Q: My headlights flicker when I drive.

asked by on

My headlights seem to flicker when driving. They get brighter or dimmer without me changing anything. What's going on?

There are several factors that can cause headlights to flicker while driving. The more common problems could be related to the headlight bulbs themselves, a weak battery, or even the alternator starting to fail.

If those items are fine, however, then I would have to dig a little deeper and inspect the wiring, relays, switches, and the light sockets. Loose connections, worn-out switches, or burnt relays and sockets can all cause intermittent breaks in power.

Have your lights checked out by a certified mechanic sooner rather than later to keep you from getting stuck driving in the dark without headlights, and to prevent unnecessary damage to your electrical system.

Was this answer helpful?
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details
  1. Home
  2. Questions
  3. My headlights flicker when I drive.

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing

Get a quote

What others are asking

Q: Q: Headlights not working?

The multi-function switch is a common fault with your Chevrolet C1500 Suburban. Sometimes the lights don't work at all. Other times the high beams will work but not the low beams. Moving the column up and down could possibly indicate...

Q: Q: My headlights won't turn off

A fault in the circuit, such as a stuck closed (fused) switch or relay is causing the circuit to stay powered on even after you have commanded the circuit off through the combination switch. To isolate the faulty component, please...

Q: Car won't start, sat for months

Hello. You are on the right track with testing the starter to see if it works. It is also possible that the battery has a bad cell in it and is not strong enough to start the car. I would...

Related articles

How Long Does a Distributor O Ring Last?
The distributor is part of the ignition system in your vehicle and its purpose is to route high voltage from the ignition coil to the spark plug. The spark plug then...
P0240 OBD-II Trouble Code: Turbocharger Boost Sensor B Circuit Range/Performance
P0240 code definition Turbocharger Boost Sensor B Circuit Range/Performance What the P0240 code means P0240 is an OBD-II generic code triggered when the Engine Control Module (ECM) detects the intake boost...
P2428 OBD-II Trouble Code: Exhaust Gas Temperature Too High Bank 1
P2428 code definition A P2428 trouble code signifies that the PCM has detected a problem in the exhaust gas temperature sensor circuit in bank 1, which subsequently contains the number one...