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Fuel Gauge Not Operating Properly

NOTE: After making any repairs, perform BODY VERIFICATION TEST  under VERIFICATION TESTS.
  1. Perform self-test on instrument cluster. Press and hold TRIP/RESET button and turn ignition on. All gauges should move through entire range ending in lowest position. If fuel gauge does not operate as specified, replace instrument cluster. See INSTRUMENT CLUSTER  under REMOVAL & INSTALLATION. If fuel gauge operates as specified, turn ignition off and go to next step.
  2. Turn ignition on. Observe fuel gauge and disconnect fuel pump module Light Gray 4-pin connector located in center rear of trunk. If fuel gauge goes to empty, replace fuel sending unit. If fuel gauge does not return to empty, go to next step.
  3. Reconnect fuel pump module connector. Using scan tool, select BODY COMPUTER then SENSORS. Observe FUEL SENSOR voltage on scan tool while disconnecting fuel pump module connector. If voltage is more than 6 volts, replace instrument cluster. If voltage is 6 volts or less, go to next step.
  4. Turn ignition off. Ensure fuel pump module is disconnected. Disconnect Body Control Module (BCM) Gray C4 26-pin connector. BCM is connected to junction block under left side of instrument panel. Measure resistance between ground and terminal No. 22 (Dark Blue wire) at BCM C4 harness connector. See Figure . If resistance is 5 ohms or more, go to next step. If resistance is less than 5 ohms, repair short to ground in Dark Blue wire.
  5. Measure resistance between Dark Blue and Black wires at fuel pump module harness connector. If resistance is less than 5 ohms, Dark Blue and Black wires are shorted together. Repair wiring as necessary. If resistance is 5 ohms or more than, replace BCM.
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