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ECU and corrosion

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New User

Oct 27, 2017, 7:40 AM

Post #1 of 6 (606 views)
ECU and corrosion Sign In

Can anyone with ECU repair experience comment on whether or not corrosion is a common cause of ECU problems or failure? Thank you.

Tom Greenleaf
Ultimate Carjunky / Moderator
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Oct 27, 2017, 8:09 AM

Post #2 of 6 (596 views)
Re: ECU and corrosion Sign In

Corrosion is a high cause of problems wherever found. Common? Depends on where and what exposed to of course.

Here's inside one but pic probably wont show - sorry.........


Ultimate Carjunky / Moderator
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Oct 27, 2017, 8:11 AM

Post #3 of 6 (591 views)
Re: ECU and corrosion Sign In

Which ECUs?

GM van PCM had issues with the aluminum housings corroding externally, especially with road salts. Internal corrosion really only happens if water is able to leak into the ECU. Most ECUs are sealed, have conformal coatings, or are potted.

Modern OEM manufacture ECUs are very robust.

Since we volunteer our time and knowledge, we ask for you to please follow up when a problem is resolved.

(This post was edited by Discretesignals on Oct 27, 2017, 8:18 AM)

New User

Oct 27, 2017, 8:51 AM

Post #4 of 6 (568 views)
Re: ECU and corrosion Sign In

Thank you for your reply. Regarding this pictured example and other corroded PCB's you may have seen, are these from older vehicles? If so, what is the average age of the vehicles where you have seen corroded PCB's?

The other reply from discretesignals suggests that recently manufactured vehicles offer very robust corrosion protection. Would you agree?

Hammer Time
Ultimate Carjunky / Moderator
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Oct 27, 2017, 8:59 AM

Post #5 of 6 (566 views)
Re: ECU and corrosion Sign In

Corrosion will only occur on ANY control unit if it is exposed to elements. As a rule they are not exposed unless some other defect causes it like a water leak in the vehicle that lands on or near the unit. This would be an exception.


We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.

New User

Oct 30, 2017, 4:48 AM

Post #6 of 6 (512 views)
Re: ECU and corrosion Sign In

I have heard and seen corrosion in ECU's from various OEM's. Isn't potting used to reduce corrosion?

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