clogged or leaking vacuum line for the EGR valve However, if the EGR system doesn't function properly, the combustion temperature will be higher, which in the long run could cause engine damage. If the code P0400 is caused by some minor issue like a faulty EGR temperature sensor and the EGR system works properly, there should be no problem driving. In some vehicles, if the EGR system doesn't work, there might be some engine pinging (detonation) noticeable on acceleration or under load (e.g. If the EGR valve is stuck open, the vehicle will have rough fluctuating idle or stalling. There might be some driveability concerns, such as, surging, poor fuel economy, rough idle, but in some cases there could no noticeable symptoms at all. In most cases, this happens when carbon deposits (soot) clog up the EGR system passages and tubes. The code P0400 is set when the EGR system flow is less than expected. It directs a portion of exhaust gases back into the engine intake to lower the combustion temperature, read more how the EGR system work. The Exhaust Gas Recirculation (EGR) system is a part of the vehicle emission control. Signs of automatic transmission problems.
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