EVAP Fuel Vapor Temperature Sensor Circuit
Diagnostic trouble code P2024 indicates a malfunction in the Evaporative Emission (EVAP) Fuel Vapor Temperature Sensor circuit. The Powertrain Control Module (PCM) sets this code when it detects a voltage signal from the fuel vapor temperature sensor that falls outside the expected operating range.
This code primarily affects the vehicle's emissions system and will not typically cause drivability issues. It is safe to drive, but should be diagnosed and repaired to ensure proper EVAP system operation and pass emissions testing.
Common symptoms
- Illuminated Check Engine Light
- Failure to pass an emissions test
- Slight decrease in fuel economy
- Possible faint fuel odor near the vehicle
- No noticeable drivability symptoms in most cases
Likely causes
- Faulty EVAP fuel vapor temperature sensor
- Damaged, corroded, or loose wiring in the sensor circuit
- Poor electrical connection at the sensor connector
- Open or short circuit in the sensor wiring harness
- Faulty Powertrain Control Module (PCM) (rare)
What to check before replacing parts
Scan for other EVAP codes and record freeze frame data.
Look for: Check if other EVAP codes are present, which might indicate a broader system issue or help pinpoint the circuit fault.
Visually inspect the EVAP fuel vapor temperature sensor and its wiring harness.
Look for: Look for frayed wires, melted insulation, corrosion, or a loose connector at the sensor, which is usually located on or near the fuel tank.
Disconnect the sensor and check the connector for corrosion or damage.
Look for: Inspect the pins for green corrosion, pushed-out pins, or moisture that could cause high resistance or a short.
Test the sensor's resistance using a digital multimeter.
Look for: Compare the measured resistance at the current ambient temperature to the manufacturer's specified resistance chart. An open circuit (infinite resistance) or out-of-spec reading indicates a faulty sensor.
Check the reference voltage and ground at the sensor connector.
Look for: With the key on, engine off, verify there is a 5-volt reference signal and a good ground. Missing voltage or ground indicates a wiring issue between the PCM and the sensor.
This page explains the generic P2024 definition and is general reference information, not a diagnosis for your specific vehicle. Actual causes, severity, and repairs vary by make, model, engine, and mileage — always confirm with a scan tool and a qualified technician before replacing parts.
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