What Does U1054 Mean?
Another primary identification data communication fault on the SCP network, similar to U1048 and U1049. Multiple primary ID codes suggest a fundamental network bus failure or multiple module communication problems.
Common Causes
35%
Widespread SCP bus wiring damage or connector corrosion
30%
Failed body control module or generic electronic module
20%
Multiple module power supply or ground issues
10%
Instrument cluster failure affecting network initialization
5%
Short circuit from damaged wiring or aftermarket device
Diagnostic Steps
1
Step 1: Document all stored codes and note which modules are showing communication faults using scan tool module scan
2
Step 2: Perform visual inspection of data link connector and main harness junction points for obvious damage or corrosion
3
Step 3: Check battery voltage under load and verify all main power distribution and ground connections are tight and clean
4
Step 4: Measure SCP bus voltage and resistance values; compare to manufacturer specifications (typically 50-120 ohms between SCP+ and SCP-)
5
Step 5: Begin isolation testing by disconnecting modules one at a time to identify if one module is pulling down the entire bus
Estimated Repair Cost
$150 - $1,000
Parts + labor, varies by vehicle and location
Another primary identification data communication fault on the SCP network, similar to U1048 and U1049. Multiple primary ID codes suggest a fundamental network bus failure or multiple module communication problems.
The most common cause of U1054 (SCP (J1850) Invalid or Missing Data for Primary Id) is: Widespread SCP bus wiring damage or connector corrosion
Typical repair costs for U1054 range from $150 to $1,000, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Multiple vehicle systems may malfunction including instrumentation, lighting, and powertrain controls. Vehicle may enter limp mode or experience reduced functionality. Drive cautiously until repaired.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to U1054 to identify the root cause.
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Quick Info
Category
Network
System
Vehicle Communication Network
Difficulty
Type
Manufacturer
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