Network, generic

U051A Invalid Data Received From Door Switch E

Check engine lightUsually off
EmissionsNot relevant
Drive cycleNot required
Limp modeNo

U051A concerns door switch unit E. On a car with four side doors, A to D would already be enough for one unit per door, so E suggests an additional switch location; no manufacturer documents this code or says what E means. Rear or sliding doors with their own electronics are plausible candidates: Yazaki's patent US8304928 describes doors with dedicated controllers, each serving a window switch module, joined to the body network through a LIN sub-bus. One interaction matters for any rear switch: the driver's window lockout blocks rear requests deliberately, so a rear switch that does nothing is not by itself a fault. The code becomes meaningful when frames from unit E contain implausible values; U0219 indicates the unit has gone silent.

Likely causes

Switch unit E internally faulty or water-damaged
Fault on the LIN sub-bus wiring between door controller and switch
Switch variant not matching the vehicle configuration

Symptoms

  • Switch at an additional door position without function
  • Window at that position operable only from the driver's door

Repair estimate

DifficultyMediumDIY possible
Parts and labour€0–350
Time0.3–1.5 h

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

Parts involved

door switch e

Related codes

U0219U0519U0521

References: patents.google.com, en.wikipedia.org.