P0182 OBD2 Code Guide
P0182 is a powertrain diagnostic trouble code. Use this hub to understand the plain meaning, the first checks to run, and which vehicle-specific guides may be more useful before replacing parts.
Fuel Temperature Sensor 1 Circuit Low Input
Code P0182 indicates that the Powertrain Control Module (PCM) has detected an abnormally low voltage signal from Fuel Temperature Sensor 1. This sensor is crucial for monitoring the temperature of the fuel, providing data to the PCM to accurately calculate fuel density. Based on this information, the PCM adjusts fuel injection timing and pulse width to optimize combustion efficiency, minimize emissions, and ensure proper engine performance across varying fuel temperatures. A "low input" typically suggests a short to ground in the sensor circuit, a faulty sensor internally shorted, or the PCM interpreting an implausibly high fuel temperature (which would result in a low resistance and thus low voltage signal in a typical thermistor circuit). Symptoms may include a lit Check Engine Light, reduced fuel economy, poor engine performance, rough idle, or difficulty starting.
Code verification standard
P0182 is published with SAE J2012 / ISO 15031-6 code structure plus OBD2 P0182 diagnostic context.
First checks
- - Read all stored and pending codes before clearing anything.
- - Save freeze-frame data so you know speed, load and temperature when the code set.
- - Inspect wiring, connectors, fuses, hoses and obvious leaks tied to the named system.
- - Compare live data against realistic values before buying sensors or modules.
- - Clear the code only after repair and complete a drive cycle to confirm it does not return.
P0182 diagnostic path
- 1Visual Inspection of Wiring and Connector: Begin by visually inspecting the fuel temperature sensor 1 and its associated wiring harness. Look for any signs of damage, fraying, corrosion, or exposed wires that could indicate a short to ground. Check the sensor connector for bent pins, corrosion, or a loose connection. Ensure the harness is routed away from hot exhaust components or sharp edges.
- 2Test Fuel Temperature Sensor 1 Resistance: Disconnect the fuel temperature sensor 1 and use a multimeter to measure its internal resistance. Compare the measured resistance value to the manufacturer's specifications for the given ambient temperature. A typical NTC thermistor will show decreasing resistance as temperature increases. An extremely low or zero resistance reading could indicate an internal short within the sensor, while an open circuit (infinite resistance) would also be a fault.
- 3Verify Circuit Voltage and Continuity: With the sensor disconnected, turn the ignition to the ON position (engine off). Use a multimeter to check for the 5-volt reference voltage at the appropriate pin of the sensor connector coming from the PCM. Also, check for a good ground connection at the other pin. Then, turn off the ignition and check for continuity between the sensor signal wire at the connector and the corresponding pin at the PCM connector. Simultaneously, check for any shorts to ground or power in the signal wire by probing it against a known good ground and battery positive.
- 4Monitor Live Data with Scan Tool: If the sensor and wiring tests appear normal, connect an OBD2 scan tool and monitor the live data stream for Fuel Temperature Sensor 1. Observe the reported fuel temperature reading. If the reading is stuck at an extremely high value (e.g., 250°F / 120°C or higher) or shows erratic fluctuations inconsistent with actual fuel temperature, it further points to a sensor or circuit issue, even if basic resistance tests passed.
Verify before repair
- - Repair or replace any damaged, corroded, or shorted wiring and connectors leading to Fuel Temperature Sensor 1.
- - Replace the faulty Fuel Temperature Sensor 1 if it fails resistance tests or provides inaccurate readings.
- - Clean any corrosion from the sensor terminals and connector pins to ensure a solid electrical connection.
Vehicle-specific pages to check next
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