P0182

Universal

Fuel Temperature Sensor A Circuit low Input

Definition source: General OBD-II reference catalog
Definition verification: Not independently verified for display.
Time: Varies by diagnosis and vehicle | Diagnostic difficulty: Medium
Medium Severity

The engine computer monitors a signal from Fuel Temperature Sensor A to estimate fuel temperature. This code means the signal is lower than expected; it does not by itself prove the sensor has failed. Incorrect fuel-temperature data may affect engine management and can sometimes cause drivability issues, though there may be no noticeable symptoms.

Report an error with this code

⚠️ Before You Begin (Safety First)

The code alone usually does not require stopping immediately. Stop safely and seek assistance if the vehicle stalls, loses power in traffic, or shows other serious symptoms. If you smell or see leaking fuel, switch off the engine when safe and do not continue driving; have the vehicle inspected.

Common Symptoms

  • The check-engine light may be on because the engine computer has detected a low signal from Fuel Temperature Sensor A.
  • There may be no noticeable change in vehicle operation if the computer can compensate for the inaccurate reading.
  • Some vehicles may have hard starting, rough running, hesitation, or reduced performance if incorrect fuel-temperature data affects engine management.
  • Fuel economy or emissions may be affected if the engine computer uses the inaccurate reading when adjusting operation.

Common Causes

  • Fuel Temperature Sensor A may be internally faulty and produce a signal that is too low.
  • Wiring may be damaged or shorted to ground, pulling the sensor signal low.
  • The sensor connector may be loose, corroded, contaminated, or have damaged terminals.
  • A problem in the sensor circuit or related engine-computer connection may cause an incorrectly low reading.

Diagnostic Steps

  1. Check whether the check-engine light is steady or flashing and note any drivability problems; stop driving if the engine stalls, loses power severely, or fuel is leaking.
  2. Use a compatible scan tool to record the code and any related codes before clearing anything; related information can help identify whether the fault is isolated or part of a wider circuit issue.
  3. With the engine off, visually inspect accessible wiring and connectors for looseness, corrosion, contamination, chafing, or obvious damage; do not pull on wires or disconnect components while the system is powered.
  4. If a scan tool displays Fuel Temperature Sensor A data, compare the reading with other available temperature information when the vehicle has been sitting and temperatures should be similar; use vehicle-specific service information to interpret differences.
  5. If the code returns or the cause is not clear, have the circuit tested using the correct wiring diagram and procedures for the vehicle rather than replacing the sensor based only on the code.

When to Call a Professional

Confirm the code and check for related codes. Compare the sensor reading with other available temperature information when the vehicle is cold, then inspect the connector and wiring for damage, corrosion, poor contact, or a short. Use the vehicle-specific wiring diagram and service information for electrical tests and interpretation before replacing parts.

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Commonly Asked Questions

Does P0182 mean Fuel Temperature Sensor A must be replaced?

No. The code identifies a low input in the sensor circuit, not a confirmed failed part. Wiring, connector, or circuit problems can produce the same detected condition.

What does “low input” mean in this code?

It means the engine computer detected a sensor-circuit signal that was lower than expected. It does not mean the fuel temperature itself is necessarily low.

Can I drive with P0182?

If the vehicle runs normally and there is no fuel leak, the code alone may not require an immediate stop, but arrange diagnosis soon. Stop safely if the vehicle stalls, loses power severely, or develops another serious symptom.

How can a technician distinguish a sensor problem from a wiring problem?

A technician can compare scan data with other temperature information and inspect or test the sensor circuit using the vehicle-specific wiring diagram and service procedures.

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