U3022 code meaning
Ignition Input Accessory/Off
What U3022 means
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.
U3022 at a glance
- Check engine lightUsually not
- Emissions testNot an emissions code
- Limp modeNot expected
- Repair difficultyMedium
- Typical labor0.5 to 3 hours
- Clears after repairWhen cleared with a scanner
Symptoms of U3022
- Accessory functions behaving wrongly for the key position
- Stored together with other ignition input codes in the same module
Common causes of U3022
- PossibleContact resistance in the ignition switch giving an in-between level
- PossibleInput wire open, shorted or backfed
- Less likelyBody control module broadcasting a wrong power mode
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Ignition inputIgnition switchIgnition wiring
What each part of U3022 means
| U | Network system: communication between the control modules (CAN bus). |
| 3 | Reserved range, usually generic. |
| 22 | The exact fault in that area. |
What to do next
- Note U3022 and any other codes stored with it: several codes together often point to one cause.
- Check for loose connectors and damaged wiring around the parts the code names.
- Check open recalls for your car: some faults are fixed for free by the dealer. Enter your VIN.
- Clear the code only after the repair. If it comes back, the fault is still there.
Buying a used car? Scan it for stored codes before you pay. A recently cleared memory can hide a problem.
Questions about U3022
What does U3022 mean?
U3022 means "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. It is a generic code, so it means the same on every make.
Is it safe to drive with U3022?
U3022 does not normally turn on the check engine light by itself. Watch for the symptoms above and have it checked soon.
Will U3022 fail an emissions test?
U3022 is not an emissions code, so on its own it usually does not fail an emissions test. Other stored codes or a lit check engine light still can.
How hard is U3022 to fix?
Difficulty: medium. A typical repair takes 0.5 to 3 hours of work. This is a job for a workshop.
Will U3022 clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.