Dash Cam Vertical Lines in Video: Causes and Fixes

What vertical lines look like

Vertical lines in dash cam footage are bright or dark bands that run from the top of the frame to the bottom. They may be a single thin line, a small cluster, or a pattern that covers part of the image. The lines usually stay in the same position even when the camera moves, which sets them apart from reflections or lens flare.

A dash cam exists to document what happens on the road. Crashes remain a leading cause of death in the United States, with the CDC reporting more than 120 people killed every day in motor vehicle crashes, and IIHS counted 39,254 crash deaths in 2024. If vertical lines obscure the plate of another vehicle or the details of an incident, the footage loses much of its value. That makes license plate readability an important thing to preserve.

Image sensor problems

The image sensor is the most common source of vertical lines. A defect in the sensor's readout circuitry can cause an entire column of pixels to produce no signal, which shows up as a line. Heat, impact, or a manufacturing defect can trigger this. If the line is visible in live view and saved files, and it stays fixed as the scene changes, the sensor is the likely culprit.

Some cameras use a rolling shutter, and sensor damage can also create horizontal bands, but vertical lines point to a column readout problem. The physical size of the sensor and its resolution affect image quality, but neither causes vertical lines by itself. You can compare sensor sizes and sensor types when you look for a replacement.

Flex cable and connector problems

Dash cams with a rotating lens, a rear camera, or multiple channels rely on thin flex cables inside the body. A flex cable that works loose or gets pinched can interrupt the data signal and create lines, shimmering, or a distorted image. The lines may flicker, change when you tap the housing, or only affect one camera channel.

If you are comfortable opening the camera, you can inspect the cable that connects the sensor board to the main board and reseat it gently. This fix works best when the lines appeared after the camera was dropped, bumped, or exposed to strong heat. For rear cameras, check the external cable and connectors first. A damaged external cable is easier to replace than an internal sensor issue. Look at rear camera connection types before deciding.

Lens and image processing faults

Not every vertical line comes from hardware. A dirty lens, a scratched lens, or a smudged CPL filter can create streaks that look like lines, especially with strong light. Clean the lens with a microfiber cloth and check the filter if you use one. A CPL filter that is not seated correctly can also cast a shadow across one side of the image.

Image processing settings can sometimes introduce artifacts. If the lines appear only after a firmware update, try a factory reset and then update again. Switching HDR or WDR modes may also change how the sensor is read. Learn more about HDR versus WDR and lens materials if you are considering a replacement.

Diagnose before you replace

Work through these steps before you spend on a new camera. The goal is to tell a sensor fault from a cable fault or a dirty lens.

• Clean the front and rear lenses with a dry microfiber cloth.
• Remove any CPL filter and shoot one clip without it.
• Check the boot-up live view: if lines are present before recording starts, the issue is sensor or cable, not the card.
• Try a different microSD card to rule out file corruption.
• Reseat internal flex cables only if you are comfortable and the warranty allows it.
• Test the camera in another vehicle or power source to rule out interference.
• Update the firmware and do a factory reset.

Repair or replace?

Once you know the cause, you still need to decide whether a repair makes sense. A dirty lens has no repair cost. A loose cable may be free to fix. A failing sensor usually means a new main board, and that part can cost as much as a new camera. Labor adds more.

If the camera is under warranty, contact the manufacturer before opening it. Opening the housing can void coverage. If the warranty has expired, compare the price of a repair with the price of a new dash cam. For most sensor faults, replacement is the practical choice. See our guide to dash cam repair versus replacement for a fuller breakdown.

If you decide to replace it, browse the best 4K dash cams or the best front and rear dash cams.

Preventing vertical lines

Some causes are avoidable. Mount the camera so it is not exposed to direct sun for long periods, because heat stress can damage the sensor over time. Route cables with gentle curves and avoid pinching them behind trim panels. When you clean the lens, use a soft cloth and never apply pressure to the lens barrel.

Choose a camera from a maker that publishes clear specifications and offers firmware updates. A higher-resolution sensor does not prevent vertical lines, but a well-designed camera with a good operating temperature range is less likely to develop heat-related image faults.

What to pick for your use

Questions

Can a vertical line be fixed with software?

No. A vertical line is caused by the sensor, the cable, or the lens. Resetting the camera or updating firmware only helps if the line is an image-processing artifact, which is rare. If the line is still there after a reset and a lens cleaning, replace the camera.

Are vertical lines covered by warranty?

Most makers cover sensor and main board defects under their standard warranty. Check the warranty terms before opening the housing, because taking the camera apart can void coverage. If the line appeared after a drop or water exposure, it is usually not covered.

Can a bad microSD card cause vertical lines?

A bad card can cause footage to stutter, freeze, or fail to save, but it does not normally cause a fixed vertical line in live view. If the line appears in live preview, the issue is not the memory card.

Is a vertical line the same as a dead pixel?

A dead pixel is a single dot. A vertical line is usually a column of pixels or a readout issue, so it points to a bigger sensor or cable problem. Both can be permanent and may require a new camera.

Should I replace the whole camera or just the rear camera?

For a rear camera with external cable damage, replacing the cable or the rear camera module is often more practical. If the line is in the main front camera, the sensor or main board is usually involved and replacement is the better choice.