gabrielknight77
Seicento control unit communication error
Summary of the thread
A 2008 Fiat Seicento is experiencing a control unit communication error, leading to engine overheating, check engine light activation, and coolant spills. The suspected cause is a defective cable or plug connection. A similar issue was resolved by addressing a corroded connector near the engine control unit. The recommended solution is to have a qualified workshop perform a thorough diagnostic assessment, which successfully identified and repaired the defective plug connection.
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4 comment(s)
gabrielknight77 (community.author)
Thank you for your response. The diagnostic trouble code indicates a general communication error, rather than a specific module failure. Which connection or wiring harness gave you the most trouble?
alexanderschwarz7
In my case, the fault was related to a corroded connector near the engine control unit. However, since your diagnostic code is quite general, it might be difficult to pinpoint the exact location. Given the overheating and pressure issues, I would strongly suggest taking your car to a qualified workshop. They will be able to perform a more thorough diagnostic assessment. This is how the mechanic resolved it on my car.
gabrielknight77 (community.author)
I appreciate your advice. I took the car to a workshop as you suggested. It was indeed a defective plug connection, as initially suspected. The repair cost was 95€. Thank you!
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FIAT
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SEICENTO
alexanderschwarz7
I had a similar issue with my Seicento. The symptoms you describe sound very familiar. It turned out to be a connectivity issue with one of the control modules, likely a CAN bus error. I would suggest checking all your wiring harnesses and connections, especially around the engine bay. Did the diagnostic trouble code point to a specific module?