There is no DECODE CEM button when I connect my VC40 to VDASH. What I am doing wrong? Is there a manual for VDASH I can download?
This is correct behaviour. The CEM decoding for SPA platform is not supported thru VDASH (Info to date: 2020-10-16), as described here: https://d5t5.com/article/volvo-cem-pin-code
The only options are bench reading or via an official VIDA.
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However, this is not a condition that this question and answer can only be applied to this car.