Body, generic

B0520 Passenger Door Open Switch

Check engine lightUsually off
EmissionsNot relevant
Drive cycleNot required
Limp modeNo

No accessible J2012 list contains B0520, and its meaning is not published by any carmaker. The code exists at GM: PIP5094, a circuit-testing bulletin for 2014 and earlier GM vehicles, lists it as a keyword but leaves it undefined. The title describes the switch reporting that the front passenger door is opening. GM's 2011 Saab 9-5 monitors the matching right front exterior handle switch as B1474 02 and disables that handle once the line is grounded or stays closed beyond 60 s. Toyota's EP2372055A1 adds a plausibility check for intermittent switch faults: if a smart-key unlock is followed by the key being found inside the cabin without any door-open signal, the switch is judged faulty. Driver side: B0510.

Likely causes

Passenger door switch contacts worn, greased up or frozen
Wire break in the passenger door hinge passage
Exterior handle switch shorted by water ingress
Body or keyless entry module input faulty

Symptoms

  • Passenger door opening not detected by interior light or alarm
  • Passenger exterior handle ignored by the keyless system
  • Auto-lock may relock the car with the key inside

Repair estimate

DifficultyEasyDIY possible
Parts and labour€20–200
Time0.3–1.5 h

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

Parts involved

door jamb switchdoor wiring harnessbody control module

Related codes

B0510B0541B0260

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