What Does U2015 Mean?
A fault exists in the communication signal link preventing proper data transmission between modules. This indicates a physical wiring issue affecting network communication integrity.
Common Causes
35%
Open circuit in one of the communication bus wires (CAN High or CAN Low)
30%
High resistance connection in communication bus circuit due to corrosion
25%
Damaged wiring harness from rubbing, pinching, or rodent damage
10%
Failed splice or poor repair in communication wiring
Diagnostic Steps
1
Step 1: Measure resistance of CAN High and CAN Low to ground separately (should be approximately 60 ohms each on most systems)
2
Step 2: Check for voltage on both CAN High and CAN Low lines with ignition on (should show activity/fluctuation)
3
Step 3: Wiggle test all connectors and harnesses while monitoring communication to identify intermittent connections
4
Step 4: Trace communication wiring through harness looking for damaged, pinched, or repaired sections
5
Step 5: Use schematic to identify all connectors in affected communication circuit and inspect each thoroughly
Estimated Repair Cost
$150 - $1,000
Parts + labor, varies by vehicle and location
A fault exists in the communication signal link preventing proper data transmission between modules. This indicates a physical wiring issue affecting network communication integrity.
The most common cause of U2015 (Signal Link Fault (Non SCP)) is: Open circuit in one of the communication bus wires (CAN High or CAN Low)
Typical repair costs for U2015 range from $150 to $1,000, depending on the vehicle, location, and whether you do it yourself or go to a shop.
May affect communication with safety-critical systems including ABS, stability control, or airbag modules. Recommend repair before extended use.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to U2015 to identify the root cause.
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Quick Info
Category
Network
System
Communication Network
Difficulty
Type
Generic (SAE)
Recommended Tools
OBD2 Scanner
A quality scan tool helps you read codes, view live data, and clear faults.
