Throttle Position Sensor 1 Circuit
2004-2007 Buick Rainier 4.2L I6
Description
The PCM detected a malfunction in the Throttle Position Sensor 1 circuit. This code is set when the TP sensor signal is erratic or out of expected range during operation.
Symptoms
- Check Engine Light
- Erratic or no throttle response
- Reduced Engine Power mode
- Stalling
- Rough idle
Common Causes
- Faulty throttle position sensor
- Corroded TP sensor connector
- Damaged wiring to TP sensor
- Throttle body failure
- PCM failure (rare)
Diagnostic Steps
- Test TP sensor voltage at idle and WOT
- Inspect TP sensor connector for corrosion
- Check wiring continuity
- Monitor TP sensor with scan tool through range
- Test 5-volt reference supply
Repair Notes
Replace throttle position sensor or throttle body assembly. Clean connectors.
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
P1120 on Other Vehicles
Common Questions
What does code P1120 mean on a 2004-2007 Buick Rainier?
P1120 stands for "Throttle Position Sensor 1 Circuit". The PCM detected a malfunction in the Throttle Position Sensor 1 circuit. This code is set when the TP sensor signal is erratic or out of expected range during operation.
What are the symptoms of P1120 on a Buick Rainier?
Common symptoms of P1120 include: Check Engine Light, Erratic or no throttle response, Reduced Engine Power mode, Stalling, Rough idle.
What causes P1120 on a 2004-2007 Buick Rainier?
Common causes of P1120 include: Faulty throttle position sensor, Corroded TP sensor connector, Damaged wiring to TP sensor, Throttle body failure, PCM failure (rare).