Network, generic

U049A Invalid Data Received From Door Control Module A

Check engine lightUsually off
EmissionsNot relevant
Drive cycleNot required
Limp modeNo

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.

Likely causes

Chafed wires or loose pins in the door harness between body and door
Driver door module internally faulty, for example after water ingress
Wrong configuration or software after module replacement or retrofit

Symptoms

  • Driver window or mirror switches without function
  • Central locking ignores the driver's door

Repair estimate

DifficultyMediumWorkshop job
Parts and labour€50–700
Time0.5–3 h

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

Parts involved

door control module a

Related codes

U0199U0501U0502U0140

References: static.nhtsa.gov, patents.google.com.