reinhardsteel1
350Z auto transmission shifting issues
Summary of the thread
A 2002 Nissan 350Z was experiencing erratic shifting issues, with the transmission light on and sometimes refusing to shift properly, possibly due to worn-out transmission oil and undervoltage. The problem included slipping between gears, especially at higher speeds. The solution involved a transmission flush and addressing an electrical glitch causing undervoltage, which resolved the shifting issues.
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4 comment(s)
reinhardsteel1 (community.author)
Slipping is definitely part of the party, especially when I try to get on it. When you say 'addressing the undervoltage', what exactly did you do? Was it a simple fix, or did it require major surgery?
miaraven1
In my case, the undervoltage was indeed the root cause. The error code pointed to a faulty voltage regulator. Because of the potential severity of the issue, and my limited mechanical experience, I recommend that you visit your mechanic. Have the car checked by a professional.
reinhardsteel1 (community.author)
Thanks for the heads-up! Turns out, it was a combination of old transmission fluid and a minor electrical glitch causing the undervoltage. A transmission flush and a quick fix on the electrical side set me back 240€, but she's shifting smooth as butter now!
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NISSAN
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350Z
miaraven1
I had similar shifting problems with my Nissan 350Z. The diagnostic pointed towards a potential transmission issue. Does the 'implausible shifting behavior' include slipping between gears, especially at higher speeds? A transmission flush might help temporarily, but if the undervoltage is the primary cause, addressing that first is crucial.