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P0183 means the vehicle computer detected a high electrical input in the fuel temperature sensor A circuit. The fault may come from wiring, a connector, the sensor, or a control module; the code alone does not prove the sensor has failed. Confirm the cause with the diagnostic procedure for your exact vehicle before replacing parts.
What does P0183 mean?
Ford describes P0183 as “Engine Fuel Temperature Sensor A Circuit High Input.” Mitsubishi uses “Fuel Tank Temperature Sensor Circuit High Input” for the applications covered by its service information. Both descriptions refer to a signal above the controller’s calibrated limit, but sensor names and circuit designs vary by vehicle. Ford’s OBD-II PCED says its monitor checks the fuel-temperature-sensor circuit for high voltage over a calibrated period; it does not establish one universal voltage threshold.
P0183 identifies a circuit condition, not the part responsible for it. An open or shorted wire, poor connection, failed sensor, or control-module fault can produce a high-input reading.
Possible causes of P0183
- An open or short in the sensor wiring, or a damaged harness.
- A disconnected, damaged, or poorly making connector.
- A faulty fuel-temperature sensor.
- A control-module fault, such as a damaged PCM or ECM.
- On some applications, low ambient-temperature operation or a faulty fuse.
These are possibilities identified in manufacturer and vehicle-specific references, not a diagnosis of any particular car. Ford lists wiring faults, low ambient-temperature operation, improper harness connection, a damaged sensor, and a damaged PCM. Mitsubishi lists sensor, wiring/connector, and ECM faults. Ross-Tech’s Volkswagen-group reference also includes a faulty fuse. Terminology and causes can differ by application.
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How to diagnose and fix P0183
Use the service information for the vehicle’s make, model, year, and engine. The steps below provide a safe diagnostic sequence, not a substitute for the manufacturer’s exact test procedure.
- Record the codes and freeze-frame data. Save the scan results before clearing codes so you retain the conditions present when the fault occurred.
- Identify the correct service procedure. Confirm the vehicle details and the manufacturer’s sensor name, circuit diagram, pinout, and test criteria. Sensor location and wiring are not universal.
- Check the sensor data with a compatible scan tool. Look for the fuel-temperature sensor PID or data-list item and compare it with the manufacturer’s diagnostic procedure and the conditions recorded. A basic code reader may not show manufacturer-specific data; verify the tool’s vehicle coverage and data functions.
- Inspect the wiring and connectors. Check for disconnection, damage, poor contact, or an open or short in the relevant circuit. Follow the vehicle-specific checks rather than assuming the sensor is the problem.
- Test the sensor and circuit. Use the correct wiring diagram, pinout, and specified values. Replace a sensor, repair wiring, or address a module only when the test results support that repair.
- Verify the repair. Clear the code and complete the prescribed verification procedure or drive cycle, then check whether P0183 returns.
For one Mitsubishi application, the 2021 service information sets a high-input criterion at more than 4.6 volts for two seconds under its stated check condition. That threshold applies only to that specified procedure; it is not a general P0183 test value. Mitsubishi’s diagnostic workflow and Saab’s 2005 9-2X procedure both use scan-tool data to aid diagnosis, while Ford recommends checking the fuel-temperature PID.
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Symptoms, severity, and whether you can drive
The code definition establishes a fuel-temperature-sensor circuit electrical fault, but it does not establish a universal symptom list, drivability effect, or severity rating. The sources do not show that every vehicle with P0183 will stall, run poorly, or remain safe to drive. Assess the car’s actual behavior and consult its matching service information or a qualified technician, particularly if it has other warning signs or drivability problems.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.What determines the repair?
The repair depends on what vehicle-specific testing finds. A loose or damaged connection may call for connector or harness repair; a sensor or module should be replaced only when testing identifies it as faulty. Exact sensor location, pinout, test values, repair labor, and parts cannot be determined from P0183 alone because they vary by vehicle. A professional electrical diagnosis or the correct service information can help when the required circuit tests are not available to you.
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