What Does U1255 Mean?
Similar to U1254, this indicates missing or corrupted network control data messages on the SCP bus. This code may be set by a different module than U1254 or represent a secondary network control failure.
Common Causes
35%
Body Control Module or primary network controller malfunction
25%
Complete loss of one SCP bus circuit (open or shorted)
20%
Power loss to critical network modules
12%
Bus termination or impedance mismatch causing signal reflection
8%
Electromagnetic interference affecting network signals
Diagnostic Steps
1
Step 1: Identify all modules setting U1254/U1255 codes to determine communication pattern
2
Step 2: Test continuity of both SCP bus circuits from end to end
3
Step 3: Verify proper voltage supply to all network modules (check fuses and relays)
4
Step 4: Disconnect aftermarket accessories to rule out interference
5
Step 5: Replace network control module if all circuits test normal
Estimated Repair Cost
$175 - $1,000
Parts + labor, varies by vehicle and location
Similar to U1254, this indicates missing or corrupted network control data messages on the SCP bus. This code may be set by a different module than U1254 or represent a secondary network control failure.
The most common cause of U1255 (SCP (J1850) Invalid or Missing Data for Network Control) is: Body Control Module or primary network controller malfunction
Typical repair costs for U1255 range from $175 to $1,000, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Major vehicle systems may become inoperative. The vehicle may not start or could stall unexpectedly if critical network coordination is lost.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to U1255 to identify the root cause.
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Quick Info
Category
Network
System
Network Communication
Difficulty
Type
Manufacturer
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