U1002 — SCP (J1850) Invalid or Missing Data for Primary Id

What Does U1002 Mean?

U1002 is a manufacturer-specific diagnostic trouble code: SCP (J1850) Invalid or Missing Data 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 U1002

⚠️ Check engine light on
⚠️ Multiple warning lights
⚠️ Electrical system issues

Frequently Asked Questions

What does U1002 mean?

SCP (J1850) Invalid or Missing Data for Primary Id. This is a manufacturer-specific code for OTHER vehicles.

Which vehicles get code U1002?

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
Find your vehicle above
Click your make and model for real owner reports and common causes specific to your vehicle.
2
Check for recalls
Go to nhtsa.gov/recalls and enter your VIN. Free repairs if covered.
3
Get a professional diagnosis
A code alone doesn't identify the exact failed part. A diagnostic ($50–$150) pinpoints the root cause.

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