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 4-77
Diagnostic Trouble Code (DTC) Charts and Descriptions
P051B - Crankcase Pressure Sensor Circuit Range/Performance
Description: This DTC sets when the crankcase pressure sensor is greater than or less than an expected value for the
current operating conditions.
Possible Causes: • Crankcase pressure sensor is not within a calibrated range during key ON, engine OFF
• Crankcase pressure sensor voltage indicates high pressure
• Crankcase pressure sensor voltage indicates high vacuum at low airflow
• Leak in the positive crankcase ventilation (PCV) system
• Damaged crankcase pressure sensor
Diagnostic Aids:
Application Key On Engine Off Key On Engine Running Continuous Memory
All GO to Pinpoint Test HG.
P051C - Crankcase Pressure Sensor Circuit Low
Description: This DTC sets when the crankcase pressure sensor voltage is less than 1 V.
Possible Causes: • CKCP circuit short to ground
• Damaged crankcase pressure sensor
Diagnostic Aids:
Application Key On Engine Off Key On Engine Running Continuous Memory
All GO to Pinpoint Test HG.
P051D - Crankcase Pressure Sensor Circuit High
Description: This DTC sets when the crankcase pressure sensor voltage is greater than 4.9 V.
Possible Causes: • CKCP circuit open
• CKCP circuit short to voltage
• Damaged crankcase pressure sensor
Diagnostic Aids:
Application Key On Engine Off Key On Engine Running Continuous Memory
All GO to Pinpoint Test HG.
P0528 - Fan Speed Sensor Circuit No Signal
Description: The PCM uses the fan speed sensor (FSS) input to monitor the cooling fan clutch speed. This DTC sets if the
indicated fan speed is lower than the calibrated value during the key ON engine running (KOER) self-test.
Possible Causes: • FSS VPWR circuit open
• FSS PWRGND circuit open
• FSS circuit open
• FSS circuit short
• Damaged FSS
• Damaged PCM
Diagnostic Aids: Visually inspect the cooling fan clutch for damage or restriction.
Application Key On Engine Off Key On Engine Running Continuous Memory
All GO to Pinpoint Test HV.
P052A - Cold Start Intake (A) Camshaft Position Timing Over-Advanced (Bank 1)
Description: This DTC sets when the variable camshaft timing (VCT) position is over-advanced during cold start up. This
DTC sets when the camshaft timing exceeds a maximum calibrated value or remains in an advanced position.
Possible Causes: • Camshaft timing incorrectly set
• Continuous oil flow to the VCT piston chamber
• Variable camshaft timing bank 1 solenoid 1 (VCT11) valve stuck open
• Camshaft advance mechanism binding (VCT unit)
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.