Airbag light on: what it means and what not to do

What the airbag light means

At startup the airbag light comes on for a few seconds while the module checks the system, then goes out. If it stays on, flashes, or comes on while driving, the module has stored a fault. On many vehicles, when a fault is present, the module may disable some or all airbags and seat belt pretensioners until it is repaired.

SRS faults are stored as B codes (body) in the airbag module, not in the engine computer. A basic OBD2 code reader reads only engine and emissions codes, so it will usually show nothing. Learn more about code letters in how to use an OBD2 scanner.

Note.Airbags deploy with explosive force. Do not probe airbag connectors with a test light or multimeter, do not unplug airbag components with the battery connected, and do not work on the steering wheel, seats, or dash airbags yourself. Have SRS repairs done by a qualified professional following the manufacturer's procedure.

Common causes of an airbag light

Causes vary by vehicle. These are common across many makes. Your SRS code will narrow it down.

What you can safely do yourself

You can read codes, check the battery, and gather information for the shop. These steps do not involve touching airbag components.

1. 1

   Note when the light comes on and whether it stays on, flashes, or comes and goes.

2. 2

   Check that the battery is healthy and charging. Low voltage can set SRS codes on some vehicles.

3. 3

   Read SRS codes with a scanner that supports airbag systems for your make.

4. 4

   Write down the codes and any descriptions. Do not clear them yet.

5. 5

   Check for open recalls on your vehicle using the NHTSA recall lookup with your VIN.

6. 6

   Take the codes to a qualified shop or dealer for diagnosis and repair.

Scanners that read airbag codes →

What not to do

Clearing an SRS code without fixing the cause only hides the warning for a while, and the system may still be disabled. Bypass devices that make the light go out leave you without working airbags. If the light came on after a collision, the module and other parts may need inspection and replacement following the manufacturer's procedure.

• Do not probe airbag connectors or circuits with a test light or multimeter
• Do not unplug or replace airbags, the clock spring, or pretensioners yourself
• Do not install resistors or bypass devices to turn off the light
• Do not clear the code repeatedly and ignore it if it returns
• Do not buy used airbag parts from unknown sources

Recalls and airbag safety

Airbag inflator recalls have affected many vehicles from several manufacturers. Even if your airbag light is off, check your VIN on the NHTSA recall site. Recall repairs are done by dealers at no cost to the owner. If your light is on, mention any open recall to the dealer.

Seat belts are part of the same system. A fault in a pretensioner or buckle sensor matters even if the airbags themselves are fine. Wear your belt regardless of the light.

Choosing a scanner that reads SRS codes

To read airbag codes you need a scanner with SRS coverage for your make and model. Many mid-range tools read ABS and SRS, and higher-end tools add more systems and service functions. Check the maker's coverage list for your exact vehicle. See scanners for ABS and SRS and ABS light on causes if you have both lights on.

If the scanner also shows a network code such as U0100 or U0001, a communication problem may be behind several warning lights at once. That points to wiring or a module issue rather than an airbag part.

Frequently asked questions

Is it safe to drive with the airbag light on? The car will drive, but the airbags may not deploy in a crash. Get it diagnosed soon and wear your seat belt.

Can I reset the airbag light myself? A capable scanner can clear SRS codes, but only after a professional has fixed the cause. If the fault remains, the light returns. Crash data may need a manufacturer procedure.

Will a generic OBD2 scanner read airbag codes? Usually not. Airbag codes live in the SRS module. You need a scanner with SRS coverage for your vehicle.

Can a weak battery cause the airbag light? On some vehicles, yes. Low voltage can set an SRS code. Fix the battery, then have the code rechecked.