Easy one-page printout for the garage or repair shop
This summary uses the existing diagnostic information shown in full below.
This code means that the car's computer thinks the pressure in the fuel tank is too high. It's like when a balloon is filled with too much air.
The P11E8 code is triggered when the vehicle's engine control module (ECM) detects that the fuel tank pressure/temperature sensor is reading a pressure that is higher than expected.
The P11E8 code indicates an issue with the fuel tank pressure/temperature sensor. This sensor monitors the pressure and temperature inside the fuel tank to ensure they are within the expected range. If the sensor detects a pressure that is too high, it sends this information to the ECM, which then triggers the P11E8 code. High pressure in the fuel tank can be due to a malfunctioning sensor, a blocked vent line, or excessive fuel vapor pressure.
• Check Engine Light is on
• Difficulty refueling
• Fuel odor around the vehicle
• Faulty fuel tank pressure/temperature sensor
• Blocked or kinked EVAP vent line
• Excessive fuel vapor pressure due to high temperatures
ECM: Engine Control Module, the computer that manages engine functions.
EVAP: Evaporative Emission Control System, which prevents fuel vapors from escaping into the atmosphere.
• Scan the vehicle for codes and freeze frame data.
• Inspect the fuel tank pressure/temperature sensor and its wiring.
• Check the EVAP system for blockages or leaks.
• Replace the faulty fuel tank pressure/temperature sensor.
• Clear any blockages in the EVAP vent line.
• Repair or replace any damaged wiring or connectors.
• OBD-II scanner
• Multimeter
• Vacuum pump
$150 - $400
Moderate
• Chevrolet Silverado
• Ford F-150
• Toyota Camry
• Regularly inspect and maintain the EVAP system.
• Ensure proper refueling practices.
• Keep the fuel cap tightly closed.
Sensor Issue
• Avoid overfilling the fuel tank.
• Have the vehicle inspected by a professional if the Check Engine Light is on.
Check with your vehicle manufacturer for warranty coverage on emissions-related components.
The P11E8 code has been associated with issues in vehicles with advanced EVAP systems that monitor fuel tank pressure and temperature.
Moderate – It should be addressed soon to prevent potential fuel system issues.
Driving with a malfunctioning EVAP system can lead to increased emissions and may not pass emissions testing.
• Vehicle at operating temperature
• Fuel tank between 1/4 and 3/4 full
The fuel tank pressure/temperature sensor is typically located on or near the fuel tank.
Q: Can I drive with the P11E8 code?
A: While the car may still be drivable, it's best to have it checked to avoid potential emissions issues.
Q: Will the P11E8 code affect my fuel economy?
A: It might, as it can lead to inefficient fuel vapor management.
High-End · Full-system diagnostics
A full-system bidirectional platform aimed at advanced DIY users and professional diagnostic workflows.
Network faults often require full-system access instead of a generic code reader alone.
View on Amazon
Universal · Digital multimeter
A solid entry-level multimeter for voltage, continuity, resistance, and basic electrical troubleshooting.
Helpful for checking voltage drops, grounds, and basic circuit health when modules are not communicating.
View on Amazon
Universal · Wire connectors and repair kit
Useful when diagnosis points toward damaged wiring, corroded terminals, or connector repairs.
Useful if diagnosis points toward damaged connectors, wiring, or terminal repairs.
View on AmazonThese are optional diagnostic tools, not guaranteed fixes. As an Amazon Associate I earn from qualifying purchases.
Fitment Required · Vehicle-fitment part
Relevant when EVAP diagnosis points toward purge-flow or purge-control faults.
EVAP diagnosis often includes purge-flow and valve-control faults.
Confirm the failed valve and exact fitment before buying parts.
View options on AmazonThese parts may be related to this fault category, but a code by itself does not confirm exact fitment or guarantee that replacing a part will solve the problem.