P0455 - Evaporative Emission System Leak Detected (Gross Leak/No Flow)

4-70 Powertrain DTC Charts and Descriptions

Diagnostic Trouble Code (DTC) Charts and Descriptions

P0455 - Evaporative Emission System Leak Detected (Gross Leak/No Flow) (Continued)

Diagnostic Aids: Check for audible vacuum noise or significant fuel odor in the engine compartment or near the EVAP canister

and fuel tank. Verify the capless fuel tank filler pipe is sealed correctly. Install and remove the supplemental fueling adapter five times in the capless fuel tank filler pipe to clear debris on the seal. Refer to the Owner Literature for the location of the supplemental fueling adapter in the vehicle.

Application Key On Engine Off Key On Engine Running Continuous Memory

All GO to Pinpoint Test HX.

P0456 - Evaporative Emission System Leak Detected (Very Small Leak)

Description: This DTC sets when a fuel vapor leak from an opening as small as 0.508 mm (0.020 inch) is detected by the

EVAP running loss monitor test.

Possible Causes: • Very small holes or cuts in the fuel vapor hoses or tubes

• Loose fuel vapor hose or tube connections to the EVAP system components

• EVAP system component seals leaking

Diagnostic Aids: Check for a missing fuel filler cap or the integrity of the cap (if equipped). Verify the capless fuel tank filler pipe is

sealed correctly (if equipped). Install and remove the supplemental fueling adapter five times in the capless fuel tank filler pipe to clear debris on the seal. Refer to the Owner Literature for the location of the supplemental fueling adapter in the vehicle. Check for loose or damaged vapor hoses. Visually inspect the EVAP canister inlet port, EVAP canister vent valve filter, and EVAP canister vent hose assembly for contamination or debris.

Application Key On Engine Off Key On Engine Running Continuous Memory

All GO to Pinpoint Test HX.

P0457 - Evaporative Emission System Leak Detected (Fuel Cap Loose/Off)

Description: The PCM continuously monitors the fuel level and retains the last updated value prior to the ignition switch

being placed in the OFF position. After the ignition switch is placed in the ON position a new fuel level is taken and compared to the level recorded at ignition OFF. If the fuel level has increased, a flag is set in the PCM indicating the vehicle was refueled. This DTC sets when the evaporative emission (EVAP) monitor detects a gross leak while the refueling flag is set and a loose fuel filler cap (if equipped) or an incorrectly sealed capless fuel tank filler pipe (if equipped) is suspected. On most vehicles, when the DTC sets, a message on the instrument panel cluster (IPC) displays to instruct the driver to check the fuel cap or capless fuel tank filler pipe (if equipped).

Possible Causes: • Damaged, missing, or loosely installed fuel filler cap (if equipped)

• Capless fuel tank filler pipe damaged or not sealed correctly (if equipped)

Diagnostic Aids: Check for a missing fuel filler cap or the integrity of the cap (if equipped). Verify the capless fuel tank filler pipe is

sealed correctly (if equipped). Install and remove the supplemental fueling adapter five times in the capless fuel tank filler pipe to clear debris on the seal. Refer to the Owner Literature for the location of the supplemental fueling adapter in the vehicle. If OK, clear the continuous memory DTCs and test the system for correct operation.

Application Key On Engine Off Key On Engine Running Continuous Memory

All GO to Pinpoint Test HX.

P0460 - Fuel Level Sensor A Circuit

Description: The PCM calculates the amount of fuel used during operation. This DTC sets when the FLI signal does not

change or does not correspond with the calculated fuel usage. For vehicles with a dual container (saddle type) fuel tank, either fuel level sensor may set this DTC.

Possible Causes: • Stuck float arm

• Fuel level is always greater than 95% due to refueling patterns

• Fuel level is always less than 5% due to refueling patterns

• Fuel level is always at the same level between 3% and 97% full due to refueling patterns

• Fuel pump (FP) module concern

• Damaged instrument panel cluster (IPC)

Diagnostic Aids: Check with the customer for driving and fueling habits that would keep the fuel level at approximately the same

value. Monitor the FLI PIDs while attempting to move the fuel level float by adding or removing fuel as necessary.

Application Key On Engine Off Key On Engine Running Continuous Memory

2016 Powertrain Control/Emissions Diagnosis, Gasoline Engines, 3/2015