U1850
Drive Motor Control Module 2 Lost Communication With Transmission Control Module
U1850 is an OBD-II diagnostic trouble code meaning: Drive Motor Control Module 2 Lost Communication With Transmission Control Module. Common causes: broken or damaged can bus wires, poor contact in ecm or tcm connectors. Estimated repair cost: $56–278.
Symptoms
- The car goes into emergency mode
- Gear shifting problems
- Check Engine light comes on
- Reduced engine power
- Unstable operation at idle
Causes
- Broken or damaged CAN bus wires
- Poor contact in ECM or TCM connectors
- Transmission control module malfunction
- Problems with power supply or grounding of modules
- Software error in one of the modules
How to Fix
- Check the integrity of the CAN bus wiring
- Inspect ECM and TCM connectors for oxidation
- Check power supply and grounding of modules
- Scan both modules for additional errors
- If necessary, replace the faulty module
Related codes
FAQ
What does the U1850 code mean?
U1850 is an OBD-II diagnostic trouble code that indicates: Drive Motor Control Module 2 Lost Communication With Transmission Control Module
What causes a U1850 error code?
The most common causes of U1850 include: Broken or damaged CAN bus wires; Poor contact in ECM or TCM connectors; Transmission control module malfunction; Problems with power supply or grounding of modules.
How do I fix a U1850 diagnostic trouble code?
To fix U1850: Check the integrity of the CAN bus wiring. Inspect ECM and TCM connectors for oxidation. Check power supply and grounding of modules. For a complete diagnosis, use an OBD-II scanner.
Is it safe to drive with U1850?
Limited driving only, diagnose soon
How much does it cost to fix U1850?
The estimated repair cost for U1850 is $56–278. Actual cost depends on your vehicle, location, and labor rates.
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