AdBlue tank is filled but will not start the car?

2015 VOLKSWAGEN PASSAT
10,000 MILES • 4 CYL • TURBO • 2WD • AUTOMATIC
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LOGANXD89
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I have 2015 TDI sel pem Passat. AdBlue is filled but won't start the car. it has red sign saying won't start wont AdBlue but i did add the AdBlue car miles is 100,000.
Jan 24, 2024 at 6:58 PM
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JACOBANDNICKOLAS
  • AUTOMOTIVE REPAIR CONTRIBUTOR
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Hi,

It sounds like there is an error in the circuit. Have you checked for diagnostic trouble codes?

I know there is a technical service bulletin related to the light being on due to a reductant line connector issue. I read through it and there must have been some issue when the component was welded. If pressure is too low, it will prevent the operation of the system.

I attached it below so you can see it. Let me know if you can check it and determine if there is a problem.

Take care,

Joe

See pics below.
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Jan 24, 2024 at 7:33 PM
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LOGANXD89
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So, I should just clean in the am and it should fix if that’s issue?
Jan 24, 2024 at 11:12 PM
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LOGANXD89
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I cleaned out the Ablue crystal but still no start.
Jan 25, 2024 at 6:32 AM
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LOGANXD89
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What would be the next step?
Jan 25, 2024 at 6:32 AM
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JACOBANDNICKOLAS
  • AUTOMOTIVE REPAIR CONTRIBUTOR
  • 110,190 POSTS
Hi,

Is there a leak? That is what would cause the low-pressure issues and prevent it from starting. If there was evidence of a leak, it is likely still present.

Let me know.

Joe
Jan 25, 2024 at 6:55 PM
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LOGANXD89
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Maybe I can’t tell but there was crystallized around the wires.
Jan 26, 2024 at 11:28 PM
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JACOBANDNICKOLAS
  • AUTOMOTIVE REPAIR CONTRIBUTOR
  • 110,190 POSTS
Hi,

Something may be corroded. Check to make sure none of the connectors appear damaged, loose, or corroded. If everything appears okay, we need to scan the can-bus to determine what may be causing the issue. However, the idea that it was crystalized likely indicates a leak.

As far as scanning, CAN stands for controller area network. This type of scan will retrieve codes regardless of the module storing them.

Here is a link that explains how it's done:

https://www.2carpros.com/articles/can-scan-controller-area-network-easy

Let me know.

Joe
Jan 27, 2024 at 7:05 PM