What Does U0063 Mean?
The positive and negative wires of communication bus D are shorted together. This creates a zero-voltage differential, completely preventing network communication on this bus.
Common Causes
35%
Crushed or pinched wiring harness shorting CAN D+ and CAN D- together
25%
Damaged connector with crossed or touching pins
20%
Faulty control module with internal short between CAN pins
12%
Liquid intrusion causing conductive path between bus wires
8%
Improper repair or aftermarket installation crossing wires
Diagnostic Steps
1
Step 1: Measure resistance between CAN D+ and CAN D- with ignition off; should read 60 ohms, not near zero ohms
2
Step 2: Disconnect modules one at a time while monitoring resistance to isolate short location
3
Step 3: Inspect connectors for bent pins, corrosion, or foreign material bridging terminals
4
Step 4: Check wiring harness for physical damage, especially at flex points and mounting brackets
5
Step 5: Verify proper pin assignments at each connector using wiring diagram to rule out miswiring
Estimated Repair Cost
$150 - $1,000
Parts + labor, varies by vehicle and location
The positive and negative wires of communication bus D are shorted together. This creates a zero-voltage differential, completely preventing network communication on this bus.
The most common cause of U0063 (Vehicle Communication Bus D (-) shorted to Bus D (+)) is: Crushed or pinched wiring harness shorting CAN D+ and CAN D- together
Typical repair costs for U0063 range from $150 to $1,000, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Complete loss of bus D communication will disable multiple systems potentially including airbags, ABS, and stability control. Vehicle may be unsafe to operate and may not start.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to U0063 to identify the root cause.
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Quick Info
Category
Network
System
Vehicle Communication Network
Difficulty
Type
Generic (SAE)
Recommended Tools
OBD2 Scanner
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