Common Checks
- Scan all stored throttle, pedal, and PCM codes before replacing parts.
- Inspect throttle body connector, pedal position sensor data, and wiring.
- Check for battery voltage or charging-system problems.
Diagnostic trouble code
P2104 Throttle Actuator Control System Forced Idle
The PCM has limited throttle control and forced idle as a protective response.
Throttle & Idle Control CodesCommon Repairs
- Repair the underlying throttle/pedal/wiring fault that caused forced idle.
- Clean or replace the throttle body only when actuator or sensor testing supports it.
- Correct low-voltage faults before condemning throttle parts.
Mustang Notes
- Treat this as a symptom code; companion electronic-throttle codes usually identify the cause.
Model-Year Applicability
Listed for 2005 and newer traditional gasoline Mustang pages in this first-pass catalog. Engine, calibration, and Ford-specific codes may narrow that range as more service data is added.