What it means
A general fault is reported on the EVAP fuel-vapor temperature sensor circuit — open, shorted, or out of plausible range. The sensor is part of the evaporative-emission system used to monitor canister loading.
At a glance
- Usually lights the check-engine light
- Affects emissions; the car can fail an emissions test
How it works
The EVAP fuel-vapor temperature sensor measures vapor temperature in the evaporative-emissions system, helping the control module assess fuel-vapor and canister conditions. P2024 sets when the sensor circuit has a general fault, such as an open, short, or reading outside the expected range.
Common causes
Most likely first.
- Vapor temperature sensor failed
- Harness fault between sensor and PCM
Symptoms
- Check engine light on
- Possible smell of fuel near tank or engine bay
- Failed emissions inspection
- Loose-cap warning may appear
How to diagnose it
- Check freeze-frame data and the EVAP vapor-temperature reading to see whether it is missing or implausible under the recorded conditions.
- Inspect the fuel cap and EVAP system area for a loose cap, fuel odor, damaged connectors, or visible harness damage.
- Locate the vapor-temperature sensor using vehicle service information and inspect its connector and wiring for corrosion, moisture, or breaks.
- Check sensor reference, ground, and signal circuits for opens or shorts using the manufacturer's wiring diagram and specifications.
- If the wiring checks out, test the sensor response against the manufacturer's procedure and replace it only if it fails.
Common fixes
- Tighten or correctly refit a loose fuel cap and clear the code after checking for recurrence.
- Clean and secure a contaminated or loose sensor connector.
- Repair an open, shorted, or damaged harness section.
- Replace the EVAP fuel-vapor temperature sensor if circuit checks pass and the sensor fails testing.
Can I keep driving?
The vehicle will often remain drivable, but the fault can prevent proper EVAP monitoring and cause an emissions-test failure. If you smell fuel, avoid flames and have the source checked promptly.
A code shows where the control module detected a fault, not always which part failed. Check the causes in order and confirm with a test before replacing parts. Have several codes? Check them together
This is a generic code: it means the same on every make. The car’s maker may add more detail in its own service information.