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 4-87
Diagnostic Trouble Code (DTC) Charts and Descriptions
P062x - (Continued) Possible Causes:
Diagnostic Aids: Refer to the Workshop Manual Section 303-14, Electronic Engine Controls.
Application Key On Engine Off Key On Engine Running Continuous Memory
All Refer to the Description, Possible Causes and Diagnostic Aids for the DTC.
P0630 - VIN Not Programmed Or Incompatible - ECM/PCM
Description: This DTC sets when the PCM detects various VID data that is out of a specified acceptable range.
Possible Causes:
Diagnostic Aids: The PCM did not receive a valid vehicle identification number (VIN) during reprogramming. Refer to Section 2,
Flash Electrically Erasable Programmable Read Only Memory (EEPROM), Programming The VID Block For A Replacement PCM, to reprogram the PCM.
Application Key On Engine Off Key On Engine Running Continuous Memory
All Refer to the Description, Possible Causes and Diagnostic Aids for the DTC.
P0642 - Sensor Reference Voltage A Circuit Low
Description: This DTC sets when the VREF circuit is less than VREF minimum.
Possible Causes: • VREF circuit short to ground
• Damaged sensor
• Incorrect harness connection
Diagnostic Aids: This DTC sets due to an under voltage condition on the VREF circuit.
Application Key On Engine Off Key On Engine Running Continuous Memory
All GO to Pinpoint Test C.
P0643 - Sensor Reference Voltage A Circuit High
Description: This DTC sets when the VREF circuit is greater than VREF maximum.
Possible Causes: • VREF circuit short to voltage
• Damaged sensor
• Incorrect harness connection
Diagnostic Aids: This DTC sets due to an over voltage condition on the VREF circuit.
Application Key On Engine Off Key On Engine Running Continuous Memory
All GO to Pinpoint Test C.
P064A - Fuel Pump Control Module A
Description: This DTC sets when the fuel pump control module detects an internal concern.
Possible Causes: • Damaged fuel pump control module
Diagnostic Aids: Clear the PCM DTCs. Repeat the self-test. If the DTC is retrieved again, install a new fuel pump control module.
Refer to the Workshop Manual Section 303-04, Fuel Charging And Controls.
Application Key On Engine Off Key On Engine Running Continuous Memory
All Refer to the Description, Possible Causes and Diagnostic Aids for the DTC.
P064D - Internal Control Module O2 Sensor Processor Performance - Bank 1
Description: The PCM monitors the application specific integrated circuit that controls and monitors the universal heated
oxygen sensor bank 1, sensor 1 (HO2S11). This DTC sets when the PCM detects an internal circuit or communication concern.
Possible Causes: • Damaged universal HO2S11 wiring
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.