Technical Description of OBD-II Trouble Code
The circuit of the Fuel Vapor Temperature Sensor in the Evaporative Emissions (EVAP) system has a high voltage.
What does that mean?
This is a generic diagnostic trouble code (DTC) that applies to OBD-II vehicles, including Mercedes Benz, VW, Audi, Subaru, Chevy, Dodge, BMW, Suzuki, Hyundai, Sprinter, etc. However, it is more commonly found on Mercedes-Benz vehicles.
The EVAP system was introduced to vehicles for various reasons, such as reducing emissions, improving fuel efficiency, and containing fuel vapors. It also recycles unused fuel. The system relies on sensors, switches, and valves to maintain desired emissions. The fuel vapor temperature sensor, in particular, monitors the temperature of unburned vapors.
It is important to note that the EVAP system uses plastic components, which can be susceptible to damage in harsh conditions, especially during winter.
The check engine light will activate with code P2027 and associated codes P2024, P2025, P2026, and P2028 when the ECM detects missing or out-of-range electrical values in the fuel vapor temperature sensor or related circuits. It is essential to prioritize the overall health of the EVAP system.
Code P2027 indicates that the actual sensor/circuit voltage is higher than desired or expected by the ECM.
What is the severity of this DTC?
On the severity scale, this EVAP fault is considered low. The primary impact is on the atmosphere, as the system is designed to reduce emissions. However, it is crucial to address the issue promptly to prevent further problems.
What are some of the symptoms of the code?
Symptoms of a P2027 trouble code may include:
What are some of the common causes of the code?
Possible causes for code P2027 include:
How do I troubleshoot and repair a P2027 code?
As mentioned earlier, it is important to ensure the overall health of the EVAP system. Check for obstructions and visible cracks in the plastic pipes. Locate where the system draws fresh atmospheric air for pressure regulation. In most cases, the system components are located underneath the vehicle. Use wheel ramps for convenience and safety when working on the system.
NOTE: Exercise caution when disconnecting/manipulating EVAP pipes and hoses, as they may break or require replacement/repair.
Test the sensor by performing a pin-out test to verify its functionality.
