B0270 code meaning
Passenger Door Lock Switch Circuit
What B0270 means
Public evidence for B0270 is lacking: it is absent from every publicly available J2012 list, and no manufacturer describes it. The title points to the lock/unlock rocker in the front passenger door. Saab, for instance, files that switch in the 9-3 (2003–2012) under its own number B3270: when the passenger door module reads a grounded switch line, the button is ignored and central locking only responds to the remaining controls. In the active-low input of US5619075A a pressed switch pulls the module input to ground. A circuit fault therefore means the module sees a button held permanently, never pressed or giving an implausible level. Remote key and driver switch normally keep working; the driver-side switch has its own code, B0265.
B0270 at a glance
- Check engine lightUsually not
- Emissions testNot an emissions code
- Limp modeNot expected
- Repair difficultyEasy, DIY possible
- Typical labor0.4 to 1.5 hours
- Clears after repairWhen cleared with a scanner
Symptoms of B0270
- Passenger door lock button has no effect on central locking
- Doors lock or unlock by themselves when the switch line is shorted
- Remote key and driver switch still lock the car normally
Common causes of B0270
- Most likelyLock rocker in the passenger door worn, sticking or contaminated
- PossibleSwitch signal wire chafed to ground or broken in the door hinge passage
- PossibleWater ingress or corrosion at the door trim switch connector
- Less likelyDoor or body control module input stage faulty
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Door lock switchBody control moduleDoor harness
What each part of B0270 means
| B | Body system: airbags, seat belts, power seats, lights and climate control. |
| 0 | Generic code: it means the same on every make (SAE standard). |
| 70 | The exact fault in that area. |
What to do next
- Note B0270 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 B0270
What does B0270 mean?
B0270 means "Passenger Door Lock Switch Circuit". Public evidence for B0270 is lacking: it is absent from every publicly available J2012 list, and no manufacturer describes it. It is a generic code, so it means the same on every make.
Is it safe to drive with B0270?
B0270 does not normally turn on the check engine light by itself. Watch for the symptoms above and have it checked soon.
Will B0270 fail an emissions test?
B0270 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 B0270 to fix?
Difficulty: easy. A typical repair takes 0.4 to 1.5 hours of work. A careful DIY repair is possible with basic tools and a scanner.
Will B0270 clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.