TSB: Rich Air/Fuel Ratio at High Ambient Temperatures
Interesting note found at step one:Originally Posted by NHTSA | March 17, 2015
Now I'm curious to see if I have this label...Check the underside of the hood to verify there is no "Authorized Modification" label (see page 11 for example) previously installed to indicate this reprogramming has already been completed. If a label is present and the "ROM ID#" on the label matches the "New S/W Part No." in the table above, the ECM is at the latest level and reprogramming is not necessary. Conduct normal diagnosis for the described condition.