Code Definition

P1123 — Pedal Position Sensor A circuit high input

System: Powertrain  |  Type: Manufacturer-Specific  |  Make: Ford

About P1123

P1123 is a manufacturer-specific powertrain diagnostic trouble code recorded for Ford vehicles. It belongs to the P-prefix family of codes, which covers engine, transmission, emissions, or fuel-system faults.

When P1123 is stored, the module has detected a signal or supply voltage higher than the expected operating range; and a sensor-related fault — the reported value from the named sensor is out of spec.

Scanning & clearing: A generic OBD-II scan tool will usually read and clear powertrain (P) codes. For live data, freeze-frame capture, and bi-directional tests you may need a more capable scan tool that supports the vehicle's ECM protocol.

P1123 is a manufacturer-specific code. The same code string on a different make may have a different meaning. Always confirm the code's definition against the vehicle's service information for the specific make and model under test.

Code Information

The PCM continuously monitors the Accelerator Pedal Position (APP) Sensor A voltage to determine the driver's throttle demand. Sensor A normally outputs roughly 0.5V with the pedal released, rising to about 4.5V at full travel. P1123 is logged when the PCM sees the APP Sensor A signal above its calibrated upper limit, generally over about 4.8V, for a set time. This points to an electrical fault such as a short to the reference or battery voltage, or an open in the sensor ground that lets the signal float high, rather than a genuine full pedal application, and it typically forces reduced power ...

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