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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检查引擎灯diagnosticfor $114.99。一旦我们能够诊断出该问题，就会为您提供建议的修复程序的前期报价，并获得20.0美元的折扣作为维修的信用。我们所有的维修都得到了我们12个月 / 12,000英里的保修。
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.
当ECM检测到电路的电压低时，它将触发P2401代码。该代码将保留，直到解决问题或在多次车辆旅行中检测到正常电压为止。
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
清除所有代码
带车辆进行试驾，最好在与冻结框架数据的类似操作条件下
对蒸发系统进行目视检查，以寻找任何破碎或破裂的组件和线条
用盖测试仪测试气盖
使用扫描工具将执行EVAP系统自我测试
烟雾机将用于检查和蒸发泄漏
最后，如果没有其他给出结论性的答案，将对ECM进行测试
The P2401 can be a tricky code to diagnose as there are many different components that can cause it.
通常，燃气盖被更换并清除代码。这可能解决了P2401的某些情况，但不是全部。在代码重新出现的情况下，需要逐步诊断测试才能准确诊断此代码。
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.
当蒸发系统泄漏时，它们通常是蒸气泄漏。这些泄漏通常很小，可以单独查看，并且只能从检查引擎灯或燃油气味中注意到。当这些发生时，使用烟雾机将蒸发系统填充有一种特定的烟雾，以使泄漏出现，以便可以修复它们。
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