U0220 code meaning
Lost Communication With Door Switch F
What U0220 means
U0220 reports that door switch unit F has stopped communicating. Water is a well-documented enemy of such units. GM recall 14V404 (bulletin 14309) covered 2005–2007 TrailBlazer, Envoy, Rainier and Saab 9-7X: salty melt water reaching the driver-door module corroded its circuit board, so lock and window switches worked only now and then, windows could move by themselves and the board could overheat; dealers fitted a new module. On 2014–2018 GM pickups and SUVs, bulletin 18-NA-079 traces LIN losses of the driver window switch to water at the door-to-body connector X500, using GM's own code U1538. No manufacturer documents U0220 itself; the letter is assigned per make. No MIL.
U0220 at a glance
- Check engine lightUsually not
- Emissions testNot an emissions code
- Limp modeNot expected
- Repair difficultyMedium, DIY possible
- Typical labor0.5 to 2.5 hours
- Clears after repairWhen cleared with a scanner
Symptoms of U0220
- Window or lock keys work only intermittently
- Window moves without a button press
- Heat or burnt smell at the door switch panel
Common causes of U0220
- Most likelyWater or salt slush inside the switch unit, corroded circuit board
- PossibleCorrosion at the door-to-body connector
- PossibleBroken wire in the door harness
- Less likelySwitch unit failed without visible moisture
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Door switch fLin bus
What each part of U0220 means
| U | Network system: communication between the control modules (CAN bus). |
| 0 | Generic code: it means the same on every make (SAE standard). |
| 20 | The exact fault in that area. |
What to do next
- Note U0220 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 U0220
What does U0220 mean?
U0220 means "Lost Communication With Door Switch F". U0220 reports that door switch unit F has stopped communicating. It is a generic code, so it means the same on every make.
Is it safe to drive with U0220?
U0220 does not normally turn on the check engine light by itself. Watch for the symptoms above and have it checked soon.
Will U0220 fail an emissions test?
U0220 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 U0220 to fix?
Difficulty: medium. A typical repair takes 0.5 to 2.5 hours of work. A careful DIY repair is possible with basic tools and a scanner.
Will U0220 clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.