Engine Error
P0120
Throttle/Pedal Position Sensor/Switch A Circuit Malfunction
Severity
High
Symptoms
Engine stalling, hesitation, transmission hard shifting
Common Causes
- Defective Throttle Position Sensor (TPS)
- Dirty throttle body holding plate open
- Damaged TPS wiring harness
- Corroded electrical connection
How to Fix
- 1 Replace TPS sensor
- 2 Clean the throttle body bore and plate
- 3 Repair damaged wiring
- 4 Clean connector contacts
Estimated Repair Cost
USD
$50
–
$300
Throttle cleaning: $50 - $100; TPS replacement: $100 - $250