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.
4-16 Powertrain DTC Charts and Descriptions
Diagnostic Trouble Code (DTC) Charts and Descriptions
P0087 - Fuel Rail/System Pressure - Too Low (Continued)
All others GO to Pinpoint Test HP.
P0088 - Fuel Rail/System Pressure - Too High
For Mustang, 5.2L
Description: This DTC sets when the fuel rail pressure requested by the PCM is less than the fuel rail pressure delivered, by
more than a calibrated threshold for greater than a calibrated length of time.
Possible Causes: • High fuel pressure
• FRP circuit concerns
• Damaged FRP sensor
Diagnostic Aids:
For All Others
Description: The PCM regulates the fuel rail pressure by controlling the fuel volume regulator. This DTC sets when the PCM
is no longer capable of maintaining the fuel pressure within the calibrated parameters.
Possible Causes: • Damaged fuel injection pump
Diagnostic Aids:
Application Key On Engine Off Key On Engine Running Continuous Memory
Mustang 5.2L GO to Pinpoint Test DD.
All others GO to Pinpoint Test HP.
P008A - Low Pressure Fuel System Pressure - Too Low
Description: This DTC sets when the low pressure fuel system pressure falls below an expected threshold.
Possible Causes: • Low or no fuel
• Low fuel pressure
• Damaged fuel pressure sensor
Diagnostic Aids:
Application Key On Engine Off Key On Engine Running Continuous Memory
All GO to Pinpoint Test HC.
P008B - Low Pressure Fuel System Pressure - Too High
Description: This DTC sets when the low pressure fuel system pressure rises above an expected threshold.
Possible Causes: • High fuel pressure
• Damaged fuel pressure sensor
Diagnostic Aids:
Application Key On Engine Off Key On Engine Running Continuous Memory
All GO to Pinpoint Test HC.
P0093 - Fuel System Leak Detected - Large Leak
Description: This DTC sets when the PCM detects an air leak that exceeds a calibrated limit for greater than 5 seconds. If
the airflow entering the engine exceeds the airflow through the throttle, a leak is detected.
Possible Causes: • Unmetered air leaks between throttle body and intake valves
• Air leaks at the intake manifold
• Positive crankcase ventilation (PCV) system is leaking
Diagnostic Aids: Verify the integrity of the PCV system. Refer to Section 1, Positive Crankcase Ventilation (PCV) System for
system information.
Application Key On Engine Off Key On Engine Running Continuous Memory
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.