P0123 on Ford
Throttle/Pedal Position Sensor/Switch 'A' Circuit High Input
P0123 on Ford vehicles indicates throttle/pedal position sensor/switch 'a' circuit high input. Au7o has documented this code across 1 Ford model — most commonly on Ranger. This generic code means the PCM detected a higher-than-expected voltage from the throttle position sensor (or accelerator pedal position sensor) 'A' circuit. The computer uses this signal to know throttle/pedal opening for fuel, timing, and electronic throttle control, so an abnormally high reading disrupts those calculations. Symptoms can include erratic idle, hesitation, surging, poor or sudden acceleration, and limp-home mode, making prompt diagnosis important. Typical repair costs on Ford range from $100 to $450, depending on the specific model and root cause.
Common Causes of P0123
- •Faulty throttle position sensor
- •Short to voltage in the TPS signal circuit
- •Open sensor ground causing high reading
- •Damaged or corroded TPS connector
- •Worn throttle body / TPS contacts
- •Chafed wiring shorting to a power wire
- •Faulty PCM (rare)
P0123 on Ford by Model
Ford Ranger(1 issue)
- Throttle Position Sensor and Idle Air Control Related Stalling/Hanging Idle2000-2011
Many owners of 2000-2011 Rangers report intermittent high idle, unstable idle, or stalling when coming to a stop, often traced to a failing throttle position sensor, dirty or failing idle air control valve, or both. The problem is especially common on older cable-throttle trucks where carbon buildup and sensor wear accumulate with age. Symptoms can be inconsistent, which leads to repeated parts swapping before the root cause is isolated.
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View P0123 across all makes →Frequently Asked Questions
What does P0123 mean on Ford?▼
P0123 stands for "Throttle/Pedal Position Sensor/Switch 'A' Circuit High Input." This generic code means the PCM detected a higher-than-expected voltage from the throttle position sensor (or accelerator pedal position sensor) 'A' circuit. The computer uses this signal to know throttle/pedal opening for fuel, timing, and electronic throttle control, so an abnormally high reading disrupts those calculations. Symptoms can include erratic idle, hesitation, surging, poor or sudden acceleration, and limp-home mode, making prompt diagnosis important. On Ford specifically, this code is documented across 1 model.
What causes P0123 on Ford vehicles?▼
Common causes on Ford: Faulty throttle position sensor, Short to voltage in the TPS signal circuit, Open sensor ground causing high reading, Damaged or corroded TPS connector, Worn throttle body / TPS contacts. Specific causes vary by model and year — see the per-model sections below.
How much does it cost to fix P0123 on a Ford?▼
Repair costs on Ford range from $100 to $450, depending on the specific model and root cause.
Which Ford models have P0123 documented?▼
Au7o has documented P0123 on 1 Ford model: Ranger.