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P2024 — Evap Fuel Vapor Temperature Sensor Circuit

Manufacturer-specificPowertrain (engine & transmission)

P2024 indicates that the powertrain control module has detected an abnormal signal from the evaporative emission system fuel vapor temperature sensor circuit. The sensor provides temperature data used to manage purge valve operation and fuel vapor handling.

Symptoms

What causes it — most likely first

1. Failed fuel vapor temperature sensor

The sensor itself may be out of specification, providing an incorrect voltage or resistance value.

2. Open or shorted wiring in the sensor circuit

Damaged insulation, broken conductors, or a short to ground/power can corrupt the signal.

3. Corroded or loose connector at the sensor

Moisture or contamination can increase resistance or cause intermittent contact.

4. Contaminated sensor element

Fuel vapor residue or debris can coat the sensing element, altering its output.

5. Faulty powertrain control module (rare)

Internal PCM circuitry that reads the sensor may be defective, but this is uncommon.

How it's diagnosed

  1. Retrieve the code and any freeze‑frame data with a scan tool.
  2. Visually inspect the sensor wiring harness and connector for damage, corrosion, or loose pins.
  3. Measure the sensor resistance (or voltage) at the connector and compare to manufacturer specifications.
  4. Check for proper reference voltage and ground at the sensor connector with the ignition on.
  5. Perform continuity and resistance tests on the wiring between the sensor and the PCM.
  6. If all circuit tests pass, evaluate PCM operation using a known‑good sensor or substitute module.

Code facts & related codes

SystemPowertrain (engine & transmission)
StandardizationManufacturer-specific (P1/B1/C1/U1)
Related codesP2020 — Intake Manifold Runner Position SensorP2021 — Intake Manifold Runner Position SensorP2022 — Intake Manifold Runner Position SensorP2023 — Intake Manifold Runner Position SensorP2025 — Evap Fuel Vapor Temperature Sensor PerP2026 — Evap Fuel Vapor Temperature Sensor Cir

Frequently asked

Do I need to replace the PCM for this code?

PCM replacement is rarely required; the majority of P2024 faults are caused by the sensor or its wiring.

Can a loose gas cap cause P2024?

A loose gas cap typically triggers a different evaporative system code (e.g., P0455) and is not a direct cause of P2024.

Will clearing the code fix the problem?

Clearing the code only turns off the malfunction indicator lamp; the underlying fault will cause the code to return.

Is the fuel vapor temperature sensor the same as the fuel tank pressure sensor?

No, they are separate components; the temperature sensor measures vapor temperature while the pressure sensor measures tank pressure.