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P2409 is a diagnostic trouble code (DTC) for "Fuel Cap Sensor/Switch Circuit Range/Performance". This can happen for multiple reasons and a mechanic needs to diagnose the specific cause for this code to be triggered in your situation. Our certified mobile mechanics can come to your home or office to perform the Check Engine Light diagnostic for $114.99 . Once we are able to diagnose the problem, you will be provided with an upfront quote for the recommended fix and receive $20.0 off as a credit towards the repair. All our repairs are backed by our 12-month / 12,000-mile warranty.
Fuel Cap Sensor/Switch Circuit Range/Performance
P2409 is an OBD-II generic code for the Engine Control module (ECM) detecting the fuel cap sensor, switch or circuit is out of range or performance within the specifications.
The ECM monitors the fuel cap to see if it is open or closed. The code is set when the fuel cap is left open or the circuit has failed open.
The Evaporative Emission Control System (EVAP) cannot operate correctly if the fuel cap is left open.
The fuel cap sensor is out of the specified range for a closed or open cap.
The Check Engine Light will be illuminated and the code is set in the ECM memory as a fault.
The vehicle will not run any different in most cases.
The vehicle may have a fuel odor in the vehicle or around the fuel cap.
The vehicle may have a Check Gas Cap Light on in the dash.
The vehicle will fail emission testing.
Try to scan for codes and document the codes in the ECM memory and look at the freeze frame data for the problem before clearing the codes and retesting.
Check the fuel cap to see if it is loose or missing.
Test the resistance of the cap switch or sensor and check toward its specification.
Test wiring for open circuits between the ECM and the cap sensor.
Clearing ECM memory codes before checking the freeze frame data for the main failure problem, so the failure may be duplicated and repaired.
Failing to clear the ECM codes after the codes are fixed.
Failing to verify the failure before replacing parts.
Failing to check with the vehicle operator to see if the cap was recently left off or loose.
Code P2409 is an indication that the gas cap is not closed or not activating the cap closed switch or sensor. The cap being left off can cause fumes to build up around the vehicle. Dirt and water may be able to get in the tank and contaminate the fuel in the tank if the cap is off.
Code P2409 is for the gas cap closed sensor or switch. The most common cause for this code is when the operator is not closing the cap tight enough every time and the sensor detects this as a performance problem with the sensor, thus turning on the light and setting the code.
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