IDM Codes | The Diesel Stop
www.thedieselstop.com › threads › idm-codesMay 12, 2016 · 188 Posts. #3 · May 12, 2016. A P1316 means that the IDM has codes stored, nothing more, nothing less. To retrieve those codes from the IDM, you need to run a KOEO or injector electrical self test (buzz test). IMO, don't waste your money on AE when there are other solutions available for far less money.