P2024: Evaporative Emission Fuel Vapour Temperature Sensor Circuit
What to do
The car will drive normally. The practical consequence arrives at an emissions test, where the evaporative self-test will not have completed and the vehicle is rejected rather than failed. Have it repaired well before a test is due, since the monitor needs a number of drive cycles to complete afterwards.
What this code means
A fault in the sensor measuring the temperature of fuel vapour in the evaporative emissions system. The reason a temperature reading matters to a leak test is worth setting out, because it explains a symptom that otherwise looks unrelated.
Evaporative leak detection works by sealing the fuel system and watching the pressure. But vapour pressure in a sealed tank changes with temperature all by itself — fuel warming after a journey raises it, fuel cooling overnight lowers it — so a pressure change on its own proves nothing. The module needs temperature to tell a genuine leak from ordinary thermal behaviour.
Without a trustworthy reading it will not run the test at all. That is the consequence people actually meet: the evaporative readiness monitor never completes, and the vehicle is rejected at an emissions test rather than failed — a distinction worth knowing, because a rejection cannot be fixed by clearing codes and driving round the block.
Likely causes
Start here
- Faulty fuel vapour temperature sensor · moderate
- Corroded or loose connector · easy
Less common
- Open circuit in sensor wiring · moderate
- Road damage to underfloor wiring · moderate
Symptoms
Components involved
Information, not instruction
CarGeek is a reference, not a service manual. Its pages are written from public sources and from what other people have found, never from a manufacturer's own service information, so they can be wrong or incomplete for your particular vehicle. Some of what they describe carries real risk: high voltage, fuel under pressure, stored energy, hot and moving parts.
Have anything you intend to act on checked by a trained person against the manufacturer's own procedure for your vehicle. Nothing here replaces that procedure.
Community experience
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What makes one worth reading:
- The car — make, model, year and engine. The same fault behaves differently on each.
- What you measured, not only what you replaced.
- What actually fixed it — or that nothing did, which is worth knowing too.
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