System: Powertrain (P-Code)
SAE Standard (Generic)
Family: EVAP Fuel Vapor Temp Sensor
Code P2027: EVAP Fuel Vapor Temperature Sensor Circuit High Voltage
Diagnostic & Technical Explanation
P2027 (EVAP Fuel Vapor Temperature Sensor Circuit High Voltage) covers the EVAP system's dedicated fuel vapor temperature sensor, which some manufacturers use to correct the calculated vapor pressure or flow rate during the leak-check and purge monitors. The sensor is a simple thermistor mounted in the vapor canister or purge line, and the ECM distinguishes between a signal outside its calibrated range, an open or shorted circuit, and intermittent contact at the connector.
First-listed procedure
Rank #1
Inspect and clean fuel vapor temperature sensor connector
Easy DIY
This is the first procedure in the authored
consideration order, not a measured cause likelihood. Execute it only when its prerequisites
and diagnostic findings support it. Its cost and labor estimates (where known), the step-by-step procedure and the
remaining 2 procedure(s) are in the licensed dataset. Ordering context.
Full family: EVAP Fuel Vapor Temp Sensor
What this page does not show
This page publishes the fault mechanism and the code index. The licensed dataset adds, for
every one of the 15,886 codes, the full authored repair set (56,729 procedures in total)
with the fields deliberately withheld here:
- Procedures 2..n after the first-listed procedure
- Aftermarket parts cost ranges in USD (
est_parts_cost_min/max_usd)
- Professional labor-hour estimates (
est_labor_hours)
- Step-by-step diagnostic and repair instructions
- Replacement-part mappings and catalog lookups
- 6,637 manufacturer-specific OEM codes across 32 makes ($149 tier)