What Does P2028 Mean?
The EVAP fuel vapor temperature sensor signal is intermittent or erratic. The PCM is detecting an unreliable or fluctuating signal that doesn't correlate with expected temperature changes.
Common Causes
35%
Loose or corroded sensor connector causing intermittent contact
30%
Damaged wiring harness with intermittent short or open
20%
Failing fuel vapor temperature sensor with internal intermittent fault
10%
Vibration-induced connector or wiring issue
5%
PCM connector or internal circuit board issue
Diagnostic Steps
1
Step 1: Thoroughly inspect sensor connector and terminals for corrosion, bent pins, or loose fit
2
Step 2: Wiggle test wiring harness while monitoring sensor voltage on scan tool to reproduce intermittent condition
3
Step 3: Check for proper routing and secure mounting of wiring harness away from heat and moving components
4
Step 4: Monitor sensor data during test drive to identify conditions that trigger the fault
5
Step 5: Replace sensor connector or repair wiring if intermittent contact is found; replace sensor if internal fault suspected
Estimated Repair Cost
$100 - $400
Parts + labor, varies by vehicle and location
The EVAP fuel vapor temperature sensor signal is intermittent or erratic. The PCM is detecting an unreliable or fluctuating signal that doesn't correlate with expected temperature changes.
The most common cause of P2028 (Evaporative Emissions (EVAP) Fuel Vapor Temperature Sensor Circuit Intermittent) is: Loose or corroded sensor connector causing intermittent contact
Typical repair costs for P2028 range from $100 to $400, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Safe to drive with no immediate safety concerns. May cause emissions test failure and potentially affect EVAP system leak detection capability.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P2028 to identify the root cause.
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Quick Info
Category
Powertrain
System
Evaporative Emissions System
Difficulty
Type
Generic (SAE)
Recommended Tools
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