P2051 Code Definition
P2051 Reductant Injection Valve Circuit Low (Bank 2 Unit 1)
What Does the Engine Code P2051 Mean?
Character "P" in the first position of Diagnostic Trouble Code (DTC) represents the powertrain system (engine and transmission), "2" in the second position means that this is a ISO/SAE controlled OBD-II (OBD2) DTC. "0" in the third character position in a DTC indicates that the fuel and air metering and auxiliary emission controls is experiencing a malfunction. The last two characters "51" is DTC number. OBD2 Diagnostic Trouble Code P2051 means that Reductant Injection Valve Circuit Low (Bank 2 Unit 1) has been detected.
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How Serious Is the Code P2051?
This issue is not critical yet. Make sure that it is current and fix it early before this leads to more severe issues.