Faulty fuel vapor temperature sensor; Damaged or corroded wiring or connector at the sensor; Open or short circuit in the sensor signal circuit; Failed PCM (rare, but possible after other causes are ruled out); EVAP system contamination or blockage affecting sensor readings; Extreme ambient temperature conditions causing out-of-range readings (false positive)

DTC codes / P20xx · Fuel and air metering and auxiliary emission controls / P2025

P2025Evaporative Emissions (EVAP) Fuel Vapor Temperature Sensor Performance

P2025 indicates that the powertrain control module (PCM) has detected an implausible signal or performance issue from the evaporative emissions (EVAP) fuel vapor temperature sensor. This sensor monitors the temperature of fuel vapors in the EVAP system, and the PCM expects its readings to change in a predictable way during certain conditions, such as after a cold start or during a leak test. When the sensor's output does not match the expected profile, the PCM stores this code and illuminates the check engine light.

SystemPowertrain

Code typeGeneric (all makes)

SeverityLow

Fix difficultyIntermediate

AreaFuel and air metering and auxiliary emission controls

Symptoms you may notice

Check engine light illuminated, often with no other noticeable symptoms
A slight fuel odor may be present if the sensor failure affects EVAP system operation
In rare cases, the vehicle may fail an emissions inspection due to the stored code
No drivability issues are typically observed because the sensor is not used for engine management
The remote start feature may be disabled on some vehicles as a precaution

Common causes, most likely first

Faulty fuel vapor temperature sensor
Damaged or corroded wiring or connector at the sensor
Open or short circuit in the sensor signal circuit
Failed PCM (rare, but possible after other causes are ruled out)
EVAP system contamination or blockage affecting sensor readings
Extreme ambient temperature conditions causing out-of-range readings (false positive)

How to diagnose and fix it

Use an OBD-II scanner to verify the code and check for related EVAP codes
Inspect the sensor and its connector for physical damage, corrosion, or loose pins
Measure the sensor's resistance and compare it to the manufacturer's specification
Check the wiring harness for continuity and shorts between the sensor and PCM
Test the sensor's signal voltage with a multimeter while monitoring live data
Replace the fuel vapor temperature sensor if it fails electrical tests
Clear the code and perform a drive cycle to confirm the repair

What the fuel vapor sensor really does

The fuel vapor temperature sensor is often confused with the fuel tank pressure sensor, but they serve different roles in the EVAP system and set different codes.
A P2025 can be set by a weak battery or poor ground connection, causing voltage irregularities that mimic a sensor failure.
Some vehicles use the fuel vapor temperature sensor to enable or disable EVAP leak tests, so a failure can prevent other EVAP monitors from running.
Replacing the sensor without checking the wiring is a common misdiagnosis, as harness damage is a frequent root cause.
The sensor's readings are compared to intake air and ambient temperature; extreme cold or heat can trigger a false code if the PCM's logic is sensitive.

Can I keep driving with P2025?

The vehicle is safe to drive under normal conditions because this fault does not affect engine performance or safety systems. However, avoid ignoring the check engine light, as it may prevent the EVAP system from self-testing and could lead to a failed emissions test.

Tools that help

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Guidance is general and written for all OBD-II vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.