U1849
Drive Motor Control Module 1 Lost Communication With Transmission Control Module
U1849 is an OBD-II diagnostic trouble code meaning: Drive Motor Control Module 1 Lost Communication With Transmission Control Module. Common causes: open or short circuit in the can bus, engine control module (ecm) malfunction. Estimated repair cost: $17–89.
Symptoms
- Check Engine Light Is On
- The car goes into emergency mode
- Gear shifting problems
- Reduced engine power
- Unstable operation at idle
Causes
- Open or short circuit in the CAN bus
- Engine control module (ECM) malfunction
- Problems with the automatic transmission control module (TCM)
- Poor contact in connectors
- Damage to the wiring harness between the ECM and TCM
How to Fix
- Check the integrity of the CAN bus with a multimeter
- Inspect ECM/TCM connectors and contacts for oxidation
- Scan both modules for errors
- Check power and ground of modules
- If necessary, replace damaged wires or connectors
Related codes
FAQ
What does the U1849 code mean?
U1849 is an OBD-II diagnostic trouble code that indicates: Drive Motor Control Module 1 Lost Communication With Transmission Control Module
What causes a U1849 error code?
The most common causes of U1849 include: Open or short circuit in the CAN bus; Engine control module (ECM) malfunction; Problems with the automatic transmission control module (TCM); Poor contact in connectors.
How do I fix a U1849 diagnostic trouble code?
To fix U1849: Check the integrity of the CAN bus with a multimeter. Inspect ECM/TCM connectors and contacts for oxidation. Scan both modules for errors. For a complete diagnosis, use an OBD-II scanner.
Is it safe to drive with U1849?
Yes, but get it checked soon
How much does it cost to fix U1849?
The estimated repair cost for U1849 is $17–89. Actual cost depends on your vehicle, location, and labor rates.
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