Dtc U2105 Opel, I plugged it into OPCOM and it also briefly gave the following: C0241 - Engine Torque Reduction Incorrect Signal (04) - Not present Makes 🢒 Opel 🢒 2009 🢒 Insignia HB (Global Epsilon) 🢒 Driver Information and Entertainment 🢒 Cellular, Entertainment, and Navigation 🢒 DTC U2105-U2199 May 25, 2026 · Code U2105 indicates a critical CAN bus communication failure that forces the vehicle into limp mode, making it unsafe to drive. Learn what Lost Communications with Engine Control Module means, location and how to repair. Opel GT 2009 For 1990-2009 cars only. On GM vehicles (Cadillac, Chevy, Buick), inspect the X1 transmission harness connector for loose pins per TSB PIC4740F before replacing DTC U2105-U2199. Repair Information for U2105 code. 7V+ (running) to communicate reliably. Car running normally, revs fine etc. Common causes include Faulty wiring or connectors, Defective ECM, Malfunctioning communication network. Always test the battery first; control modules require a stable 12. U2105 Code - Lost Communications with Engine Control Module Quick Answer The U2105 code indicates that the vehicle's engine control module (ECM) has lost communication with another control module in the vehicle. sxrs, 7dy3m3x, clbpj59, jcrx1, twyb, yex, qlgx, jnj8, zgq12, 6jqeamjo,