B0274 code meaning
Trunk Lid Release Switch Circuit
What B0274 means
Nothing public confirms B0274 – the publicly available J2012 tables skip it and no maker explains it. The title refers to the switch the driver or a passer-by uses to release the trunk lid electrically. Saab treats the button separately in the 9-3: the driver door module sets B2730 61 when the trunk button stays active for more than 20 s, after which the lid will not open. Downstream, Saab and GM log the release output itself (9-3 B3265, 9-5 2011 B3265 02 for a grounded relay control line). Remote-release patents such as US4979384A and US3917330A show the basic layout: a switch energises a solenoid or motor in the latch. A switch-circuit fault leaves the lid shut or, if shorted, can pop it open unexpectedly.
B0274 at a glance
- Check engine lightUsually not
- Emissions testNot an emissions code
- Limp modeNot expected
- Repair difficultyEasy, DIY possible
- Typical labor0.3 to 1.5 hours
- Clears after repairWhen cleared with a scanner
Symptoms of B0274
- Boot lid cannot be opened with the button, only by key or remote
- Lid unlatches without anyone pressing the button
Common causes of B0274
- Most likelyExterior release button corroded or full of water and dirt
- PossibleWires broken in the flexible trunk lid hinge loom
- PossibleInterior release button held or jammed by trim
- Less likelyDoor or body module input reading the switch defective
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Trunk release switchBody wiring harness
What each part of B0274 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). |
| 74 | The exact fault in that area. |
What to do next
- Note B0274 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 B0274
What does B0274 mean?
B0274 means "Trunk Lid Release Switch Circuit". Nothing public confirms B0274 – the publicly available J2012 tables skip it and no maker explains it. It is a generic code, so it means the same on every make.
Is it safe to drive with B0274?
B0274 does not normally turn on the check engine light by itself. Watch for the symptoms above and have it checked soon.
Will B0274 fail an emissions test?
B0274 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 B0274 to fix?
Difficulty: easy. A typical repair takes 0.3 to 1.5 hours of work. A careful DIY repair is possible with basic tools and a scanner.
Will B0274 clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.