U0101Low Priority
Lost Communication with TCM
Category: Network• CAN Communication
4 articles · 2 makes affected
What is U0101?
Lost Communication with TCM (Transmission Control Module). The network cannot communicate with the transmission control module.
Symptoms You May Notice
- ●Check engine light
- ●Transmission stuck in gear
- ●Limp mode
- ●No shifting
- ●Speedometer not working
How to Fix It
- ●Check TCM fuses ($10-$50, beginner)
- ●Repair CAN bus wiring ($150-$500, professional)
- ●Replace TCM ($500-$1500, professional)
- ●Reprogram TCM ($150-$400, professional)
Root Causesfor U0101
Based on 2 owner reports
Common Misdiagnoses
What owners initially thought vs. what actually fixed the problem
- sure whycar is in limp mode(1 reports)
What Didn't Help
Repairs that owners tried but didn't fix the issue
sure why but the car is in limp mode
Owner Statistics
Based on 12,051 real owner discussions • 881 confirmed solutions
$1,143
Average Repair Cost
7%
Success Rate
14%
DIY Repairs
12,051
Data Sources
About This Data
Statistics are aggregated from real owner discussions on Reddit, automotive forums, and YouTube comments. All data is anonymized and represents actual repair experiences reported by vehicle owners.
Frequently Appears With
These codes often appear together in owner reports. Check these if you see U0101.
Based on analysis of 14 owner reports where multiple codes appeared together.