Electronic Throttle Control in Power Limiting Mode
2000-2003 Ford Excursion 7.3L V8 Power Stroke Diesel
Description
The Electronic Throttle Control (ETC) system has entered power limiting (limp) mode. The PCM has restricted throttle opening due to a detected fault in the ETC system, limiting vehicle speed and acceleration for safety.
Symptoms
- Severely reduced engine power
- Throttle response very limited
- Vehicle may only idle or drive slowly
- Check Engine Light
- Possible ETC warning light
Common Causes
- ETC system fault detected
- Throttle body malfunction
- Accelerator pedal position sensor fault
- Wiring issue in ETC circuit
- PCM detected conflicting throttle signals
Diagnostic Steps
- Check for other ETC-related DTCs first
- Inspect accelerator pedal position sensor
- Check throttle body operation
- Inspect all ETC wiring for damage
- Key off/on cycle may temporarily restore normal operation
Repair Notes
Diagnose and repair the root ETC fault. May require throttle body or pedal sensor replacement.
Related Codes
Other Powertrain Codes
- P0001Fuel Volume Regulator Control Circuit/Open
- P0002Fuel Volume Regulator Control Circuit Range/Performance
- P0003Fuel Volume Regulator Control Circuit Low
- P0004Fuel Volume Regulator Control Circuit High
- P0010Intake Camshaft Position Actuator Circuit/Open Bank 1
- P0011Intake Camshaft Position Timing Over-Advanced Bank 1
- P0012Intake Camshaft Position Timing Over-Retarded Bank 1
- P0013Exhaust Camshaft Position Actuator Circuit/Open Bank 1
- P0014Exhaust Camshaft Position Timing Over-Advanced Bank 1
- P0015Exhaust Camshaft Position Timing Over-Retarded Bank 1
P1579 on Other Vehicles
Common Questions
What does code P1579 mean on a 2000-2003 Ford Excursion?
P1579 stands for "Electronic Throttle Control in Power Limiting Mode". The Electronic Throttle Control (ETC) system has entered power limiting (limp) mode. The PCM has restricted throttle opening due to a detected fault in the ETC system, limiting vehicle speed and acceleration for safety.
What are the symptoms of P1579 on a Ford Excursion?
Common symptoms of P1579 include: Severely reduced engine power, Throttle response very limited, Vehicle may only idle or drive slowly, Check Engine Light, Possible ETC warning light.
What causes P1579 on a 2000-2003 Ford Excursion?
Common causes of P1579 include: ETC system fault detected, Throttle body malfunction, Accelerator pedal position sensor fault, Wiring issue in ETC circuit, PCM detected conflicting throttle signals.