What Does U1064 Mean?
Another Primary ID on the SCP network is not providing valid data to requesting modules. The presence of multiple sequential U-codes strongly suggests a bus-level fault rather than isolated module issues.
Common Causes
40%
SCP bus open circuit or high resistance in main trunk line affecting multiple modules
25%
Specific control module failure for this Primary ID address
20%
Power supply issue to module preventing proper operation and communication
10%
Broken or corroded solder joints inside module causing intermittent communication
5%
Bus termination problem causing signal reflections and data corruption
Diagnostic Steps
1
Step 1: Verify power and ground to the module associated with this Primary ID
2
Step 2: Check continuity of SCP bus wiring from data link connector through the network
3
Step 3: Measure bus resistance (should be approximately 100-120 ohms with all modules connected)
4
Step 4: Perform voltage drop test on SCP bus circuit looking for high resistance connections
5
Step 5: Swap suspected module with known good unit if available to confirm module failure
Estimated Repair Cost
$150 - $1,400
Parts + labor, varies by vehicle and location
Another Primary ID on the SCP network is not providing valid data to requesting modules. The presence of multiple sequential U-codes strongly suggests a bus-level fault rather than isolated module issues.
The most common cause of U1064 (SCP (J1850) Invalid or Missing Data for Primary Id) is: SCP bus open circuit or high resistance in main trunk line affecting multiple modules
Typical repair costs for U1064 range from $150 to $1,400, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Depending on which module is affected, critical vehicle functions may be disabled. May cause unexpected vehicle behavior or loss of driver information displays.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to U1064 to identify the root cause.
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Quick Info
Category
Network
System
Vehicle Communication Network
Difficulty
Type
Manufacturer
Recommended Tools
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