What Does P2027 Mean?
The EVAP fuel vapor temperature sensor is reading an abnormally high voltage signal. This indicates the sensor circuit is reading temperatures above the expected range or has an open circuit condition.
Common Causes
35%
Open circuit or failed fuel vapor temperature sensor
30%
Open or damaged wiring harness or connector
20%
Corroded sensor connector causing high resistance
10%
Poor ground connection in sensor circuit
5%
PCM internal fault affecting sensor circuit
Diagnostic Steps
1
Step 1: Inspect fuel vapor temperature sensor connector for loose connections, corrosion, or damage
2
Step 2: Disconnect sensor and measure resistance; an infinite reading indicates open sensor
3
Step 3: Check for reference voltage at sensor connector; should read approximately 5 volts
4
Step 4: Verify continuity in signal and ground wires between sensor connector and PCM
5
Step 5: Monitor live sensor voltage with scan tool; should change when sensor is heated or cooled
Estimated Repair Cost
$100 - $350
Parts + labor, varies by vehicle and location
The EVAP fuel vapor temperature sensor is reading an abnormally high voltage signal. This indicates the sensor circuit is reading temperatures above the expected range or has an open circuit condition.
The most common cause of P2027 (Evaporative Emissions (EVAP) Fuel Vapor Temperature Sensor Circuit High Voltage) is: Open circuit or failed fuel vapor temperature sensor
Typical repair costs for P2027 range from $100 to $350, 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 trigger readiness monitor issues.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P2027 to identify the root cause.
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Quick Info
Category
Powertrain
System
Evaporative Emissions System
Difficulty
Type
Generic (SAE)
Recommended Tools
OBD2 Scanner
A quality scan tool helps you read codes, view live data, and clear faults.
