What Does U0006 Mean?
The CAN Low (-) circuit has an open condition, indicating a break or disconnection in the negative wire of the CAN bus twisted pair. This will prevent proper differential signaling and disrupt network communication.
Safety Warning
Vehicle will experience complete communication failure affecting multiple systems including safety-critical functions. Do not operate vehicle until repaired.
Common Causes
40%
Broken or severed CAN Low wire in harness
30%
Disconnected or damaged connector on CAN Low circuit
15%
Failed control module with open CAN Low pin
10%
Corroded terminal causing complete circuit break
5%
Physical damage from accident or repair work
Diagnostic Steps
1
Step 1: Measure voltage on CAN Low circuit at multiple points; should read approximately 1.5-2.5V with key on if circuit is intact
2
Step 2: Perform continuity test on CAN Low wire from end to end with key off and appropriate modules disconnected
3
Step 3: Visually inspect CAN Low wire routing for cuts, breaks, or damage along entire length
4
Step 4: Inspect all connectors in CAN Low circuit for backed-out pins, terminal damage, or corrosion
5
Step 5: Use wiring diagram to systematically test CAN Low circuit at junction points to locate open section
Estimated Repair Cost
$150 - $1,200
Parts + labor, varies by vehicle and location
The CAN Low (-) circuit has an open condition, indicating a break or disconnection in the negative wire of the CAN bus twisted pair. This will prevent proper differential signaling and disrupt network communication.
The most common cause of U0006 (High Speed CAN Communication Bus (-) Open) is: Broken or severed CAN Low wire in harness
Typical repair costs for U0006 range from $150 to $1,200, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Vehicle will experience complete communication failure affecting multiple systems including safety-critical functions. Do not operate vehicle until repaired.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to U0006 to identify the root cause.
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Quick Info
Category
Network
System
Network Communication
Difficulty
Type
Generic (SAE)
Recommended Tools
OBD2 Scanner
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