Fuel Temperature Sensor A Circuit High Input
The P0183 code indicates that the Engine Control Module (ECM) has detected a voltage signal from the fuel temperature sensor (circuit A) that is higher than the expected range. This sensor is typically a thermistor that changes resistance with temperature; a high voltage reading suggests either an open circuit, a short to voltage, or a faulty sensor. The ECM uses this input for fuel delivery and timing adjustments, so an incorrect reading can affect engine performance and emissions.
01. Most Common Causes
- Faulty fuel temperature sensor
- Open or shorted wiring in the sensor circuit
- Corroded or damaged connector
- ECM issue (rare)
02. Symptoms You Will Notice
- Check Engine Light illuminated
- Poor fuel economy
- Rough idle or hesitation
- Hard starting, especially when hot
03. Step-by-Step Diagnosis
Step 1: Use a scan tool to verify the code and check freeze frame data.
Step 2: Visually inspect the fuel temperature sensor and its wiring for damage or corrosion.
Step 3: Measure sensor resistance and compare to specifications; replace if out of range.
Step 4: Check for voltage at the sensor connector; if high, repair short to voltage or open circuit.
04. Commonly Affected Makes
05. Frequently Asked Questions
Is it safe to drive with this code?▼
It is generally safe for short distances, but prolonged driving may cause poor performance and increased emissions. It's best to diagnose and repair promptly.
How much does it cost to fix?▼
The cost typically ranges from $50 to $150 for parts and labor, depending on the vehicle and shop rates.