Fuel Temperature Sensor A Circuit Low
What does P0182 mean?
The P0182 code means the vehicle's onboard diagnostic system has detected: Fuel Temperature Sensor A Circuit Low. This is a low severity code.
Common Symptoms
- Check Engine Light on
- PCM reads fuel temperature as excessively high
- Slightly incorrect fuel delivery
- Minor performance decrease
- No major drivability issues
Probable Causes (Ranked by Likelihood)
- Short to ground in the fuel temperature sensor circuit Very High
- Failed fuel temperature sensor (internally shorted) High
- Corroded connector or water intrusion Moderate
- Damaged wiring contacting ground Moderate
- PCM input circuit fault Low
Step-by-Step Diagnostic Procedure
-
Read fuel temperature on a scan tool. A reading of 250+ degrees F with the engine cold indicates a low circuit condition (sensor circuit is shorted, pulling voltage low).
-
Disconnect the fuel temperature sensor. If the reading jumps to -40 degrees F (open circuit), the sensor was shorted internally.
-
With the sensor disconnected, check the signal wire for a short to ground (should measure infinite resistance to ground).
-
Inspect the connector and wiring for corrosion, water intrusion, or chafed insulation touching metal.
-
If wiring is good and the sensor is shorted, replace the sensor.
Frequently Asked Questions
Can I drive with code P0182?
Yes, you can drive normally. The PCM will default to a substitute fuel temperature value. Fuel delivery will be slightly less accurate but the engine will still run properly.
Why does low circuit mean high temperature?
Fuel temperature sensors are typically negative temperature coefficient (NTC) thermistors. As temperature rises, resistance drops, pulling the signal voltage lower. A short to ground mimics extremely low resistance, making the PCM think the fuel is extremely hot.
Is this code common on diesel engines?
Yes. Diesel engines use fuel temperature sensors more extensively than gasoline engines for precise fuel metering. The sensor's location near the fuel rail exposes it to heat and vibration that can cause failures over time.