What Does U0007 Mean?
The CAN Low (-) circuit voltage is below normal operating range, typically caused by a short to ground condition. This disrupts the voltage differential needed for proper CAN bus communication.
Safety Warning
Complete network communication loss will disable critical vehicle functions and safety systems. Vehicle is unsafe to drive until condition is corrected.
Common Causes
45%
CAN Low wire shorted to ground or chassis
25%
Failed control module with internal short on CAN Low pin
15%
Damaged connector causing short to ground
10%
Water intrusion creating short circuit path to ground
5%
Damaged harness from chafing or pinching against metal
Diagnostic Steps
1
Step 1: Measure voltage on CAN Low circuit; if below 1.0V with key on, confirm short to ground
2
Step 2: Check resistance from CAN Low to ground with key off and modules disconnected; should be infinite resistance
3
Step 3: Disconnect modules one at a time while monitoring CAN Low voltage to identify module causing short
4
Step 4: Inspect CAN Low wire for insulation damage where harness contacts ground points or sharp edges
5
Step 5: Check connectors for water intrusion, corrosion, or damaged seals that could cause grounding
Estimated Repair Cost
$150 - $1,500
Parts + labor, varies by vehicle and location
The CAN Low (-) circuit voltage is below normal operating range, typically caused by a short to ground condition. This disrupts the voltage differential needed for proper CAN bus communication.
The most common cause of U0007 (High Speed CAN Communication Bus (-) Low) is: CAN Low wire shorted to ground or chassis
Typical repair costs for U0007 range from $150 to $1,500, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Complete network communication loss will disable critical vehicle functions and safety systems. Vehicle is unsafe to drive until condition is corrected.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to U0007 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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