Silly idea maybe, but the Vectra I had used to have had a similar
problem every now and then. Try a hard sharp push down on the tailgate
as though you were slamming it and then try to open it. The Vectra
(spit) tailgate lock used to jam if it wasn't quite down properly and
this latched it just enough to allow the solenoid to do it's job.
Usually if I had stuffed too much in the boot or got something jammed
between the shut and the tailgate.
Cheers Clint, I actually tried this - just to see what would happen.
Sure enough, it popped open.
I've greased everything up now and I'll make sure I get the other half
to slam it properly next time.
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