P2028 low

Evaporative Emission System Fuel Vapor Temperature Sensor Circuit Intermittent

The P2028 code means the vehicle's onboard diagnostic system has detected: Evaporative Emission System Fuel Vapor Temperature Sensor Circuit Intermittent. This is a low severity code.

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Keep driving?
Yes, but fix soon
DIY difficulty
moderate
Estimated cost
$100 - $300 (parts and labor)
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Common Symptoms

  • Check Engine Light on intermittently
  • No driveability issues
  • Emissions test may fail
  • CEL may come and go
  • EVAP monitor incomplete

Probable Causes (Ranked by Likelihood)

  • Loose or corroded sensor connector Very High
  • Intermittent wiring fault High
  • Failing fuel vapor temperature sensor Moderate
  • Vibration-related wiring break Moderate
  • PCM intermittent input fault Low

Step-by-Step Diagnostic Procedure

  1. Confirm P2028 and review freeze frame data

  2. Wiggle-test sensor connector and wiring while monitoring signal

  3. Inspect wiring harness for chafing or damage near mounting points

  4. Check connector pin tension and condition

Frequently Asked Questions

What does P2028 mean?

P2028 indicates an intermittent fault in the fuel vapor temperature sensor circuit, meaning the signal drops in and out, usually due to a loose connection or damaged wiring.

Can I drive with a P2028 code?

Yes, driving is safe. This intermittent emissions sensor fault does not affect engine performance.

How much does it cost to fix P2028?

Expect $100 to $300 for repairs, often just requiring connector cleaning or wiring repair.

Sources

This page is built from documented references. Verify against your own service info before repair work.

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