U1900
CAN Communication Bus Fault
U1900 is an OBD-II diagnostic trouble code meaning: CAN Communication Bus Fault. Common causes: broken or damaged can bus wires, short circuit in can circuit. Estimated repair cost: $6–111.
Symptoms
- Check Engine light comes on
- Incorrect operation of various vehicle systems
- Dips in engine power
- Disabling certain features (such as cruise control)
- Errors in the operation of the dashboard
Causes
- Broken or damaged CAN bus wires
- Short circuit in CAN circuit
- Malfunction of one of the electronic control units
- Poor contact in CAN bus connectors
- Problems with power supply to one of the modules
How to Fix
- Check the integrity of the CAN bus wiring
- Inspect connectors and contacts for oxidation
- Check power supply of all connected modules
- Scan all control units for errors
- If necessary, replace damaged wires or faulty modules
Related codes
FAQ
What does the U1900 code mean?
U1900 is an OBD-II diagnostic trouble code that indicates: CAN Communication Bus Fault
What causes a U1900 error code?
The most common causes of U1900 include: Broken or damaged CAN bus wires; Short circuit in CAN circuit; Malfunction of one of the electronic control units; Poor contact in CAN bus connectors.
How do I fix a U1900 diagnostic trouble code?
To fix U1900: Check the integrity of the CAN bus wiring. Inspect connectors and contacts for oxidation. Check power supply of all connected modules. For a complete diagnosis, use an OBD-II scanner.
Is it safe to drive with U1900?
Limited driving only, diagnose soon
How much does it cost to fix U1900?
The estimated repair cost for U1900 is $6–111. Actual cost depends on your vehicle, location, and labor rates.
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