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Discussion Starter · #1 ·
Just the other day while driving my 2001 9-5 SE the TCS OFF light and the gearbox warning light came on, and the car went into limp-home mode.

Just prior to that when I was backing out of my driveway, I noticed a heavy shudder/clunk when putting the car into reverse. I think the car has always done that at some amount but this seemed more noticeable although I could be wrong.

I've looked through many posts online and it seems this could be a bad transmission body valve. However, just to make sure I changed the transmission fluid tonight with DEXRON III because that is what the auto parts guy had as what I needed per his computer system. Further looking into this suggests maybe I should be using 3309. Nonetheless, the transmission fluid was very dirty and looked like it needed changing but it did not resolve the problem. Perhaps I should change it again with the 3309.

My second issue is that the PRND321 lights on my dash are completely dead; none of them are lit at all and no indication on the dash of what gear I'm in. The lights on my shifter bezel work fine.

I used my OBDII reader and there are no error codes.

So my question is that could I have a bad Gear Selector Switch (NPN/NSS) and does that cause my dash indication to be all blank as well as trigger the limp-home mode?

Any advice would be helpful.

Thanks in advance.
 

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Discussion Starter · #3 ·
got lucky

Thanks for the suggestion. I got real lucky. I re-seated the cable connector on the inside of the firewall by the passenger's feet and my transmission seems happy again, plus all my gear selection lights on the dash are live and indicating correctly again.
 
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