U0199 code meaning
Lost Communication With Door Control Module A
What U0199 means
U0199 reports that door control module A has dropped off the bus; most makers assign it to the driver's door. Chrysler bulletin 08-061-12 (300 and Charger 2005-2010) calls it the driver door module: the front windows and central locking stop working, a one-minute battery disconnect is tried first, and the module is replaced if contact does not return. Volkswagen tech tip 97-21-02 (Atlas, Golf, Jetta, Tiguan, Taos 2019-2022) sees U019900 or U020000 with many warnings and windows moving on their own, caused by loose pins in the connector at the driver's A-pillar, on the comfort CAN lines. Ford SSM 53980 (F-Super Duty 2023-2025) blames ground G201, to be torqued to 8 Nm. U0200 to U0202 cover doors B to D, U049A invalid data. Normally no MIL.
U0199 at a glance
- Check engine lightUsually not
- Emissions testNot an emissions code
- Limp modeNot expected
- Repair difficultyMedium, DIY possible
- Typical labor0.5 to 3 hours
- Clears after repairWhen cleared with a scanner
Symptoms of U0199
- Power windows and locks on the door inoperative
- Windows move on their own or several warning lamps light up
- Mirror adjustment or switch lighting dead
Common causes of U0199
- Most likelyLoose or backed-out pins in the door-to-body connector (VW)
- PossibleBroken wires in the door hinge harness
- PossibleLoose ground connection (Ford G201)
- PossibleDriver door module faulty (Chrysler 300/Charger)
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Door control moduleCAN bus wiring
What each part of U0199 means
| U | Network system: communication between the control modules (CAN bus). |
| 0 | Generic code: it means the same on every make (SAE standard). |
| 99 | The exact fault in that area. |
What to do next
- Note U0199 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 U0199
What does U0199 mean?
U0199 means "Lost Communication With Door Control Module A". U0199 reports that door control module A has dropped off the bus; most makers assign it to the driver's door. It is a generic code, so it means the same on every make.
Is it safe to drive with U0199?
U0199 does not normally turn on the check engine light by itself. Watch for the symptoms above and have it checked soon.
Will U0199 fail an emissions test?
U0199 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 U0199 to fix?
Difficulty: medium. A typical repair takes 0.5 to 3 hours of work. A careful DIY repair is possible with basic tools and a scanner.
Will U0199 clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.