What Does U0005 Mean?
The CAN High (+) circuit voltage is above normal operating range, indicating a short to voltage source or abnormal voltage condition. This prevents proper communication signal levels on the network.
Safety Warning
Network communication failure will disable multiple vehicle systems including critical safety features. Vehicle operation is unsafe until repaired.
Common Causes
40%
CAN High wire shorted to power source or another voltage circuit
30%
Failed control module with internal short to voltage on CAN High pin
15%
Damaged connector causing cross-connection with power circuit
10%
Incorrect wiring repair shorting CAN High to power
5%
Aftermarket accessory incorrectly wired into CAN bus
Diagnostic Steps
1
Step 1: Measure voltage on CAN High circuit; if above 4.0V with key on, confirm short to voltage condition
2
Step 2: Check for voltage on CAN High with key off; any voltage present indicates short to constant power source
3
Step 3: Disconnect modules systematically while monitoring CAN High voltage to identify source of high voltage
4
Step 4: Inspect harness for damage where CAN wiring runs parallel to power distribution circuits
5
Step 5: Check for incorrect repairs, splices, or aftermarket installations that may have crossed circuits
Estimated Repair Cost
$150 - $1,500
Parts + labor, varies by vehicle and location
The CAN High (+) circuit voltage is above normal operating range, indicating a short to voltage source or abnormal voltage condition. This prevents proper communication signal levels on the network.
The most common cause of U0005 (High Speed CAN Communication Bus (+) High) is: CAN High wire shorted to power source or another voltage circuit
Typical repair costs for U0005 range from $150 to $1,500, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Network communication failure will disable multiple vehicle systems including critical safety features. Vehicle operation is unsafe until repaired.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to U0005 to identify the root cause.
OBDHut Mobile App
Scan codes directly from your car with the OBDHut app.
Coming Soon
Quick Info
Category
Network
System
Network Communication
Difficulty
Type
Generic (SAE)
Recommended Tools
OBD2 Scanner
A quality scan tool helps you read codes, view live data, and clear faults.
