U1139
Severity: MediumSCP (J1850) Invalid or Missing Data for Primary Id
Last updated: July 2026
System
Network
Subsystem
Network Communication
Code Type
Manufacturer-specific
SCP (J1850) Invalid or Missing Data for Primary Id
Last updated: July 2026
U1139 is a manufacturer-specific network diagnostic trouble code. It is defined as "SCP (J1850) Invalid or Missing Data for Primary Id". It falls under the network communication area of the vehicle’s network system, and its exact meaning can vary between manufacturers.
The affected control module sets U1139 when it detects a condition matching "scp (j1850) invalid or missing data for primary id" in the network communication circuit or system. When the fault is confirmed, the module stores the code and, in most cases, turns on a warning light.
This code is generally moderate. The vehicle is often still drivable, but the underlying fault should be diagnosed before it leads to further problems.
U1139 means "SCP (J1850) Invalid or Missing Data for Primary Id". It is a manufacturer-specific network trouble code in the network communication area.
The vehicle is often still drivable with this code, but you should have it diagnosed soon so a moderate fault does not turn into a larger one.
There is no single fix. Start by confirming the code with a scan tool, then work through the likely causes and checks above — inspecting wiring, connectors and the relevant components before replacing any parts. On your specific make, confirm the diagnosis before repairs.
You can clear the code with an OBD-II scan tool, but if the underlying fault is still present it will usually return. Clearing without repair is only useful to confirm whether the fault is active.
This information is provided for general reference only. It is not repair advice and may not apply to every make or model. Manufacturer-specific codes can differ. Always confirm a diagnosis with a scan tool and, where needed, a qualified technician before replacing parts.