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Just an update: after replacing the DMTL pump, the check engine light has not come on yet, and all seems to be working fine.
Doing a Google search on DMTL, it seems like there are many similar issues reported in various BMW forums for various BMW models.
FYI, in one of the posts on another site that I came across in my search on DMTL pump, someone had posted the following on what DMTL does: (I am not sure how correct it is, I am just copy/pasting it here as general info)
"This is how I understand the system to work. The DMTL (Diagnostic Module Tank Leakage) pump tests the fuel tank and fueling components for leaks by slightly pressurizing the fuel tank and evaporative components. The DMTL pump contains an integral DC motor which is activated directly by the ECM which then monitors the pump motor operating current as the measurement for detecting leaks. The fault is set when pump amperage is above 40ma for 10 seconds, and seen for at least 4 drive cycles."
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