What Does U0015 Mean?
The negative (CAN Low) wire of the medium-speed CAN bus has an open circuit, meaning the electrical path is broken. This prevents modules on this network from communicating properly, causing loss of functionality in multiple vehicle systems.
Safety Warning
Vehicle may experience loss of critical systems including stability control, transmission control, or instrument cluster. Vehicle may be unsafe to drive or enter limp mode.
Common Causes
35%
Broken or severed CAN Low wire in harness
30%
Corroded or damaged connector pins at module connections
20%
Failed control module with internal CAN circuit damage
10%
Damaged wiring from collision or repair work
5%
Improperly terminated CAN bus or missing termination resistor
Diagnostic Steps
1
Step 1: Measure resistance between CAN Low circuit and ground at multiple points along the network to locate the open
2
Step 2: Inspect all connectors and harness routing for physical damage, corrosion, or disconnected plugs
3
Step 3: Check CAN Low continuity from gateway module to each module on the medium-speed network
4
Step 4: Verify termination resistor values (should measure approximately 60 ohms between CAN High and CAN Low when modules disconnected)
5
Step 5: If wiring is intact, test suspect modules individually by monitoring CAN signals with oscilloscope
Estimated Repair Cost
$200 - $1,500
Parts + labor, varies by vehicle and location
The negative (CAN Low) wire of the medium-speed CAN bus has an open circuit, meaning the electrical path is broken. This prevents modules on this network from communicating properly, causing loss of functionality in multiple vehicle systems.
The most common cause of U0015 (Medium Speed CAN Communication Bus (-) Open) is: Broken or severed CAN Low wire in harness
Typical repair costs for U0015 range from $200 to $1,500, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Vehicle may experience loss of critical systems including stability control, transmission control, or instrument cluster. Vehicle may be unsafe to drive or enter limp mode.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to U0015 to identify the root cause.
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Quick Info
Category
Network
System
Network Communication System
Difficulty
Type
Generic (SAE)
Recommended Tools
OBD2 Scanner
A quality scan tool helps you read codes, view live data, and clear faults.
