U1900
NetworkCan Bushigh severityManufacturer-specificCAN Communication Bus Fault - Receive Error
What U1900 Means
A module detected receive errors on the CAN communication bus. This indicates messages are corrupted or not arriving, disrupting module communication.
Symptoms
- Multiple modules affected
- Warning lamps on
- Systems intermittently inoperative
Common Causes
- Damaged CAN bus wiring
- Faulty module on the bus
- Corroded or loose connectors
- Failed CAN terminating resistor
Diagnostic Steps
- Scan all modules for CAN codes
- Inspect CAN wiring for damage or shorts
- Measure CAN bus resistance (should be 60 ohms)
- Isolate faulty module by disconnecting
🔌 Don't have a code reader?
Any of these will read and clear this code — pick by how deep you want to go.
Budget handheld~$40
ANCEL AD410 →
No-phone-needed handheld — reads, clears, live data, freeze frame.
✓ ANCEL official store
Serious DIY~$100
BlueDriver Pro →
Enhanced codes (ABS, airbag, TPMS) plus repair reports.
SHOP FAVORITEShop-grade tablet~$300
Autel MaxiCOM MK808S →
Bidirectional tests, service resets, all systems.
✓ Autel official store
Pro diagnostics$1,500+
Autel MaxiSys MS906 Pro →
Full-system pro platform — topology mapping, ECU coding, the works.
✓ Autel official store
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