[KushalJain]

Need help/advice on my Tata Tiago transmission and ABS Issue.

Car Details:
Tata Tiago XZA+. Purchased February 2021. Odo: 6,000 Kms

Issues:
1. The gears are not shifting properly. 1st gear continues till 35kmph, 2nd gear continues till 40-45. This started only last month and earlier we never faced this
2. ABS Light is ON continuously
3. Check Engine light is ON
4. Engine fan remains ON even after Key is removed and car is shut.

Story so far:
ABS light blinking is an issue 3 TASC couldn't solve. Every time we visited the service station, they would do some kind of reset with their laptop, Light will go off but would be back ON in 1-2 hours

Gear shifting issue: TASC has suggested to go for a Clutch Overhaul (which is not covered in Warranty). When we asked
1. How Clutch overhaul will solve transmission issue?
2. Can you guarantee this will solve it

There was no answer but this is the only solution apparently.

Check Engine Light - That is still to be investigated.

Engine Fan: When asked to multiple TASCs, they said this happens when engine is very hot and the fan continues run to cool engine down. But we are facing this even when we have driven for just 1 km in the morning. For this, TASC didn't have any answer.


Posting to get some help in whether any other Tiago/tata car owners faced similar issue in their 1 year old cars and if the solution suggested by TASC seems reasonable.

[vishy76]

Peculiar issue, however I think this has more to do with an electronic fault than a mechanical one, like a worn out clutch. You first need to know the reason for the CEL. Ask TASS to give you the CEL error code. This should give you a fair hint as to what is wrong with your engine. An engine that isn't performing correctly can make the AMT gearbox behave funny as well, so it's better to concentrate on the CEL and determine exactly what it is for. Software resets don't solve CELs. There's almost always some sort of a hardware intervention or repair needed to extinguish them. I think it might be linked to the radiator fan issue.

Likewise for the ABS error. Ask the ASC to give you the exact error code that shows up on a scan. The error codes should help us understand exactly what has gone wrong with the ABS as well.

Lastly, don't give into changing the clutch. It's too early for the clutch to wear out. Unless and until your car jerks and judders a lot more than you find acceptable, I don't think the clutch assembly needs changing. The fact that the dealership isn't ready to take onus if the issue remains unresolved even after this step further strengthens this possibility.

[Jeroen]

I agree with Vishy76. Depending on the kind of fault, a reset might help. But if it comes back again, obviously a reset is not going to solve the problem. With these kind of problems there might be multiple codes, so make sure they show you all the codes. Only when you have all the codes can you make a proper diagnosis.

It is very unlikely the clutch needs changing. This is most likely an electric or electronical problem. In your case it is most likely there is something wrong with an ABS sensors and that is causing the ABS problem which is causing the transmission problem subsequently.

Good luck

Jeroen

[Jaggu]

Hope all this visits are documented? Ensure it is done and then escalate to Tata and they should be able to guide you to a dealer who would be best equipped to handle the issue along with the regional service manager from Tata. If not put a specific request for regional manager to get involved.

From the looks of it, these are all triggered by some sort electrical or ECU misfires. 6000 kms is too low a mileage for things to break down otherwise, even for a clutch plate wear in an AMT.

[SS-Traveller]

Originally Posted by KushalJain

Tata Tiago XZA+. Purchased February 2021. Odo: 6,000 Kms

Issues:
1. The gears are not shifting properly. 1st gear continues till 35kmph, 2nd gear continues till 40-45. This started only last month and earlier we never faced this
2. ABS Light is ON continuously
3. Check Engine light is ON
4. Engine fan remains ON even after Key is removed and car is shut.

...they would do some kind of reset with their laptop, Light will go off but would be back ON in 1-2 hours

ABS light + Check engine light + AMT shift error + radiator fan not turning off - put together, this looks like some sort of short circuit related to the ECM / BCM. Really need to know the DTC that shows up when connecting through the OBD-II port. Just clearing the codes is not the correct solution.

[KushalJain]

Originally Posted by vishy76

Peculiar issue, however I think this has more to do with an electronic fault than a mechanical one, like a worn out clutch. You first need to know the reason for the CEL. Ask TASS to give you the CEL error code. This should give you a fair hint as to what is wrong with your engine. An engine that isn't performing correctly can make the AMT gearbox behave funny as well, so it's better to concentrate on the CEL and determine exactly what it is for. Software resets don't solve CELs. There's almost always some sort of a hardware intervention or repair needed to extinguish them. I think it might be linked to the radiator fan issue.

Likewise for the ABS error. Ask the ASC to give you the exact error code that shows up on a scan. The error codes should help us understand exactly what has gone wrong with the ABS as well.

Lastly, don't give into changing the clutch. It's too early for the clutch to wear out. Unless and until your car jerks and judders a lot more than you find acceptable, I don't think the clutch assembly needs changing. The fact that the dealership isn't ready to take onus if the issue remains unresolved even after this step further strengthens this possibility.

You were right @vishy76. Turns out, Problem no 4 was the key. Engine Coolant Temperature Sensor was not working. That was the cause of All the other 3 issues.

While TASC team didn't share the exact error codes they got on the scan, what I was told is the normal scan on static vehicle didn't capture this issue. Only when these guys took the car for an extensive road test, error code related to this sensor was flashed.

Further the car spent total 4 days at the workshop. This also was possible only after I escalated this to the regional CRM at Tata Motors who pushed the workshop to diagnose the issue properly.

The engineer also suggested though that that I should buy the "PromiseToProtect" cover which I ended up purchasing.

Attaching the invoice for the sensor here too.