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P2025 — Evap Fuel Vapor Temperature Sensor Performance

Manufacturer-specificPowertrain (engine & transmission)

P2025 means the powertrain control module has detected an unexpected or out-of-range performance condition from the evaporative emissions fuel vapor temperature sensor. This sensor helps the PCM monitor fuel vapor temperature in the EVAP system so it can validate pressure sensor readings and detect system faults. The code sets when the reported temperature does not match expected values, remains stuck, or falls outside the normal operating range.

Symptoms

What causes it — most likely first

1. Failed EVAP fuel vapor temperature sensor

The sensor can develop an internal electrical fault or lose its ability to respond to temperature changes, sending an inaccurate or stuck signal to the PCM.

2. Wiring or connector problems

Open circuits, shorts to ground or power, corroded terminals, or pin damage in the harness between the sensor and PCM can produce an out-of-range or intermittent signal.

3. Sensor contamination or physical damage

Fuel residue, debris, moisture, or impact can alter the sensor's thermal response or damage its housing, causing irrational temperature readings.

4. Incorrect sensor installation or mounting

A sensor that is loose, missing its seal, or mounted in the wrong location may be exposed to ambient air or liquid fuel instead of fuel vapor.

5. PCM internal fault or calibration issue

This is uncommon; the PCM's internal rationality logic or software could misinterpret a good sensor signal, but it should only be suspected after the sensor and wiring are proven good.

How it's diagnosed

  1. Retrieve freeze-frame data and compare the reported vapor temperature to ambient temperature; look for stuck, erratic, or implausible values.
  2. Visually inspect the sensor connector and harness for corrosion, damaged terminals, pin push-outs, chafing, or moisture intrusion.
  3. Test the sensor's resistance or output voltage against manufacturer temperature specifications, checking response at more than one temperature if possible.
  4. Check circuit continuity, reference voltage, and ground between the sensor and PCM, and verify there are no shorts to power or ground.
  5. If the sensor and all wiring tests pass, verify PCM software/calibration and consider PCM replacement only as a last resort.

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 SensorP2024 — Evap Fuel Vapor Temperature Sensor CirP2026 — Evap Fuel Vapor Temperature Sensor Cir

Frequently asked

Do I need to replace the PCM for P2025?

Usually no. PCM failure is uncommon for this code; most cases are resolved by replacing the sensor or repairing the wiring/connector. Only consider the PCM after the sensor, connector, and wiring have been thoroughly tested and ruled out.

Can I keep driving with a P2025 code?

Generally yes. This code typically does not create drivability or safety concerns, but the check engine light will stay on and the vehicle may fail an emissions test.

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

They are related but not always the same component. The EVAP fuel vapor temperature sensor measures vapor temperature in the evaporative emission system, while a fuel tank temperature sensor may measure liquid fuel temperature; their locations and specifications differ by vehicle.

What are common mistakes when diagnosing P2025?

Replacing the PCM first, ignoring connector corrosion, or testing the sensor at only one temperature. Always verify the sensor's response across its temperature range and inspect the wiring before replacing any control modules.