U049A code meaning
Invalid Data Received From Door Control Module A
What U049A means
U049A reports implausible data from door control module A, usually the driver's door: the unit that runs window lift, lock and mirror and reads the door switches. The body controller or gateway still hears it but rejects the content because a value is undefined, a counter jumps or a checksum fails. Chrysler's bulletin 08-061-12 for the 2005-2010 300 and Charger names the lost-contact partner U0199 the driver door module (DDM), with front windows and locks dead; a Yazaki patent shows how such a door unit relays CAN commands to its motors over a LIN sub-bus. No maker documents U049A publicly; U0501 to U0503 cover doors B to D. Expect a driver's door that ignores its switches or central locking; no MIL.
U049A 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 U049A
- Driver window or mirror switches without function
- Central locking ignores the driver's door
Common causes of U049A
- Most likelyChafed wires or loose pins in the door harness between body and door
- PossibleDriver door module internally faulty, for example after water ingress
- Less likelyWrong configuration or software after module replacement or retrofit
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Door control module a
What each part of U049A means
| U | Network system: communication between the control modules (CAN bus). |
| 0 | Generic code: it means the same on every make (SAE standard). |
| 9A | The exact fault in that area. |
What to do next
- Note U049A 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 U049A
What does U049A mean?
U049A means "Invalid Data Received From Door Control Module A". U049A reports implausible data from door control module A, usually the driver's door: the unit that runs window lift, lock and mirror and reads the door switches. It is a generic code, so it means the same on every make.
Is it safe to drive with U049A?
U049A does not normally turn on the check engine light by itself. Watch for the symptoms above and have it checked soon.
Will U049A fail an emissions test?
U049A 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 U049A to fix?
Difficulty: medium. A typical repair takes 0.5 to 3 hours of work. This is a job for a workshop.
Will U049A clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.