Fiat Linea transmission problem

It certainly sounds like you have a problem. The symptoms you describe – transmission indicator light, check engine light, emergency mode, shifting problems, and grinding noises – all point to a potential issue with the transmission control system. The radiator oil pressure could be related, especially if the oil cooler is integrated with the radiator. A defective cable or plug connection is a plausible cause. Have you checked the coolant level recently? A low coolant level, caused by a coolant leak, might affect the oil cooler's performance.

I did check the coolant level, and it seemed fine. Where exactly would I find the cable or plug connection related to the radiator oil pressure, and is it something I can check myself without special tools?

I understand your concern. Without knowing the specific layout of your Fiat Linea's cooling system, I can only offer general guidance. The relevant cable or plug connection would likely be near the radiator or oil cooler, leading to a pressure sensor. However, attempting to diagnose or repair this yourself could be risky without proper knowledge and tools. Given the complexity of the automatic transmission and potential for further damage, I'd strongly advise taking it to a qualified workshop for diagnosis. They can properly check for fault codes and pinpoint the exact problem.

Understood. I took the car to the workshop, and you were right. The problem was indeed a defective plug connection to the radiator oil pressure sensor, as suspected. The repair cost 95€. Thanks again for your help!