2002 Audi TT P0601 OBD2 Code: How to Diagnose and Fix ICM Issue Without Replacement
Is there a way to diagnose or repair the ICM (Ignition Control Module) specifically for P0601 fault, or is module replacement the only viable solution? The vehicle is stock with no modifications such as tuned ECM. While some Technical Service Bulletins (TSBs) exist—like TSB 2017905 01 and A241007—there is limited evidence that these apply to a 2002 model year, which may have been affected by this issue long before the TSBs were issued. Can a reflash or diagnostic test resolve P0601 without replacing the ICM?
The vehicle is stock with no modifications such as tuned ECM. There are some Technical Service Bulletins (TSBs) available, including TSB 20179005 01 and A241007, which may offer a reflash solution. However, given that the 2002 Audi TT model predates these updates, it's unlikely that such fixes would be effective. Replacement of the ICM is typically considered the most reliable option for resolving P0601 in this year and trim.