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P2401 is a diagnostic trouble code (DTC) for "EVAP Leak Detection Pump Control Circuit Low". 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. Once we are able to diagnose the problem, you will be provided with an upfront quote for the recommended fix and receive $20.00 off as a credit towards the repair. All our repairs are backed by our 12-month / 12,000-mile warranty.
P2401 is a OBD2 generic trouble code indicating a fault within the EVAP leak detection circuit. This code may be seen with other EVAP system codes.
The P2401 trouble code is telling us the EVAP control circuit has had a fault with the leak detection pump. The leak detection pump is used by the ECM to pressurize the EVAP system to check for leaks that are present.
When the ECM has detected the the circuit has low voltage it will trigger a P2401 code. The code will remain until the issue is resolved or normal voltage is detected over multiple vehicle trips.
The Check Engine Light will be triggered in all instances of the P2401 code.
Generally no other symptoms are noticed by the driver.
The P2401 code can be a complex code to diagnose. Following these simple steps technicians are able to diagnose this code:
Hook up a scan tool and check for any codes stored in the ECM
Note all codes and the freeze frame data for each
Clear all codes
Take the vehicle for a test drive, preferably under similar operation conditions as the freeze frame data
Perform a visual inspection of the EVAP system looking for any broken or cracked components and lines
Test the gas cap with a cap tester
Using a scan tool the EVAP systems self test will be performed
A smoke machine will be used to check for and EVAP leaks
Lastly, the ECM will be tested if nothing else gives a conclusive answer
The P2401 can be a tricky code to diagnose as there are many different components that can cause it.
Usually the gas cap is replaced and the code cleared. This may solve some cases of the P2401 but not all. In the cases where the code reappears, step by step diagnostic testing will be required to accurately diagnose this code.
The P2401 will not exhibit any concerns that prevent the vehicle from driving or running normally. It will however prevent the vehicle from passing emissions testing and may release fuel vapors into the atmosphere.
When the EVAP system has leaks they are usually vapor leaks. These leaks are usually to small to view unaided and may only be noticed either from the Check Engine Light or a fuel smell. When these occur a smoke machine is used to fill the EVAP system with a specific kind of smoke that will make the leaks appear so they can be repaired.
YourMechanic offers certified mobile mechanics who will come to your home or office to diagnose and repair your vehicle. Get a quote and book an appointment online or speak to a service advisor at 1-800-701-6220.