U3022 Ignition Input Accessory/Off

U3022 is the last of the ignition input codes and, by its name, covers a line or line state that belongs to Accessory and Off together, i.e. to all positions in which the engine is not meant to run. GM's 2012 pickup wiring manual has a comparable case: its coded Off/Run/Crank circuit shows one common state for key out and for accessory, separate from key in, run and crank. A module that sees this accessory/off state while the network reports run or crank, or the opposite with the vehicle parked, logs U3022. No manufacturer documents U3022 publicly. In practice the code is less about a single dead wire than about two signals disagreeing, so stored codes for U300C, U300F or U3011 in the same module are useful hints as to which circuit is wrong.

Likely causes

Symptoms

• Accessory functions behaving wrongly for the key position
• Stored together with other ignition input codes in the same module

Repair estimate

Typical range across vehicles; the real cost depends on what the testing finds.

Parts involved

Related codes

References: law.cornell.edu, gmupfitter.com.