Evaporative Emission Control System Pressure Sensor High Input
The fuel tank pressure (FTP) sensor is reporting abnormally high pressure to the engine control module, indicating a malfunction in the evaporative emissions control system. This code typically sets when the sensor signal voltage exceeds the expected range, either from a faulty sensor, wiring issue, or excessive fuel tank pressure from a blocked purge valve or vent.
What You Might Notice
- Check Engine Light illumination
- Fuel odor inside or around the vehicle
- Possible difficulty refueling or fuel pump issues
- May notice no drivability symptoms initially
- Potential rough idle if EVAP system is severely restricted
Most Common Causes
- 1
Bad FTP sensor
The fuel tank pressure sensor has failed internally or is providing an incorrect signal voltage. This is the most common cause requiring sensor replacement.
- 2
Blocked EVAP purge hose or charcoal canister
A blockage in the EVAP system prevents proper vapor venting, causing abnormally high pressure in the fuel tank that the sensor detects.
- 3
Wiring or connector issues
An open circuit on the FTP sensor signal wire, loose connector, corroded pins, or loss of ground connection prevents proper sensor communication to the PCM.
- 4
Short to voltage on sensor signal wire
A short circuit on the FTP sensor signal wire causes it to read maximum voltage, triggering the high pressure fault code.
How to Diagnose It
- 1
Check Bad FTP sensor — The fuel tank pressure sensor has failed internally or is providing an incorrect signal voltage. This is the most common cause requiring sensor replacement.
- 2
Check Blocked EVAP purge hose or charcoal canister — A blockage in the EVAP system prevents proper vapor venting, causing abnormally high pressure in the fuel tank that the sensor detects.
- 3
Check Wiring or connector issues — An open circuit on the FTP sensor signal wire, loose connector, corroded pins, or loss of ground connection prevents proper sensor communication to the PCM.
- 4
Check Short to voltage on sensor signal wire — A short circuit on the FTP sensor signal wire causes it to read maximum voltage, triggering the high pressure fault code.
How to Fix It
- 1
Replace the FTP sensor
Remove the defective fuel tank pressure sensor and install a new OEM or quality aftermarket replacement. Ensure proper connector seating and verify the code clears after replacement.
- 2
Inspect and clean EVAP system components
Check the EVAP purge valve, hoses, and charcoal canister for blockages or restrictions. Clear any debris and verify proper airflow through the system, replacing components as needed.
- 3
Repair or replace FTP sensor wiring and connectors
Inspect the FTP sensor signal wire and connector for damage, corrosion, or loose pins. Repair any open circuits, shorts, or connection issues and verify proper ground continuity.
- 4
Check fuel tank filler cap and vent integrity
Ensure the fuel tank cap seals properly and that the fuel tank vent line is not blocked or damaged. Replace the fuel cap if it no longer seals correctly.
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