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I have a 2009 Nissan Primstar semi automatic and it goes through the gears lovely but every so often when I put it in reverse it won’t go in. It says it’s in first but its not in any gear. then I switch engine of leave it for 30 seconds then start it up and it will go in reverse. Any ideas please.
 

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i would start by changing the transmission fluid, preferably with a flush (if possible), don't know about the semi's but a lot of auto box's i have dealt with have problems because people don't realise they can't treat them like manual box's and leave the oil, on auto box's the run whats called wet clutches (the clutch's run in the transmission fluid) over time as the clutches creak down the material clogs up the box carried by the trans fluid, hence why auto box's and i would assume semi auto have a service schedule for fluid change
 

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i would start by changing the transmission fluid, preferably with a flush (if possible), don't know about the semi's but a lot of auto box's i have dealt with have problems because people don't realise they can't treat them like manual box's and leave the oil, on auto box's the run whats called wet clutches (the clutch's run in the transmission fluid) over time as the clutches creak down the material clogs up the box carried by the trans fluid, hence why auto box's and i would assume semi auto have a service schedule for fluid change
Really need to proof read, meant to say "as the clutches break down the material clogs up the box"
 

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personally i wouldn't know as i try to avoid auto's when i can (generally a specialist area due to the complexity of an auto box) but would certainly stand to reason that if its playing up from being clogged there would be a provision fro flushing, how ever i no there are now two trains of thought on engine flushing so would not like to say 100%, best thing to do is ring a garage who deals with auto's and ask, in theory it shouldn't be an expensive job labour wise assuming the drain and fill plugs on the box are easily accessible
 
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