What are the common causes of U3005?

A short in the retained accessory power wiring. A failed body control module that manages retained accessory power. An aftermarket accessory wired into the retained accessory power circuit. Corrosion in the retained accessory power harness.

Check retained accessory power timing with a scan tool. Inspect the retained accessory power wiring for shorts. Test the body control module output for retained accessory power. Remove aftermarket accessories tied to the circuit. Replace the body control module if the output stays wrong. Clear the code and retest.

U3005

Retained Accessory Power

System: Network communication (U code)
Lamp: Check Engine Light
Category: Network Communications

What it means

U3005 means Retained Accessory Power.

Check these first

A short in the retained accessory power wiring
A failed body control module that manages retained accessory power
An aftermarket accessory wired into the retained accessory power circuit
Corrosion in the retained accessory power harness

What to do next

Check retained accessory power timing with a scan tool
Inspect the retained accessory power wiring for shorts
Test the body control module output for retained accessory power
Remove aftermarket accessories tied to the circuit
Replace the body control module if the output stays wrong
Clear the code and retest

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Updated

Generic SAE J2012 definition. Last updated 2026-10-10.