Power Window Regulator Failures

Few car problems are as annoying as a window that won't go up, especially when rain is coming. Most of the time, the culprit is the window regulator or the motor attached to it. These are common failures, and knowing the signs can help you avoid a window stuck halfway down.

What a window regulator is

The regulator is the mechanism inside the door that moves the glass up and down. On most modern cars, it's one of two types:

• Cable-driven regulators use thin steel cables wound around pulleys, guided by plastic parts.
• Scissor-type regulators use a pair of crossed metal arms and a toothed gear.

An electric motor drives the regulator. On many cars, the motor and regulator are sold as one assembly.

Signs your regulator is failing

Watch for these symptoms:

• Grinding, clicking, or popping noises when the window moves
• The window moves slowly or stops partway
• The glass tilts or looks crooked in the frame
• The window drops into the door and won't come back up
• You hear the motor run but the glass doesn't move
• The window goes down but won't go up, or the other way around

If you hear the motor but nothing happens, the cable or a plastic part has often snapped. If you hear nothing at all, the motor, switch, fuse, or wiring may be the issue.

Common causes

Regulators wear out for several reasons:

1. Plastic parts break. Cable regulators often rely on plastic pulleys and clips that become brittle with age and temperature swings.
2. Cables fray or snap. Repeated use stretches and wears the cable.
3. Ice and frozen windows. Trying to lower a window frozen to the seal can strain the regulator and motor.
4. Worn or dirty window channels. Extra friction in the rubber run channels makes the motor and regulator work harder.
5. Motor wear. Motors can lose strength or burn out, especially on the driver's window, which gets the most use.

Quick checks before you go to a shop

Some causes are simple to rule out:

• Try the switch on the door and the master switch on the driver's door
• Check whether the window lockout button is on
• Look up the fuse for power windows in your owner's manual
• Listen closely at the door while pressing the switch

If other windows work and you hear the motor hum or click, the regulator is a strong suspect.

What the repair involves

Replacing a regulator means removing the interior door panel, peeling back the moisture barrier, securing the glass, and unbolting the old assembly. Then the technician installs the new part, reattaches the glass, and checks alignment.

Some notes:

• Many shops replace the motor and regulator together if they come as one unit
• Some cars need the window's auto-up and pinch protection reset after repair
• Aftermarket parts vary in quality, so ask what brand the shop uses

Costs depend on the vehicle and part, often from a couple hundred dollars to several hundred per door. Luxury vehicles can run higher.

Temporary fixes for a stuck-open window

If the window falls and you can't get to a shop right away:

• Some people carefully lift the glass by hand and tape it in place
• A heavy plastic sheet taped over the opening can keep rain out
• Avoid slamming the door, which can drop the glass again

These are short-term measures only. Get the regulator replaced soon to protect your interior and keep the car secure.

Is it covered by a service contract?

Power window motors and regulators are body electrical parts. Basic powertrain plans almost never include them. Higher-tier plans, especially exclusionary ones, often do. Check your contract for:

• Whether power window motors and regulators are named, or covered under electrical components
• Any exclusions for glass, weatherstripping, or door trim
• Whether the plan covers the switch as well as the motor

Compare coverage tiers on our plans page.

How Warranty Wizards can help

We help you compare plans from third-party providers and explain which ones include body electrical parts like window regulators before you buy. To see what's available for your car, request a free quote at /get-a-quote/.