Vehicle applicability: This diagnostic supplement covers multiple Ford vehicles and engines. Follow the application named in the source below. Some references apply to vehicles other than Mustang.
Powertrain DTC Charts and Descriptions 4-69
Diagnostic Trouble Code (DTC) Charts and Descriptions
P0452 - Evaporative Emission System Pressure Sensor/Switch Low
Description: This DTC sets when the fuel tank pressure (FTP) sensor signal average drops below a minimum allowable
calibrated parameter.
Possible Causes: • Contamination internal to the FTP sensor connector
• FTP circuit open
• VREF circuit open
• FTP circuit short to ground
• FTP circuit short to SIGRTN
• Damaged FTP sensor
Diagnostic Aids: An FTP voltage PID reading less than 0.22 volt in ignition ON, engine OFF or ignition ON, engine running
indicates a concern is present.
Application Key On Engine Off Key On Engine Running Continuous Memory
All GO to Pinpoint Test HX.
P0453 - Evaporative Emission System Pressure Sensor/Switch High
Description: This DTC sets when the fuel tank pressure (FTP) sensor signal average jumps above a minimum allowable
calibrated parameter.
Possible Causes: • Contamination internal to the FTP sensor connector
• FTP circuit open
• FTP circuit short to voltage
• VREF circuit short to voltage
• SIGRTN circuit open
• Damaged FTP sensor
Diagnostic Aids: An FTP voltage PID reading greater than 4.85 volts with the ignition ON, engine OFF or with the ignition ON,
engine running, indicates a concern is present.
Application Key On Engine Off Key On Engine Running Continuous Memory
All GO to Pinpoint Test HX.
P0454 - Evaporative Emission System Pressure Sensor/Switch Intermittent
Description: This DTC sets when the fuel tank pressure changes greater than 14 inches of water in 0.10 seconds.
Possible Causes: • FTP circuit intermittent open
• FTP circuit intermittent short
• FTP sensor intermittent open
• FTP sensor intermittent short
• Contaminated FTP sensor
• Damaged FTP sensor
Diagnostic Aids: Monitor the FTP PID and note if it changes from greater than 15 inches of water to less than minus (-) 15 inches
of water often in 1 minute.
Application Key On Engine Off Key On Engine Running Continuous Memory
All GO to Pinpoint Test HX.
P0455 - Evaporative Emission System Leak Detected (Gross Leak/No Flow)
Description: The PCM monitors the complete evaporative emission (EVAP) control system for no purge flow, the presence of
a large fuel vapor leak, or multiple small fuel vapor leaks. This DTC sets when no purge flow, which is attributed to fuel vapor blockages or restrictions, a large fuel vapor leak, or multiple fuel vapor leaks are detected by the EVAP running loss monitor test with the engine running, but not at idle.
Possible Causes: • Damaged, missing or loosely installed fuel filler cap (if equipped)
• Aftermarket EVAP hardware that does not conform to the required specifications
• Disconnected or cracked fuel EVAP canister tube, EVAP canister purge outlet tube, or EVAP return tube
• EVAP purge valve stuck closed
• Capless fuel tank filler pipe damaged or not sealed correctly (if equipped)
• Blockages or restrictions in the fuel vapor hoses or tubes
• Loose fuel vapor hose or tube connections to the EVAP system components
• EVAP canister vent valve stuck open
• Damaged fuel tank pressure (FTP) sensor
• Damaged EVAP canister
2016 Powertrain Control/Emissions Diagnosis, Gasoline Engines, 3/2015
2016 Mustang workshop publication supplied to Mustang Atlas. Original technical text and illustrations; HTML formatting by Mustang Atlas. Source page numbering is retained for traceability. Follow the configuration, revision, warnings, and cross-references in the material. About this edition.