Skip the auto shop - Our mechanics make house calls

Q: Door locks don’t work, don’t all lock consistently

asked by on

The door locks on my 2008 Chevrolet Malibu are absolutely useless! I'm afraid to leave anything valuable in the car because they will lock and unlock on their own. Sometimes they pop up, lock, and then pop back up again. It's a big problem for a car with only 70,000 miles on it! What is causing all of this?

Erratic door operations such as locking or un-locking on their own is a common complaint for GM vehicles. The culprit is most likely the lock actuators in each door. The locking system in your car uses a Body Control Module (BCM) to complete a circuit, which controls the ground for the door lock actuators in each door and the trunk. YourMechanic can test the system, clean the connectors to the BCM and check for corrosion. The actuators are prone to a high failure rate and applying dielectric grease in the terminals when replacing can help keep out any damaging water or moisture in the connectors.

Was this answer helpful?

Need advice from certified mechanic? Get help now!

Over 1000 mechanics are ready to answer your question.
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

Ask a Mechanic
(100% Free)

Have a car question? Get free advice from our top-rated mechanics.

Ask A Mechanic
Over 10,000 questions answered!

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: fuel pressure and map hose

Hello. The first thing that should be done is to retrieve codes. This is an OBD I system, so it is more difficult than the newer OBD II systems. Lacking any codes or scan tool data, I will have to...

Q: Door not opening.

Hello, If the door unlock knob or lever is in the unlock position and the door won't open, there is a good chance that the door latch is broken. The door panel can be removed or the panel may have...

Q: Difficult startup, engine loses power

For a more complete answer I would need a bit more information. Various components of the car can cause a difficult start up and not actually trigger a check engine light. The fuel pump, spark plugs, starter and Crank...

Related articles

How Do Power Car Windows Increase Passenger Safety?
Power windows are responsible for approximately 2,000 emergency room visits every year. When a power window closes, it exerts enough force to bruise or break bones, crush fingers, or restrict an airway. Though...
Rules of the Road For Iowa Drivers
Driving on the roads requires knowledge of the rules, many of which are based on common sense and courtesy. However, even though you know the rules in...
P2103 OBD-II Trouble Code: Throttle Actuator Control Motor Circuit High
P2103 means there is a fault with the throttle actuator control motor circuit, likely due to a defective electrical component or part.