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.
4-48 Powertrain DTC Charts and Descriptions
Diagnostic Trouble Code (DTC) Charts and Descriptions
P027B - Fuel Pump Module Control Circuit Range/Performance
Description: The fuel pump control module 2 monitors the duty cycle and frequency of the signal it receives from the PCM.
The fuel pump control module 2 determines if the signal from the PCM on the FPC circuit is a valid duty cycle and frequency. If the duty cycle or frequency is invalid, the fuel pump control module 2 sends a 20% duty cycle signal on the FPM2 circuit to report the concern to the PCM. This DTC sets when the fuel pump control module 2 is still reporting that it is receiving an invalid duty cycle or frequency from the PCM after a calibrated amount of time.
Possible Causes: • FPC circuit open or short to ground
• FPC circuit short to voltage
• Radio frequency interference or electromagnetic interference
• Damaged fuel pump control module 2
• Damaged PCM
Diagnostic Aids: Check the harness for routing, alterations, incorrect shielding, or electrical interference from other systems.
Application Key On Engine Off Key On Engine Running Continuous Memory
All GO to Pinpoint Test KC.
P028D - Charge Air Cooler Cooling Fan Control Circuit Low
Description: This DTC sets when the PCM detects an open circuit or a short to ground in the CACCF circuit.
Possible Causes: • Damaged charge air cooler (CAC) fan relay
• CACCF circuit short to ground
• CACCF circuit open
• Damaged harness connector
• Damaged harness
Diagnostic Aids: Check the harness for intermittent concerns, incorrect connections, routing, alterations and damage due to
contact with other components.
Application Key On Engine Off Key On Engine Running Continuous Memory
All GO to Pinpoint Test KF.
P028E - Charge Air Cooler Cooling Fan Control Circuit High
Description: This DTC sets when the PCM detects a short to voltage in the CACCF circuit.
Possible Causes: • Damaged charge air cooler (CAC) fan relay
• CACCF circuit short to voltage
• Damaged harness connector
• Damaged harness
Diagnostic Aids: Check the harness for intermittent concerns, incorrect connections, routing, alterations and damage due to
contact with other components.
Application Key On Engine Off Key On Engine Running Continuous Memory
All GO to Pinpoint Test KF.
P0297 - Vehicle Over Speed Condition
Description: This DTC sets when the vehicle has been operated in a manner which caused the vehicle speed to exceed a
calibration limit. The vehicle speed is continuously monitored and evaluated by the PCM. For additional information on the vehicle speed limiter, refer to Section 1, Powertrain Control Software.
Possible Causes: • Vehicle driven at a high rate of speed
Diagnostic Aids: If there are no other symptoms, return the vehicle to the customer with information about the DTC.
If a symptom is present, refer to Section 3, No Diagnostic Trouble Codes (DTCs) Present Symptom Chart Index.
Application Key On Engine Off Key On Engine Running Continuous Memory
All Refer to the Description, Possible Causes and Diagnostic Aids for the DTC.
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.