Throttle/Pedal Position Sensor/Switch A Circuit Range/Performance
2019-2019 Buick Enclave 3.6L V6
The 2019 Buick Enclave is equipped with a 3.6L V6 engine. Below you'll find detailed p0121 diagnostic code information including labor time estimates, cost ranges, and technician notes specific to this engine configuration.
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 2019-2019 Buick Enclave?
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 Enclave?
Common symptoms of P0121 include: Check Engine Light, Erratic throttle response, Stalling, Hesitation, Limp mode.
What causes P0121 on a 2019-2019 Buick Enclave?
Common causes of P0121 include: Worn TPS, Carbon buildup on throttle body, Sticking throttle plate, Loose throttle cable.
Last updated: March 2026