Originally Posted By: antiqueshell
Originally Posted By: GMBoy
Originally Posted By: GMBoy
dishdude said:The BAD news is that the mechanic he went to cleared the codes so she could drive home thus taking all the valuable evidence with it.
The codes did not have to be cleared to make the car safe to drive home, it was already in limp mode so there was no need to clear any diagnostic codes. Another clueless tech. The dealer MAY be able to retrieve those past codes if the car holds onto them in a separate hard memory in the ECU that can be read with a GM specific scan tool. What I am saying is that the general scan tool that the mechanic used may only erase codes in soft storage.
Nope. Once cleared everything is cleared including history code. No way to retrieve anything.