OBD2 Code: U1048

Description: SCP (J1850) Invalid or Missing Data for Primary ID

Definition: This code indicates that there is an issue with the communication network in the vehicle, specifically related to the Serial Communication Protocol (SCP) using J1850. The system has detected invalid or missing data from a primary control module, which can affect various functions and operations of the vehicle.

U1048 – SCP J1850 Invalid or Missing Data for Primary ID

Severity: Critical

Common Causes

U1048 – SCP J1850 Invalid or Missing Data for Primary ID

Common Causes:

• Malfunctioning or damaged SCP (Standard Corporate Protocol) module
• Communication issues between the SCP module and other modules in the vehicle
• Faulty wiring or connections in the communication network
• Interference from aftermarket electronic devices affecting data transmission

 

Common Misdiagnosis

SCP (J1850) Invalid or Missing Data for Primary ID:
Common Misdiagnosis: Replacing the PCM (Powertrain Control Module) without checking the integrity of the communication network or wiring issues.

 

Common Diagnostic Steps

OBD2 Code: U1048
Description: SCP (J1850) Invalid or Missing Data for Primary ID

• Check the vehicle’s battery voltage and ensure it is within the specified range.
• Inspect all related wiring harnesses and connectors for signs of damage, corrosion, or disconnection.
• Use a scan tool to check for any additional trouble codes that may be present and address them as necessary.
• Verify the integrity of the communication network by performing a continuity test on the SCP (J1850) bus circuit.
• If equipped, update or reprogram the vehicle’s control modules with the latest software version available from the manufacturer.
• If all else fails, consult a professional technician for further diagnosis and repair.