P1120
Throttle Position Sensor Out of Range Low
2000-2003 Ford Excursion 7.3L V8 Power Stroke Diesel 🇩🇪
Moderate SeverityPowertrain
Description
The Throttle Position sensor signal is below the minimum expected voltage. The PCM sees a voltage lower than the normal idle-position signal from the TP sensor.
Symptoms
- Check Engine Light
- Poor acceleration
- Idle surge
- Engine stalling
- Limp mode
Common Causes
- Faulty TP sensor
- Wiring short to ground
- Loose connector
- TP sensor misadjusted
- Corroded connector
Diagnostic Steps
- Check TP sensor voltage at idle (should be ~0.5-1.0V)
- Inspect wiring for shorts to ground
- Check connector for corrosion or looseness
- Test TP sensor through full range with multimeter
- Check 5V reference voltage
Repair Notes
Replace TP sensor if faulty. Repair wiring if shorted.
Related Codes
P0120Throttle/Pedal Position Sensor/Switch A CircuitP0122Throttle/Pedal Position Sensor/Switch A Circuit Low InputP1121TP Sensor Inconsistent with MAF SensorP1121Throttle Position Lower Than ExpectedP1121TP Sensor Inconsistent with MAF SensorP1121TP Sensor Circuit Intermittent High VoltageP1121TP Sensor Circuit Intermittent High VoltageP1121Accelerator Pedal Position Sensor Range/PerformanceP1121TPS Signal Not Consistent with MAF SignalP1121Accelerator Pedal Position Sensor Range/PerformanceP1121Accelerator Pedal Position Sensor Range/PerformanceP1121Throttle Position Lower Than ExpectedP1121TP Sensor Inconsistent with MAF SensorP1121TP Sensor Circuit Intermittent High VoltageP1121TP Sensor Circuit Intermittent High VoltageP1121TP Sensor Circuit Intermittent High VoltageP1121TP Sensor Circuit Intermittent High VoltageP1121TP Sensor Circuit Intermittent High VoltageP1121TP Sensor Circuit Intermittent High VoltageP1124TP Sensor Out of Self-Test RangeP1124TP Sensor Out of Self-Test RangeP1124TP Sensor Out of Self-Test RangeP1124Long Term Fuel Trim Mixture Too LeanP1124Long Term Fuel Trim Mixture Too LeanP1124Long Term Fuel Trim Mixture Too LeanP1124Throttle Unit Faulty Signal
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
P1120 on Other Vehicles
Common Questions
What does code P1120 mean on a 2000-2003 Ford Excursion?
P1120 stands for "Throttle Position Sensor Out of Range Low". The Throttle Position sensor signal is below the minimum expected voltage. The PCM sees a voltage lower than the normal idle-position signal from the TP sensor.
What are the symptoms of P1120 on a Ford Excursion?
Common symptoms of P1120 include: Check Engine Light, Poor acceleration, Idle surge, Engine stalling, Limp mode.
What causes P1120 on a 2000-2003 Ford Excursion?
Common causes of P1120 include: Faulty TP sensor, Wiring short to ground, Loose connector, TP sensor misadjusted, Corroded connector.