P0120 - Throttle/Pedal Position Sensor/Switch A Circuit Malfunction

Problem detected in TPS/APP circuit A.

Code Overview

Problem detected in TPS/APP circuit A.

Common Causes

• TPS/APP sensor failed
• Wiring/connectors issue
• Throttle body contamination (some systems)

Diagnostic Steps

1. Check TPS/APP readings sweep smoothly
2. Inspect harness near throttle body
3. Check for 5V reference/ground
4. Perform throttle relearn if applicable

Likely Repairs & Cost Guides

Use test results to confirm the fault before pricing the repair.

Related OBD Codes

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Next Steps

Move from the code to a diagnosis path, then into repair pricing once the fault is confirmed.