P2028

EVAP Fuel Vapor Temperature Sensor Circuit Intermittent

Q: Is it safe to drive with P2028?

Yes. It is an emissions-monitoring sensor fault with no effect on drivability, though it should be repaired to pass emissions testing.

Q: Can I just clear P2028?

You can, but because the fault is intermittent it will return until the wiring or sensor problem is fixed.

Evaporative emissions (EVAP) Generic OBD-II Low

What it means

P2028 means the signal from the EVAP fuel vapor temperature sensor is intermittent or erratic. This sensor helps the EVAP system monitor fuel-vapor conditions for emissions control. It is an emissions-only fault — the engine runs normally — so the practical effect is the warning light and a possibly incomplete emissions readiness monitor.

Low

Can I keep driving? Safe to drive — this EVAP sensor fault does not affect how the engine runs; it mainly turns on the warning light and can block emissions readiness.

Real-world scan data

Seen in

scans in the past year

Found in

<0.1%

of scans

<0.1%

of scans that found faults

Figures reflect only diagnostic scans recorded through our own apps and tools. Cars are typically scanned because a symptom or warning light prompted it, so these counts describe our scan records — not the incidence of faults in any model, and not the quality, reliability, or safety of any vehicle. No comparison between manufacturers or models is implied. All trademarks belong to their respective owners; no affiliation or endorsement is implied.

Common symptoms

What you'll notice

Check-engine light on
EVAP monitor may not complete (fails an emissions readiness check)
Usually no noticeable change in how the vehicle drives

Common causes

Most likely first

Intermittent open, short, or loose connection in the vapor temperature sensor wiringLikely
Corroded or backed-out connector pin at the sensorCommon
Failed EVAP fuel vapor temperature sensorCommon
Poor ground or reference-voltage supply to the sensorLess often

How to diagnose & fix

Work through it in order

Read freeze-frame data and wiggle-test the vapor temperature sensor connector and harness while watching live data.
Inspect the connector for corrosion, spread pins, or moisture and repair as needed.
Check the sensor's reference voltage and ground for dropouts.
Replace the EVAP fuel vapor temperature sensor if the signal is intermittent. Clear and re-test.

FAQ

Quick answers

Is it safe to drive with P2028?+

Yes. It is an emissions-monitoring sensor fault with no effect on drivability, though it should be repaired to pass emissions testing.

Can I just clear P2028?+

You can, but because the fault is intermittent it will return until the wiring or sensor problem is fixed.

Read & clear P2028 yourself

Scan your car, confirm the code, and clear it once it's fixed — with OBD DashX on your phone.

▶ Get it on Google Play

✓ Verified name — SAE J2012 / ISO 15031-6Guidance reviewed by OBD DashX