What Does U0067 Mean?
The positive wire (Bus E+) voltage is measuring below specification, typically shorted to ground or experiencing excessive current draw. This prevents proper communication voltage levels on the differential bus network.
Safety Warning
Vehicle may not start or critical safety systems will be disabled due to communication failure. Driving is not recommended as ABS, airbags, and stability control may be inoperative.
Common Causes
45%
Short to ground in Bus E positive wire causing voltage to be pulled low
30%
Failed control module with internal short pulling Bus E+ line to ground
15%
Damaged connector allowing moisture intrusion and creating ground path
8%
Chafed wiring at flex points rubbing against chassis ground
2%
Aftermarket accessory installation causing inadvertent ground connection
Diagnostic Steps
1
Step 1: Measure voltage on Bus E positive line with ignition on (should be 2.5V nominal with valid signal)
2
Step 2: Disconnect modules one at a time while monitoring Bus E+ voltage to isolate short circuit source
3
Step 3: Perform resistance to ground test on Bus E positive wire with all modules disconnected
4
Step 4: Inspect wiring harness for damage, particularly at flex points, through firewalls, and near chassis
5
Step 5: Repair identified short circuit and verify Bus E+ voltage returns to specification
Estimated Repair Cost
$120 - $1,000
Parts + labor, varies by vehicle and location
The positive wire (Bus E+) voltage is measuring below specification, typically shorted to ground or experiencing excessive current draw. This prevents proper communication voltage levels on the differential bus network.
The most common cause of U0067 (Vehicle Communication Bus E (+) Low) is: Short to ground in Bus E positive wire causing voltage to be pulled low
Typical repair costs for U0067 range from $120 to $1,000, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Vehicle may not start or critical safety systems will be disabled due to communication failure. Driving is not recommended as ABS, airbags, and stability control may be inoperative.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to U0067 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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