tootal2 3 Posted October 3, 2017 Share Posted October 3, 2017 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? Link to post Share on other sites
Mr.tozzi 66 Posted October 3, 2017 Share Posted October 3, 2017 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? Link to post Share on other sites
tootal2 3 Posted October 4, 2017 Author Share Posted October 4, 2017 I think having the scangage plugged in might be causing the problem. I know antifreeze got on the belts and other parts Link to post Share on other sites
tootal2 3 Posted October 4, 2017 Author Share Posted October 4, 2017 I removed the scangauge and problem seems to have gone away for now. Link to post Share on other sites
Retired old Gearhead 201 Posted October 5, 2017 Share Posted October 5, 2017 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. Link to post Share on other sites
tootal2 3 Posted October 6, 2017 Author Share Posted October 6, 2017 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 Link to post Share on other sites
Retired old Gearhead 201 Posted October 9, 2017 Share Posted October 9, 2017 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.. Link to post Share on other sites
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