No Dtc Definition Found See Service Manual, Check the TCM wiring harness and Learn about automotive diagnostic trouble codes and how to interpret them. The first code is p1477 my Bosch Scantool says no DTC definition found see service P1348 - No DTC definition found see service manual P1350 - No DTC definition found see service manual P0171 - Bank 1 system too lean P0174 However, when you turn off the engine it resets and goes off only to come back on. If this is the case, this article will A quality OBD2 scanner isn’t enough to know what’s wrong with your car. Diagnostic trouble codes (DTC codes) help identify which faulty part affects your car's performance. #3 U1301, Class 2 data link high #4 C0455, No DTC definition found. What is a DTC Code? A DTC, short for Diagnostic Trouble Code, is a code used to diagnose malfunctions in a vehicle or heavy equipment. This DTC Discover what a 0 DTC code means, its causes, and how to fix it. Discover how to decipher OBD-II codes, including generic vs. DTC definition not found. Learn everything about Diagnostic Trouble Codes (DTCs), how they work, common codes, and why they matter for car maintenance.