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We just bought a beetle 2.5L convertible with a few problems (including a transmission problem) looking to fix it up.
It's got an 09G automatic triptronic 6 speed transmission.
It had a code 258 for the p88 solenoid so we gave it a go replacing that. It still has the same code and hasn't changed gears since we got it.
We're comfortable trying to replace the valve body if it comes to that but I want to make sure we're proceeding in the right direction before dropping money on something which might not fix the problem. Especially if all it might need is a wire connector or something dumb like that.
 

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http://wiki.ross-tech.com/wiki/index.php/00258

00258 - Solenoid Valve 1 (N88)

Based on the trouble code and "short to ground", i would be checking the wiring and viewing live data to the solenoid in question. Failures of the external wire harness and internal thin plastic harness types; are common and repair/replacement, has solved many problems. Worn and sticking valve bodies; are also common issues and remanufactured valve bodies, have also, been effective fixes. These cannot "fix"'actual internal failures (clutches, hard parts, etc) but anecdotal evidence around here; has shown, many successful repairs, through these less expensive repairs. These have not requiring a full rebuild or replacement; just things, that can be done by yourself, at home by a experienced diy'r. There are no guarantees, it will fix your problem(s) but it is worth a try and the trouble code; is a evidence, of a particular problem with the (N88) solenoid.
 
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