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U1806: SCP (J1850) Lack of Acknowledgment for Primary Id

OTHER
System
Manufacturer-Specific Network

What Does U1806 Mean?

U1806 is a manufacturer-specific diagnostic trouble code: SCP (J1850) Lack of Acknowledgment for Primary Id. This code applies to OTHER vehicles. Unlike generic OBD-II codes, manufacturer-specific codes are defined by the vehicle maker and may only apply to certain makes and models.

Symptoms of U1806

Frequently Asked Questions

What does U1806 mean?
SCP (J1850) Lack of Acknowledgment for Primary Id. This is a manufacturer-specific code for OTHER vehicles.
Which vehicles get code U1806?
This code appears primarily in OTHER vehicles. Check your owner's manual or a dealer for model-specific information.
Can I fix this myself?
Manufacturer-specific codes often require a brand-specific diagnostic scanner for full data. A dealer or specialist with the right tools will diagnose it most accurately.

What To Do Next

  1. 1
    Find your vehicle above

    Click your make and model for real owner reports and common causes specific to your vehicle.

  2. 2
    Check for recalls

    Go to nhtsa.gov/recalls and enter your VIN. Free repairs if covered.

  3. 3
    Get a professional diagnosis

    A code alone doesn't identify the exact failed part. A diagnostic ($50–$150) pinpoints the root cause.

Related Codes

U1900 CAN Communication Bus Fault U1798 SCP (J1850) Lack of Acknowledgment for External Access (Doors) U1950 UPB Communication Bus Fault U1797 SCP (J1850) Lack of Acknowledgment for Door Locks U1794 SCP (J1850) Lack of Acknowledgment for Mirrors U1750 SCP (J1850) Lack of Acknowledgment for Audible Warnings U1736 SCP (J1850) Lack of Acknowledgment for Telltales