matteosilver1

Seat Ateca control unit communication error

I am experiencing a rather perplexing issue with my Seat Ateca, gasoline engine. I am getting a 'Control unit communication error' message. The symptoms include engine overheating, the check engine light illuminating, and a coolant spill under the vehicle, likely due to excessive pressure in the cooling system. I suspect a defective cable or plug connection related to a component. I have performed basic car diagnostics, and the results consistently point to a communication fault. I would appreciate any insights before I delve deeper into this.

4 comment(s)

I had a similar issue with my Ateca, though it manifested slightly differently. Check engine light, yes, but no overheating initially. The car diagnostics pointed to a communication fault within the CAN bus system. Specifically, it was flagging an intermittent loss of communication with the engine control module. Have you checked the integrity of the wiring harness and connectors associated with the engine control module? A loose or corroded connection can easily trigger such a fault.

That is interesting. When you mention checking the wiring harness and connectors, are there any specific points I should be focusing on? Any particular connectors that are known to be problematic on the Ateca? I want to be thorough in my inspection.

In my case, the problem was indeed a corroded connector on the CAN bus, specifically the one going to the engine control module. Visually inspect them for any signs of corrosion, damage, or loose connections. If you are not comfortable doing this, it might be best to take it to a workshop that specialises in car diagnostics. They will be able to check the data link and pinpoint the exact source of the communication fault.

As suggested, I checked the CAN bus connections and wiring harness for the engine control module. Found a corroded connector. Cleaned and resecured it. Car diagnostics confirmed the communication fault is gone. Engine is no longer overheating. Check engine light is off. Coolant leak stopped. Repair cost 95€ for the connector cleaning solution and some contact grease. Thanks for the advice.

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