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 4-107
Diagnostic Trouble Code (DTC) Charts and Descriptions
P128A - Cylinder Head Temperature (CHT) Sensor Circuit Intermittent/Erratic (Continued)
Possible Causes: • Damaged harness or connector
• Damaged sensor
• CHT circuit open
• CHT circuit short to ground
Diagnostic Aids: Monitor the CHT PID on a scan tool. Look for sudden changes in the reading when the harness is wiggled or the
sensor is tapped.
Application Key On Engine Off Key On Engine Running Continuous Memory
All GO to Pinpoint Test DL.
P1290 - Cylinder Head Temperature (CHT) Sensor Circuit Low
Description: This DTC sets when a CHT circuit short to ground concern is present.
Possible Causes: • CHT circuit short to ground
• Damaged CHT sensor
• Damaged CHT wiring harness or connector
Diagnostic Aids: The DTC P0117 may also be reported when this DTC sets. Either of these DTCs illuminates the malfunction
indicator lamp (MIL).
Application Key On Engine Off Key On Engine Running Continuous Memory
All GO to Pinpoint Test DL.
P1299 - Cylinder Head Over Temperature Protection Active
Description:
Possible Causes:
Diagnostic Aids: Refer to the Workshop Manual Section 303-03, Engine Cooling to diagnose the engine overheats symptom.
Application Key On Engine Off Key On Engine Running Continuous Memory
All Refer to the Description, Possible Causes and Diagnostic Aids for the DTC.
P130D - Engine Knock/Combustion Performance - Forced Limited Power
Description: This DTC sets when the knock sensor (KS) voltage has exceeded a maximum value greater than a calibrated
number of times within a set time period.
Possible Causes: • Fuel quality
• Base engine concerns
• Cooling system concerns
• Damaged spark plug
• Incorrect or corroded connections on ignition system harness connectors
• Lean fuel injector
• Long term fuel trim at lean limits
• Positive crankcase ventilation (PCV) system is leaking or stuck open
• Oil and filter maintenance beyond recommended intervals
• Charge air cooler (CAC) restriction
• Damaged PCM
Diagnostic Aids: Engine performance may be limited to protect the engine if this DTC is set.
This DTC may be accompanied by other DTCs. Diagnose all other DTCs first. If no other DTCs are present, verify no base engine concerns are present before continuing with diagnosis. Refer to the Workshop Manual Section 303-00, Engine System. The following driving conditions may cause this DTC to set: heavy acceleration from a stop, towing, carrying a heavy load or driving up a grade during a boost condition.
Application Key On Engine Off Key On Engine Running Continuous Memory
All GO to Pinpoint Test DG.
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.