P0123 - Throttle/Pedal Position Sensor/Switch A Circuit High Input

TPS/APP signal high.

Treat the code as the starting point: compare symptoms, likely causes, and repair paths before pricing parts or moving into an estimate.

Code Overview

TPS/APP signal high.

Common Causes

• Open circuit
• Short to voltage
• Sensor failure

Diagnostic Steps

1. Inspect connector and wiring
2. Verify sensor output and reference

Likely Repairs & Cost Guides

Use symptoms, scan data, and quick checks to confirm the likely repair path before pricing parts. The estimator helps compare repair paths before replacing anything unnecessarily.

Related OBD Codes

Browse nearby code-family pages when the same fault pattern overlaps across systems, such as misfire, lean fuel trim, EVAP sealing, cooling, or charging faults.

Next Steps

Move from code lookup to diagnosis, then estimate the likely repair only after symptoms, causes, and checks point to the same path.