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.
4-122 Powertrain DTC Charts and Descriptions
Diagnostic Trouble Code (DTC) Charts and Descriptions
P2098 - Post Catalyst Fuel Trim System Too Lean Bank 2 (Continued)
Diagnostic Aids: Inspect the connectors for signs of damage, water intrusion or corrosion.
Application Key On Engine Off Key On Engine Running Continuous Memory
All GO to Pinpoint Test DZ.
P2099 - Post Catalyst Fuel Trim System Too Rich Bank 2
Description: The PCM monitors the correction value from the heated oxygen sensor bank 2, sensor 2 (HO2S22) as part of
the fore-aft oxygen sensor control routine. This DTC sets when the correction value is greater than a calibrated limit.
Possible Causes: • Corrosion
• Incorrect connections
• Exhaust leaks
• Contaminated universal HO2S21
Diagnostic Aids: Inspect the connectors for signs of damage, water intrusion or corrosion.
Application Key On Engine Off Key On Engine Running Continuous Memory
All GO to Pinpoint Test DZ.
P2100 - Throttle Actuator Control (TAC) Motor Circuit/Open
Description: This DTC sets when a PCM fault flag is set indicating the motor circuit is open.
Possible Causes: • ETBTACM connector is unplugged
• TACM+ circuit open
• TACM+ circuit short to voltage
• TACM- circuit open
• TACM- circuit short to voltage
• TACM+ and TACM- circuits are short together
• TAC motor has an open winding
• Damaged TAC motor
Diagnostic Aids: A TAC motor circuit PID reading may indicate a concern, if available.
Application Key On Engine Off Key On Engine Running Continuous Memory
All GO to Pinpoint Test DV.
P2101 - Throttle Actuator Control (TAC) Motor Range/Performance
Description: This DTC sets when a PCM fault flag is set indicating the motor circuit is open.
Possible Causes: • TAC motor circuits are cross wired
• Intake air system restrictions
• Throttle plate restrictions
Diagnostic Aids: A TAC motor circuit PID reading may indicate a concern, if available.
Application Key On Engine Off Key On Engine Running Continuous Memory
All GO to Pinpoint Test DV.
P2107 - Throttle Actuator Control (TAC) Module Processor
Description: This DTC sets when the electronic throttle control (ETC) area of the PCM failed the self-test. The concern could
be the result of an incorrect throttle position command, or TAC motor wires shorted together.
Possible Causes: • TACM+ circuit short to ground
• TACM+ circuit short to voltage
• TACM- circuit short to ground
• TACM- circuit short to voltage
• Damaged electronic throttle body (ETB)
• Damaged PCM
Diagnostic Aids: This DTC may be accompanied by other DTCs. Diagnose other DTCs first. A TAC motor circuit PID reading
may indicate a concern, if available.
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.