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Dear ekphrasis,
Hope you're well. Before "whacking" the knob at the top of the shift lever, consider the following.
The spring-loaded button - on the front of the shift lever's knob (Part #6843471) - rests on the top of a plastic rod, that fits inside the square steel shift lever. That plastic rod is not linked (attached) either to the button or to the shift mechanism.
When the shift lever's button is pushed, it rotates and so depresses the plastic rod. The plastic rod is not shown as a separate part on the parts diagrams in Volvo VADIS (the superseded dealer parts/service database). I do not know if that is an oversight, or if the plastic rod is not available as a replacement part and comes with the shift lever knob (Part #6843471, about $80 a Volvo dealer). You might want to call a Volvo parts department, and find out if this plastic rod can be supplied as a "spare part".
It is possible that the plastic rod has worn and/or slipped out of position. This rod is about 7-1/4" long (184mm). The rod is about 1/4" (6.5mm) in diameter.
At the rod's bottom, there's a short, square section, with two holes in it. Below that is a "splined" section, about 3/8" (10 mm) in length.
Whacking the top of the shift lever could fracture the rubber knob and so require replacement. Before doing that, see the FAQs for the procedure to remove the shift lever knob.
Inspect the plastic rod and post your findings.
Hope this helps.
Yours faithfully,
Spook
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