P0460

Circuit Description
The Powertrain Control Module (PCM) uses the fuel level input to calculate expected vapor pressures within the fuel system. These vapor pressures vary as the fuel level changes. The vapor pressure importance is critical to determining if the Evaporative Emissions System is operating properly. Fuel level is also used to determine if the fuel level is too high or too low to be able to accurately detect EVAP system failures.

Conditions for Setting the DTC
- Fuel level hasn't changed more than 1.6% (4 counts) in 120 miles
- A DTC P1601 is set and the vehicle has been driven more than 120 miles

Action Taken When the DTC Sets
- The PCM will record operating conditions at the time the diagnostic fails. This information will be stored in the Freeze Frame and Failure Records buffers.
- A history DTC is stored.
- The fuel tank level will default to 40%.

Conditions for Clearing the DTC
- A history DTC will clear after 40 consecutive warm up cycles without a fault.
- DTCs can be cleared by using a scan tool.

Diagnostic Aids
Whenever a DTC P0460 is set along with an EVAP System DTC, the EVAP DTC can not be considered valid until DTC P0460 is repaired and cleared.

DTC P0460 - Fuel Level Sensor Circuit:

Test Description
Numbers below refer to the step numbers on the Diagnostic Table.
1. The OBD System Check prompts the Technician to complete some basic checks and store the Freeze Frame Data and the Failure records on the scan tool if applicable. This creates an electronic copy of the data taken when the fault occurred. This information on the scan tool can be referred to later.
3. The fuel level sensor is diagnosed.
4. Repair verification is an important step in any diagnostic procedure. Comparing the fuel level readings before and after the repairs is a good way to determine if a repair has been successful.