Adblue metering too low, location of Adblue pump - Mercedes-Benz Forum
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post #1 of 2 (permalink) Old 07-31-2019, 01:10 PM Thread Starter
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Date registered: Nov 2017
Vehicle: 2009 GL320
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Adblue metering too low, location of Adblue pump

Hey all,

I've been getting the CEL with a code that the Adblue metered quantity is too low. I've checked the real-time values and I can see that the metering enable signal has been issued, the metering amount goes up as I watch it and I can see the metering valve occasionally register a value above zero so it looks like the valve is functioning.

The unusual thing I see is that the Pressure in the Adblue delivery pump never goes about 13% (relative whatever that means).

The other thing that occurs to me is that it could be the downstream Nox sensor although I'm not getting any plausibility errors on it.

Does anyone know:
1) What is the normal delivery pump pressure?
2) Where is the AdBlue pump located?
3) How is the metering rate calculated?
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post #2 of 2 (permalink) Old 07-31-2019, 02:15 PM
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Date registered: Mar 2008
Vehicle: 2012 GL 450 4Matic
Location: Kentucky
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The pump is located in the tank under the rear floor. If the pump is bad I would replace the whole tank. Itís cheaper that way.

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