Hi,
Suggest you simply remove the icm and get it to Volvo diagnostics.
They will check out and perform a guaranteed repair. Speak to lucasz.
Volvodiagnostic.com
This is a very common issue on our older xc90's and caused by dry joints on the icm head unit. Extremes of heat from car heating can cause this.
Lucasz will do a great job, he did for me.
Cheers, hope this helps and good luck getting your shunt sorted!
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