QUOTE(SportyHandling @ Mar 19 2022, 10:59 AM)
Based on current information, presumably for the Ford Focus mk3.
TCM Failure for Ford Focus mk3
1. Mileage of failure = 70,271 km ; Time of failure = 7.5 years, 1st time (Sportyhandling)
2. Mileage of failure = 180,000 km ; Time of failure = 8 years, 1st time (Aneip)
3. Mileage of failure = 81,000 km ; Time of failure = ? , 1st time (Ahtiang)
4. Mileage of failure = 150,000 km ; Time of failure = 4 years, 2nd time (Ahtiang)
From this information it appears that the TCM failure is not correlated to mileage and time.
Aggressive driving style is suggested to be a possible reason for a quicker failure of the TCM as suggested by Ahtiang. However, from my understanding the TCM is Transmission Control Module which is supposed to be electronic. I'm not sure how electronic devices can be affected by aggressive driving since it is usually the mechanical devices that will fail more quickly with wear and tear if you drive aggressively. Items such as clutch, brake pads etc.
Anyway, it looks like the maximum lifespan of the TCM so far is 8 years. I suppose there won't be any data of failiures hitting 10 years since the Focus Mk3 was launched around 2012 or 2013.
3. Mileage of failure = 81,000 km ; Time of failure = ? , 1st time (Ahtiang) - 2014 Dec car and 2018 Jan died the TCM. Around 3 years+

I suspect the failure could be the 2 actuator motor that sit inside that TCM. The 2 actuator motor (1 for odd gears and 1 for even gears) send signal to operate the mechanical shift fork within the DCT gear box. There could be life span on these 2 actuator motor. I suspect aggressive driving style trigger the need to change gear rapidly up or down, hence the lifespan could be shorten. This is purely my opinion ya from some reading back then when my TCM died the first round
At the moment, my car is still sitting in Ford Ara Damansara awaiting TCM parts joining the long list from last year. I ask Ford Auto Excellent and they quote me 3.5K for a new TCM replacement with programming. Lead time 1 day to order and ready stock

. So Ford MY is testing my patience on how long I can survived without a car

before I need to pull the trigger

The thing is that when everything is working flawlessly, Focus MK3 is a very fun dynamic car to drive. It hugs the road effortlessly when you go into those long bends and you know you still can push the car further and the chassis still holds (I suspect is the torque vectoring but make sure you have good tyre and not the botaks one

). And when you put it into S mode and floor it for example rite after you exit the toll gate, the car just pull ahead so effortlessly quick on the gear shift. Car handling on B road is also sharp (Ford Fiesta is slightly better if you ask me

maybe the chassis is much compact so the balance is better I feel).
This is what makes me sticking to my Focus MK3. Sadly Ford globally has stopped Focus sales in Asia Pacific, I was eager for MK4 arrival back then...
This post has been edited by -ahtiang-: Mar 20 2022, 07:15 AM