Gear selector problems with a 2008 Holden Astra CDX

Rather than an internal transmission problem, this is probably a simple case of loose fittings where the selector meets the gearbox or even where the selector pivots inside the centre-console. The moving parts inside this mechanism can wear over time and lead to sloppiness in the shift lever itself. You can remove the centre-console panels and see for yourself if there’s excess play or movement in the connections. The fix might be new bushes or guides, but it shouldn’t be a huge job.