Level Sensor 2 Circuit High >> Diagnostic Test
April 5, 2026: LEMON Manuals is launched! Read the announcement.

Diagnostic Test

  1. 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  3

      No 

      • Go To  2
  2. MONITOR THE SECONDARY FUEL LEVEL SENSOR VOLTAGE READING FOR AN OPEN SPOT ON THE SENSOR 
    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. Drain the fuel tank in accordance with the Service Information. Refer to DRAINING FUEL TANK .
      NOTE:

      When the Fuel Tank is completely empty, the Fuel Level Sensors should read at or near empty (indicated by a voltage reading of approximately 4.3-4.5 volts).

      NOTE:

      Make sure that you have enough fuel to put back into the vehicle to make a good determination of the Fuel Level Sensor 2 voltage feedback. It may be necessary to add more fuel to what was removed in order to do so. Keep in mind that the primary side of the tank must fill completely before fuel starts to flow over to the secondary tank.

    2. Turn the ignition on.
    3. While monitoring the Fuel Level Sensor voltage reading on scan tool, begin putting fuel back into the Fuel Tank.
      NOTE:

      The Primary Fuel Level Sensor voltage should decrease as fuel is added until it reaches near full. As fuel starts to overflow to the secondary tank, the Secondary Fuel Level Sensor voltage should also start to decrease at a steady rate. Watch for the Secondary Fuel Level Sensor voltage to change drastically while fuel is being added. If the voltage suddenly changes to or near 5.0 volts, it would indicate a bad spot (open) on that portion of the sensor.

      Did the Secondary Fuel Level Sensor reading suddenly change to 5.0 volts at any time while adding fuel?

      Yes 

      No 

  3. CHECK THE (N5) FUEL LEVEL SENSOR 2 SIGNAL CIRCUIT FOR A SHORT TO VOLTAGE 
    1. Turn the ignition off.
    2. Disconnect the Fuel Level Sensor harness connector.
    3. Turn the ignition on.
    4. Measure the voltage on the (N5) Fuel Level Sensor 2 Signal circuit at the Fuel Level Sensor harness connector.

      Is the voltage above 5.2 volts?

      Yes 

      • Repair the (N5) Fuel Level Sensor 2 Signal circuit for a short to voltage.
      • Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .

      No 

      • Go To  4
  4. CHECK THE (N5) FUEL LEVEL SENSOR 2 SIGNAL CIRCUIT FOR AN OPEN/HIGH RESISTANCE 
    1. Turn the ignition off.
    2. Disconnect the BCM harness connector.
    3. Measure the resistance of the (N5) Fuel Level Sensor 2 Signal circuit between the Fuel Level Sensor harness connector and the BCM harness connector.

      Is the resistance below 3.0 Ohms?

      Yes 

      • Go To  5

      No 

      • Repair the (N5) Fuel Level Sensor 2 Signal circuit for an open or high resistance.
      • Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
  5. CHECK THE (G109) FUEL LEVEL SENSE RETURN CIRCUIT FOR AN OPEN/HIGH RESISTANCE 
    1. Measure the resistance of the (G109) Fuel Level Sense Return circuit between the Fuel Level Sensor harness connector and the BCM harness connector.

      Is the resistance below 3.0 Ohms?

      Yes 

      • Go To  6

      No 

      • Repair the (G109) Fuel Level Sense Return circuit for an open or high resistance.
      • Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
  6. CHECK THE ABILITY OF THE BCM TO READ THE FUEL LEVEL SENSOR 2 SIGNAL 
    1. Reconnect the BCM harness connector.
    2. Connect a jumper between the (N5) Fuel Level Sensor 2 Signal circuit and the (G109) Fuel Level Sense Return circuit at the Fuel Level Sensor harness connector.
    3. Turn the ignition on.
    4. With the scan tool, read DTCS.
      NOTE:

      The P2067-FUEL LEVEL SENSOR CIRCUIT LOW DTC should be active or pending with the jumper in place.

      Does the scan tool display as described above?

      Yes 

      No 

      • Go To  7
  7. CHECK RELATED HARNESS CONNECTIONS 
    1. Disconnect all BCM harness connectors.
    2. Disconnect all related in-line harness connections (if equipped).
    3. Disconnect the related component harness connectors.
    4. Inspect harness connectors, component connectors, and all male and female terminals for the following conditions:
      • Proper connector installation.
      • Damaged connector locks.
      • Corrosion.
      • Other signs of water intrusion.
      • Weather seal damage (if equipped).
      • Bent terminals.
      • Overheating due to a poor connection (terminal may be discolored due to excessive current draw).
      • Terminals that have been pushed back into the connector cavity.
      • Check for spread terminals and verify proper terminal tension.

      Repair any conditions that are found.

    5. Reconnect all BCM harness connectors. Be certain that all harness connectors are fully seated and the connector locks are fully engaged.
    6. Reconnect all in-line harness connectors (if equipped). Be certain that all connectors are fully seated and the connector locks are fully engaged.
    7. Reconnect all related component harness connectors. Be certain that all connectors are fully seated and the connector locks are fully engaged.
    8. With the scan tool, erase DTCs.
    9. Test drive or operate the vehicle in accordance with the when monitored and set conditions.
    10. With the scan tool, read DTCs.

      Did the DTC return?

      Yes 

      No 

      • The wiring or poor connection problem has been repaired.
      • Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .
scientia non olet · About LEMON Manuals