What Does U1260 Mean?
The positive (+) circuit of the SCP differential bus has failed, either open or shorted. The J1850 protocol requires both differential signals to function properly for reliable communication.
Common Causes
35%
Broken or damaged SCP bus positive wire
30%
Connector terminal corrosion or backing out on SCP+ circuit
20%
Module internal bus driver failure on positive circuit
10%
Short to power on SCP+ circuit from damaged wiring
5%
Water intrusion or corrosion at network module connector
Diagnostic Steps
1
Step 1: Measure voltage on SCP+ circuit with key on (should toggle between 0-7V during communication)
2
Step 2: Check for continuity on SCP+ circuit through entire network harness
3
Step 3: Inspect all connectors on SCP+ circuit for corrosion, damage, or water intrusion
4
Step 4: Disconnect modules one at a time to isolate a module with internal short
5
Step 5: Repair or replace damaged wiring/connectors or replace faulty module
Estimated Repair Cost
$100 - $700
Parts + labor, varies by vehicle and location
The positive (+) circuit of the SCP differential bus has failed, either open or shorted. The J1850 protocol requires both differential signals to function properly for reliable communication.
The most common cause of U1260 (SCP (J1850) Single Ended (+) Circuit Failure) is: Broken or damaged SCP bus positive wire
Typical repair costs for U1260 range from $100 to $700, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Communication failure can disable critical safety systems including ABS, airbags, and traction control. Multiple system malfunctions likely, affecting safe vehicle operation.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to U1260 to identify the root cause.
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Quick Info
Category
Network
System
Network Communication
Difficulty
Type
Manufacturer
Recommended Tools
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