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 4-99
Diagnostic Trouble Code (DTC) Charts and Descriptions
P1021 - Cylinder Head Temperature Sensor 2 Circuit Range/Performance (Continued) Application Key On Engine Off Key On Engine Running Continuous Memory
All GO to Pinpoint Test DL.
P1022 - Cylinder Head Temperature Sensor 2 Circuit Low
Description: This DTC sets when a CHT2 circuit concern is present.
Possible Causes: • CHT2 circuit short to ground
• Damaged CHT2 sensor
• Incorrect CHT2 harness connection
Diagnostic Aids:
Application Key On Engine Off Key On Engine Running Continuous Memory
All GO to Pinpoint Test DL.
P1023 - Cylinder Head Temperature Sensor 2 Circuit High
Description: This DTC sets when a CHT2 circuit concern is present.
Possible Causes: • CHT2 circuit open
• CHT circuit short to voltage
• Damaged CHT2 sensor
• Incorrect CHT2 harness connection
Diagnostic Aids:
Application Key On Engine Off Key On Engine Running Continuous Memory
All GO to Pinpoint Test DL.
P1024 - Cylinder Head Temperature Sensor 2 Circuit Intermittent/Erratic
Description: This DTC sets when a CHT2 circuit concern is intermittently present while the engine is running.
Possible Causes: • Damaged CHT2 harness or connector
• Damaged CHT2 sensor
• CHT2 circuit open
• CHT2 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.
P1025 - Cylinder Head Temperature Sensor 2 Out Of Self Test Range
Description: This DTC sets when the cylinder head temperature 2 (CHT2) sensor is out of self-test range. The engine is not
at a normal operating temperature.
Possible Causes: • Cold engine
• Engine overheating
• Low engine coolant level
Diagnostic Aids: Bring the engine to operating temperature and repeat the self-test. If the engine overheats, check the cooling
system. 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.
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.