ECU hard reset and clear?

2020 BUICK ENCORE
151,189 MILES • 1.4L • 4 CYL • 4WD • AUTOMATIC
Avatar
CRYBABYCHRISHON
  • MEMBER
  • 1 POST
How do I hardreset and clear thee check engine light?
Apr 24, 2026 at 11:23 AM
Repair Safety Notice: This information is for general instructional purposes only. Vehicle repair can be dangerous. Verify all information, follow manufacturer service procedures, use proper tools and safety equipment, and consult a qualified repair shop when needed.
Advertisement
Avatar
STEVE W.
  • AUTOMOTIVE REPAIR CONTRIBUTOR
  • 15,146 POSTS
Disconnecting the battery on any GM newer than 2016-2018 (depends on model) will not erase the codes. To erase them requires a higher level scan tool. Then you need to put the vehicle in accessory mode and clear the codes, turn it off. Wait about 5 seconds and start it. That process clears the current, pending and history codes, however it will not clear any permanent codes. The PCM has to do that after it sees a set number of drive cycles without the fault returning.
Apr 24, 2026 at 7:56 PM
Advertisement