P0183 indicates the engine computer is seeing a voltage from the fuel temperature sensor circuit that is higher than expected, typically suggesting an open circuit or poor connection. The sensor helps the computer adjust fuel delivery based on fuel temperature. A high-input code usually points to the sensor, wiring, or connector rather than the computer.
The sensor has failed open internally, producing an out-of-range high voltage signal to the PCM.
A broken wire or short to voltage between the sensor and PCM can cause the signal to stay high.
Poor terminal contact or corrosion at the fuel temperature sensor connector can interrupt the signal path.
Corrosion or poor contact at the engine computer connector can affect the sensor signal input.
Internal failure of the engine computer input circuit is possible but very rare for this code.
The definition is universal; the diagnostics are engine-specific. Open your vehicle for the codes documented for it:
In many cases the vehicle can be driven, but the code should be diagnosed promptly because fuel delivery adjustments may be affected.
It often does, but an open or shorted wire or corroded connector can produce the same reading, so wiring should be tested before replacing the sensor.
No. A high-input fuel temperature sensor code is almost never caused by the PCM. Replacing the computer without proving a wiring or sensor fault is usually incorrect.
It can contribute to incorrect fuel metering and starting or idle issues, though many vehicles show no obvious drivability symptoms beyond the Check Engine Light.