Diagnostic Aids

Check for incorrect type fuel filler cap, cracked or punctured EVAP canister, damaged or disconnected source vacuum line, EVAP purge line, vent hose, or fuel tank vapor line. A Faulty or erratic fuel tank pressure sensor can cause DTC P0455 to set.

If a DTC P0455 is intermittent, driving the vehicle under the conditions outlined in the Inspection/Maintenance (I/M) section can verify whether the fault is present. Refer to INSPECTION/MAINTENANCE EVAP SYSTEM SET PROCEDURE  under INSPECTION/MAINTENANCE PROCEDURES. The diagnostic may take up to 20 minutes to complete.

A faulty or erratic fuel level sensor can cause DTC P0455 to set. Use the scan tool in order to check the operation of the fuel level sensor. If the accuracy of the fuel level sensor is suspect, refer to DTC P0461 in appropriate INSTRUMENT PANELS article in ACCESSORIES & EQUIPMENT article.

An intermittent malfunction may be caused by a fault in any of the EVAP control system electrical circuits. Inspect the wiring harness and components for an intermittent condition. See INTERMITTENTS in TROUBLE SHOOTING - NO CODES - 2.0L & 2.5L TRACKER article. If DTC P0455 cannot be duplicated, the information included in the Freeze Frame data can be useful in determining vehicle operating conditions when the DTC was first set.