Evaporative Emission Control System Pressure Sensor Range/Performance
The EVAP system pressure sensor has detected a voltage or performance signal outside its normal operating range. This sensor monitors fuel tank vapor pressure to ensure the evaporative emissions control system is functioning properly and preventing fuel vapors from escaping into the atmosphere.
What You Might Notice
- Check Engine Light (MIL) illumination
- Slight decrease in fuel efficiency
- No other noticeable symptoms in most cases
- Possible difficulty refueling or fuel pump issues
- Intermittent fuel smell near the vehicle
Most Common Causes
- 1
Defective EVAP Pressure Sensor
The pressure sensor itself has failed or is sending out-of-range signals to the PCM. This is the most common cause of this code.
- 2
Loose or Missing Fuel Cap
A missing, damaged, or improperly sealed fuel cap allows vapor to escape and prevents proper system pressure readings.
- 3
Clogged Fuel Tank Pressure Relief Valve
The pressure relief valve in the fuel tank becomes blocked, preventing normal vapor flow and causing abnormal pressure readings.
- 4
Broken or Collapsed EVAP Hoses and Lines
Rubber hoses or metal tubing in the EVAP system may be cracked, kinked, or collapsed, disrupting vapor flow and pressure signals.
How to Diagnose It
- 1
Check Defective EVAP Pressure Sensor — The pressure sensor itself has failed or is sending out-of-range signals to the PCM. This is the most common cause of this code.
- 2
Check Loose or Missing Fuel Cap — A missing, damaged, or improperly sealed fuel cap allows vapor to escape and prevents proper system pressure readings.
- 3
Check Clogged Fuel Tank Pressure Relief Valve — The pressure relief valve in the fuel tank becomes blocked, preventing normal vapor flow and causing abnormal pressure readings.
- 4
Check Broken or Collapsed EVAP Hoses and Lines — Rubber hoses or metal tubing in the EVAP system may be cracked, kinked, or collapsed, disrupting vapor flow and pressure signals.
How to Fix It
- 1
Replace Fuel Cap
Check the fuel cap for damage or a poor seal. Replace with an OEM or quality aftermarket cap if damaged or missing. This is often the quickest fix.
- 2
Replace EVAP Pressure Sensor
If the fuel cap is good, the EVAP pressure sensor itself is likely faulty. Remove and replace with a new sensor rated for your vehicle's model year.
- 3
Inspect and Replace EVAP Hoses and Lines
Visually inspect all EVAP hoses and metal lines for cracks, kinks, or collapse. Replace any damaged sections to restore proper vapor flow.
- 4
Clean or Replace Fuel Tank Pressure Relief Valve
If the pressure relief valve in the fuel tank is clogged, it may need to be cleaned or replaced. This typically requires fuel tank access or removal.
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