I really need help for my 208 GTI

[drawman]

Hello everyone,

I have a 2015 208 GTI

I own a 2015 model 208 gti. I bought the car second hand about a year ago. The previous owner of the car had replaced the original ECU at the Peugeot service due to a malfunction. I started getting malfunctions in my car about 3 months after purchasing it, it cuts off the gas at low speeds and suddenly accelerates, it goes into eco mode and the fault light turns on, the fault light goes off after 5-10 seconds and returns to normal, if I push the car like this three times in a row, the car stops. When I looked at the error codes with the obd device, I saw that I got the code P1632 47. I replaced the vehicle ECU with the original ECU at the service again and continued to drive the car for about 3 months without any malfunctions. Now I started getting the 1632 47 error code again and I almost can't step on the gas in the car I would be very happy if someone can help me.

[Huskyxantia]

Only thing I can suggest is check the looms to the ecu , as far as you can go , knowing wiring from most of these cars was always a bit thin ...might be something like a slight worn outer case and the inner wire touching body of car. Also sockets of the loom check the connections are clean too

[drawman]

I am thinking of completely reviewing the vehicle's electrical system and also checking if there is a burnt socket in the vehicle's ECU. It seems like I will change the vehicle's ECU again depending on the situation. When I went to the previous authorized Peugot service, it was very annoying that they did not do the necessary checks and only changed the vehicle's ECU. I don't know how true it is that they wrote in different forums that the same fault is caused by the throttle body or the vehicle's alternator, but I think I will check them too.

Thanks for advice.

[Huskyxantia]

I've also heard about the alternator throwing out to much or not enough current and it causing other issues, ive also found if looms are some way connected at certain point then it can also make the other part play up when its cause is further back up the loom , might be best to also check all the earth points too

[drawman]

What I can't understand is why I get the p1632 47 ECU fault code every three months. I have changed the vehicle's ECU twice and both times I had no problems for three or four months, but suddenly I start getting this fault. Could the electrical faults we talk about be damaging the vehicle's ECU (I think this also takes 3 or 4 months)

and why does the Peugeot service not check the electrical system after seeing this fault code when the vehicle is getting these faults, but only replaces the vehicle's ECU

I think the Peugeot service in the city I live in does not understand this business and only replaces parts. When I went for the first fault, they said it was due to the catalytic converter and asked me for a fee of around 2000 dollars, I had a hard time convincing them to replace the vehicle's ECU, I don't know if I can complain about this issue anywhere.

[drawman]

Also, when I measured the voltage values ​​at the time of the fault, I saw that the alternator cut off the charge, but I do not know whether the fault occurred due to the charge cut or whether it cut off the charge because it entered limp mode at the moment of the fault, but just in case, I will have my alternator checked.

[Huskyxantia]

Get that checked then it can be ticked off the list , if it's changing current over a period of time and that happens to match when this problem pops up then I'd say there the answer , alternator has a voltage regulator on the back ? I know old ones could be replaced for new not sure about the newer ones , might be worth investigating.

[drawman]

I don't know but I will have someone who knows check it this week.

I also noticed that when the car tries to do a cold start in the morning, it goes into limp mode due to the same fault.

It tries to give high rpm when it first starts, then it fails at about 2000 rpm and the cold start is cancelled.

[Paul-R]

Are you talking about an engine ECU? I'm confused because unless the replacement ECU was new, or a virginised second hand one, then you would have to change other things as well to cope with the different VIN that's permanently coded into the engine ECU.

The statement that you put the original ECU back in further confuses me as that's not a trivial operation normally.

There are many ECUs in modern cars.

[drawman]

Yes, I’m specifically talking about the engine ECU (MEVD17.4.4).

Due to persistent issues related to torque limitation (DTC P1632), I had the ECU replaced at an official Peugeot service. However, I’m not fully aware of the exact procedure they performed. They simply told me that they installed a brand-new ECU to replace the faulty one.

I wasn’t informed whether any other components were reprogrammed or replaced alongside the ECU — such as the immobilizer, keys, or BSI module. So I assume they handled everything internally with dealer-level tools and just delivered the vehicle back with the new ECU in place.

Also, I never used a second-hand ECU or tried to reflash anything myself. Everything was done through the authorized dealer.

[Paul-R]

Thanks for that. Yes, a brand new engine ECU explains why you had no problems with having to replace other items and why you could just pop the old ECU back in.

Now to your problem itself. I've found two posts that may help. Both suggest that your problem might be the throttle position sensor. This sensor contains two resistance tracks and if they stop giving readings which agree with each other then an error is thrown up. I'd start by looking at the sensor. Maybe just taking the connector off and an on a few times first in case it's a bad contact.

viewtopic.php?t=80886
https://www.peugeotforums.com/threads/e ... 47.374234/

[drawman]

Yes, I’ve also come across many cases where throttle body or TPS-related issues caused similar symptoms. But what I find confusing is this:

I didn’t experience the issue again right after replacing the ECU — everything worked perfectly for months. Then suddenly, the exact same issue reappeared, even though nothing else had changed.

So my question is:
If the root cause was really the throttle position sensor (or wiring, etc.), shouldn’t the problem have come back immediately — or at least never gone away in the first place — even with a new ECU?
It feels strange that replacing the ECU temporarily fixed it.

That’s why I’m wondering if there’s something deeper going on — maybe related to how the ECU adapts over time or how intermittent faults behave with sensor feedback

[Paul-R]

Maybe when the engine ECU was being replaced some connection was jiggled around which fixed an intermittent contact for a while?

[drawman]

Yes, I’ve also added that to the list of possibilities — it’s quite likely that something was temporarily resolved just by disturbing a connector during the ECU replacement.

Additionally, according to PSA technical documentation, when a brand-new ECU like the Bosch MEVD17 is installed, it enters a “learning/adaptation phase” where it gradually adjusts fuel trims, ignition timing, and sensor feedback based on real-world engine behavior.

During this period — which can last several weeks or even a few thousand kilometers — the ECU often tolerates small inconsistencies without throwing any DTCs.
However, once this learning period ends, persistent issues (such as sensor mismatches, weak signals, or airflow irregularities) may start triggering fault codes like P1632 again.

So if this is accurate, it could explain why the error only returns after 3–4 months, even though the ECU was brand new. It might not be the ECU failing, but rather the ECU finally recognizing a deeper underlying fault it adapted to earlier.