High Speed CAN Communication Bus (+) High

Description

The CAN High wire voltage is higher than expected, indicating a short to battery voltage.

Symptoms

• CAN bus communication failure
• Multiple module faults
• Warning lights on

Common Causes

• CAN H wire shorted to battery power
• Wiring harness damage
• Module internal fault driving CAN H high

Diagnostic Steps

1. Measure CAN H voltage (should not exceed 4V)
2. Inspect wiring for shorts to power wires
3. Disconnect modules to isolate fault
4. Check for wiring harness rub-through

Repair Notes

Repair the short to power on CAN H. Often caused by wiring harness rubbing against sharp edge.

Related Codes

Other Network Codes

U0005 on Other Vehicles

Common Questions

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