Successfully added Traffic Jam Assistant to US model -- interested in other people's experience with TJA

I3drivei3 · Oct 10, 2024

I just had Premium Retrofit code my 2015 I3 for lane assist and it works great. I did have to buy the module from them and easily installed it behind the steering wheel in about 10 minutes. Yes, many of your Bimmercode programming will be erased, but you can easily recode. Premium Retrofit stated that they will reprogram for free if the coding ever gets erased.

Fleshy8029 · 2024-11-25T14:32:24-0600

Has anyone purchased a TJA module, had it programmed, and then had it not work? I've never been able to get it to function on my 2019 i3S.

JohnnyCakes · 2024-11-25T14:42:27-0600

Who did the programming? From whom did you purchase the TJA module? Critical facts!

Fleshy8029 · 2024-11-25T14:48:31-0600

It was premiumretrofit who did both. I've been meaning to learn how to program myself but haven't gotten around to it.

JohnnyCakes · 2024-11-25T17:15:01-0600

Fleshy8029 said:
It was premiumretrofit who did both. I've been meaning to learn how to program myself but haven't gotten around to it.

Not to state the obvious, but are you sure you are activating it properly? You have to activate it differently than normal cruise control before it will work. Does anything happen (dash lights) when you turn it on?

Also, what did PremiumRetrofit say? They are an extremely trustworthy and I assume would have your back on getting this to work. If they confirmed your VIN then it should work (it doesn't work on all i3's, specific options required).

Fleshy8029 · 2024-11-25T17:30:50-0600

JohnnyCakes said:
Not to state the obvious, but are you sure you are activating it properly? You have to activate it differently than normal cruise control before it will work. Does anything happen (dash lights) when you turn it on?

Definitely activating properly. When in ACC cruise, hit the increase follow distance button. The dash will light up the TJA icon but say it could not be activated. I could try snapping a photo later this week of it. I've had the module in my car for over a year now, it's never worked once.

When I first had it programed remotely, I couldn't get it to work. A few days later he redid it manually with no change. Neither of us have said anything to each other since. I figure there isn't anything he can do remotely since he already retried, so I've been waiting until I have the time to try programing it myself. He did say that that the TJA module was connected correctly, but also noted that he could not ready any info or error code from my car (which he found interesting, I guess that's never happened before).

I thought I'd bring it up because I haven't found anyone else reporting the TJA modules NOT working.