P0183 — Fuel temperature sensor circuit voltage too high

The engine control module is detecting an unusually high voltage from the fuel temperature sensor circuit, indicating a possible wiring issue, sensor failure, or poor connection. This sensor helps the engine adjust fuel delivery based on fuel temperature.

Common causes

The cause is almost always one of a few things. Here they are — P0183 rarely comes from anything outside this list:

• Faulty fuel temperature sensor
• Damaged or corroded wiring/connectors
• Open circuit in sensor wiring
• Poor electrical connection at sensor
• ECU malfunction (rare)

Where to start

In the order a sensible mechanic would work — the cheap checks first, the expensive replacements only after:

1. Inspect and clean sensor connectors
2. Check wiring harness for damage or corrosion
3. Test sensor resistance and replace if faulty
4. Repair or replace damaged wiring
5. Replace fuel temperature sensor if needed

That is what holds for P0183 in general. From here it depends on your engine — tell me which car it is and what it does, and I will give you the steps for it: real procedures, torque figures and diagrams instead of general advice.