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DTC P0463: Fuel Level Sending Unit Volts Too High

NOTE: For connector terminal ID, see CONNECTOR IDENTIFICATION  .
NOTE: Fuel level sending unit may also be referred to as fuel level sensor. Fuel level sending unit voltage is monitored when ignition is on. DTC may be stored in Powertrain Control Module (PCM) if fuel level sending unit circuit voltage at Body Control Module (BCM) increases to more than 4.5 volts. Possible causes are; defective fuel level sending unit, defective BCM, or defective connectors or wiring
  1. Turn ignition on with engine off. Using scan tool, check for DTCs. If GLOBAL GOOD TRIP counter is displayed and equal to zero, go to next step. If GLOBAL GOOD TRIP counter is not displayed and equal to zero, go to step  8 .
  2. Turn ignition off. Disconnect fuel pump module connector. Fuel pump module contains fuel pump, fuel level sending and is located on top of fuel tank. Fuel pump module connector is located inside the trunk, below carpet, next to driver's side strut tower. See Figure .
  3. Connect jumper wire between terminals No. 2 (Dark Blue wire) and No. 4 (Black/Light Green wire) on fuel pump module connector. Turn ignition on with engine off. Using scan tool, read FUEL LEVEL SENSOR voltage on scan tool. If FUEL LEVEL SENSOR voltage is less than one volt, remove jumper wire and go to next step. If FUEL LEVEL SENSOR voltage is one volt or more, remove jumper wire and go to step  5 .
  4. Remove fuel tank and inspect the short wiring harness that goes to fuel pump module. This wiring harness fits between fuel pump module and fuel pump module connector located inside the trunk, below carpet, next to driver's side strut tower. If short wiring harness is okay, replace fuel level sending unit. Perform TEST VER-2A  . If short wiring harness is defective, replace fuel pump module. Perform TEST VER-2A  .
  5. Using ohmmeter, check resistance between ground and terminal No. 4 (Black/Light Green wire ) on fuel pump module connector. If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open on Black/Light Green wire between fuel pump module and ground connection. This wire is a Black/Light Green wire at fuel pump module connector and changes to a Black wire at connector located near trunk lid and then goes to ground connection near center of trunk lid. Perform TEST VER-2A  .
  6. Ensure ignition is off. Disconnect BCM connector C5. The BCM is located on rear of junction block at driver's side of instrument panel. BCM connector C5 is a Black 20-pin connector. See Figure .
  7. Using ohmmeter, check resistance between terminal No. 2 (Dark Blue wire) on fuel pump module connector and terminal No. 15 (Dark Blue wire) on BCM connector C5. If resistance is 5 ohms or more, replace BCM. Reprogram BCM. See BODY CONTROL MODULE  under PROGRAMMING. Perform TEST VER-2A  . If resistance is less than 5 ohms, repair open on Dark Blue wire between BCM and fuel level sending unit. Perform TEST VER-2A  .
  8. Turn ignition off. Inspect Dark Blue wire and connectors between fuel level sending unit on fuel pump module and terminal No. 15 (Dark Blue wire) on BCM connector C5. The BCM is located on rear of junction block at driver's side of instrument panel. BCM connector C5 is a Black 20-pin connector. See Figure . Fuel pump module contains fuel pump, fuel level sending and is located on top of fuel tank. Fuel pump module connector is located inside the trunk, below carpet, next to driver's side strut tower. See Figure . If no problems exist, go to next step. If any problems exist, repair wiring or connectors as necessary. Perform TEST VER-2A  .
  9. Turn ignition on with engine off. Using scan tool, read FUEL LEVEL SENSOR voltage while wiggling wiring harness and connectors between BCM connector C5 and fuel level sending unit. If FUEL LEVEL SENSOR voltage does not change while wiggling wiring harness and connectors, test is complete. If FUEL LEVEL SENSOR voltage changes while wiggling wiring harness and connectors, repair wiring or connectors as necessary. Perform TEST VER-2A  .
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