tootal2

I'm getting a u0100 code after replacing the leaking coolent tank

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My coolent tank started leaking and I replaced it. Now I am getting u0100 code. Is this very bad? How do I fix this problem? 

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U0100 is a communications code pcm or bcm is not communicationg with each other or something in the car. did you disconnect any wire harnesses while replacing the tank, or let coolant spill over any electrical connection? 

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I think having the scangage plugged in might be causing the problem. I know antifreeze got on the belts and other parts

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I removed the scangauge and problem seems to have gone away for now. 

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Most all Scan-guages will always do a bypass...Data goes to scan device and is not sent forward..never drive with that connected unless it is a data gather unit sometimes used by insurance companies or employers to monitor speed, braking etc.

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This was a old scanguage 2. My brother had. I hooked it up to see the codes. Thats when problem started after 2 mile drive. The scanguage hasn't been used I 6 years 

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All scan guage units become the 'endpoint' when connected. Some newer models designed to be connected all the time have a pass on connection to the ECM etc..

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