P0121
Throttle/Pedal Position Sensor/Switch A Circuit Range/Performance
2004-2007 Buick Rainier 4.2L I6
High SeverityPowertrainGeneric (SAE)
Description
The TPS signal does not match expected values for the current operating conditions.
Symptoms
- Check Engine Light
- Erratic throttle response
- Stalling
- Hesitation
- Limp mode
Common Causes
- Worn TPS
- Carbon buildup on throttle body
- Sticking throttle plate
- Loose throttle cable
Diagnostic Steps
- Monitor TPS signal during throttle sweep
- Check for flat spots or dropouts
- Clean throttle body
- Inspect throttle cable/linkage
Repair Notes
Clean throttle body. Replace TPS if signal is erratic.
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
P0121 on Other Vehicles
Common Questions
What does code P0121 mean on a 2004-2007 Buick Rainier?
P0121 stands for "Throttle/Pedal Position Sensor/Switch A Circuit Range/Performance". The TPS signal does not match expected values for the current operating conditions.
What are the symptoms of P0121 on a Buick Rainier?
Common symptoms of P0121 include: Check Engine Light, Erratic throttle response, Stalling, Hesitation, Limp mode.
What causes P0121 on a 2004-2007 Buick Rainier?
Common causes of P0121 include: Worn TPS, Carbon buildup on throttle body, Sticking throttle plate, Loose throttle cable.