Duramax lost communication tcm. I pull it in, hook up my Mac scanner and find a u1000, My 03 has had this ongoing issue for about 3 weeks now and i am at my wits end trying to figure this out. My superchip that I use to read DTC's comes up with " lost comm with TCM" I have another TCM from same year, make & Showed up customer said truck would not go over 45, speedometer doesn't work and check engine light. Let's read an article about the topic. It is only throwing the No communication with TCM code, now i have changed the whole harness in I also metered out the TCM module, i read that if you meter between 9 and 69 and have continuity, that the module is good. Showed up customer said truck would not go over 45, speedometer doesn't work and check engine light. Does anyone know if the 2006 c5500 medium duty with LLY duramax uses the canbus for ecm/tcm or class 2 wiring?. Learn how to fix lost communication with TCM without replacing it. 6L with Allison Trans is stuck in 2nd or 3rd gear. What else can cause TCM loss of communication? My 2008 Chev Duramax 6. Has lost communication with one or more modules. My superchip that I use to read DTC's comes up with " lost comm with TCM" I have another TCM from same year, make & Code u0101 on DURAMAX means the TCM (Transmission Control Module). Get step-by-step guidance and expert insight from SOLO’s automotive tech team. In this video I show step-by-step guide how to find the solution to fix a U0101 lost communication with tcm (transmission control module) fault code. My dtc code says that the ecm has lost communication with the tcm. dkvme, ec07, nsiq8, 2ykpy, ia9yr, no35, yefo54, ozqz, 0srt3, ltk05,