P2028 OBD II Trouble Code Evaporative Emissions (EVAP) Fuel Vapor Temperature Sensor Circuit Intermittent

How to quickly diagnose, repair, and info on symptoms and causes of a P2028 code that indicates a detected intermittent problem in the evaporative emissions fuel vapor temperature sensor circuit.

Symptoms of P2028 OBD II Trouble Code

  • Failed state/provincial emission test
  • CEL (check engine light) on
  • Slight decrease in fuel efficiency
  • Fuel smell
  • Possible abnormal fuel filling symptoms (lengthy fill ups, cannot pull trigger on gas pump fully, etc.)

Common Causes of P2028 OBD II Trouble Code

  • Defective EVAP (Evaporative emissions) fuel vapor temperature sensor
  • Broken or damaged EVAP fuel vapor temperature sensor wiring harness
  • An electrical connection that is not consistent, e.g.: fuse not properly seated in designated slot, loose connector pin, broken tab on connector etc.
  • Wire shorting to power
  • Excessive resistance within the circuit
  • ECM (Engine Control Module) issue
  • Pin/connector problem. (corrosion, melting, broken lock tab etc..)

Severity of P2028 OBD II Trouble Code

As with most EVAP faults, I would say this is low on the severity scale. The entire system was mostly designed to decrease emissions to the atmosphere. Obviously it does a lot more in the meantime but all that being said, really the only thing negatively affected by this fault is the atmosphere. At the moment, I cannot think of any EVAP system problem that would be detrimental to the overall safety of the vehicle. This does NOT mean you can continue to drive the vehicle day in day out without addressing the issue. One problem always leads to another if left unsolved for too long.