Unpredictable Transmission Shift and Warning Light in 2021 Nissan Qashqai: Seeking Advice

Hey, I actually had a somewhat similar problem with my 2018 Nissan Juke not too long ago. Around 56k KM, my transmission started acting all funny, not shifting smoothly, and I also had this weird warning light. Turned out, it wasn't the parking position switch causing the issue, but the Transmission Control Unit (TCU) was faulty. The TCU is basically the brain of the auto transmission, controlling when and how it shifts. If it's faulty, it can send incorrect signals and cause erratic shifting, hence the unpredictable behavior you're seeing. You mentioned the warning light, and that was the same scenario with me. It's basically the car telling you there's something wrong with the transmission system. It can be a serious issue as it directly affects the performance and safety of your car. So, I'd suggest you discuss this with a trusted mechanic and get the TCU checked. Now, to ease your worry a bit, the fault may not necessarily lead to a full replacement. My mechanic was able to fix the problem by updating and reprogramming the TCU. But of course, every case can be different. Anyway, hope this helps, and your car gets back to running smoothly soon. Best of luck!

(Translated from German)

Hey there, Thanks for the insight! Never thought about the TCU being the culprit but it makes sense. I'm actually relieved it might not need a full replacement. Just wondering though, do you remember approxily how much that set you back? Also, has everything been smooth sailing with your Juke since the repair or have other issues popped up? Appreciate your help!

(Translated from German)

Hey, Yeah, I totally get you. When it comes to car troubles, there's always that looming anxiety of cost - it stings, I know! To fix the TCU, it was a cool 1000 Euro. I know, quite a chunk isn't it? But compared to a full replacement, it was a bit of a relief. As far as my Juke is concerned, it's like it got a new lease on life since the repair. No more crazy shifting and stubborn warning lights, and yeah, that parking position switch issue you were concerned about, gone. Trust me, I had concerns too, but the fix pretty much cleared things up. As of now, it feels like cruising on a smooth highway, absolutely no problems at all, fingers crossed it stays that way! So, give it a shot. Bring your car to a good mechanic and get that TCU checked. It's a fair bet, isn't it? Hang in there, and let's hope your Nissan gets back on the road perfectly soon! Cheers!

(Translated from German)

Hey, I can't begin to appreciate how much you put my mind at ease! A thousand Euro isn't a small amount, but compared to what I had in mind, it's definitely manageable. It’s really assuring to hear how well your Juke is doing after TCU reprogramming, gives me hope for my Qashqai. I am going to make an appointment with a reliable mechanic right away to get this issue checked. Here's hoping it's nothing too drastic and it gets cleared up soon, fingers crossed! I'll definitely update here once it's all sorted out. Thanks again for taking the time to help me out! Your experience and advice have been invaluable. Take care and wish me luck! Cheers!

(Translated from German)