Fault Family System: Powertrain (P-Codes) 5 SAE Codes

EVAP Fuel Vapor Temp Sensor

Diagnostic & Technical Explanation

P2024 (EVAP Fuel Vapor Temperature Sensor Circuit) 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.

These 5 diagnostic trouble codes share one detection mechanism and one repair path, which is why MechanicDB groups them into a single authored fault family rather than repeating the same explanation 5 times.

Codes in this family (5)

Code	Definition	Repair coverage
P2024	EVAP Fuel Vapor Temperature Sensor Circuit	3 ranked fixes
P2025	EVAP Fuel Vapor Temperature Sensor Performance	3 ranked fixes
P2026	EVAP Fuel Vapor Temperature Sensor Circuit Low Voltage	3 ranked fixes
P2027	EVAP Fuel Vapor Temperature Sensor Circuit High Voltage	3 ranked fixes
P2028	EVAP Fuel Vapor Temperature Sensor Circuit Intermittent	3 ranked fixes

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)

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