Having a hard time with the doors locking or not locking

The locks on my 2010 Volkswagen Jetta are oddly unresponsive at times. I can’t quite pinpoint a pattern, other than that it started only on the passenger side. Sometimes the doors just won't respond when I hit the lock control on the door or the key fob. My car is well-cared for and has only 60,000 miles on it. What would cause this? I'm really worried about it getting stolen.
Experienced mechanics share their insights in answering this question :
Keyless remotes for the Volkswagen Jetta have been known to act erratically when the batteries are getting low or the remote is defective. First, try replacing the batteries in your remote and verify that the problem is fixed. If problem continues, replace the remote which is malfunctioning. If both remotes are not working, then the body control module will have to be tested. If one or more components are causing the module to not let you lock or unlock the doors, there may be a problem such as an open or short in one of the door switches. A certified mechanic, such as one from YourMechanic, can inspect your doors, diagnose why they won’t lock or unlock, and perform any needed repairs.

How to Identify and Fix Common car Problems ?

Our sources include academic articles, blog posts, and personal essays from experienced mechanics :

Try holding the lock switch up or down and then opening and closing the door repeatedly. If the locks begin to work intermittently, you may have a broken wire. Extremely cold weather has caused the mechanism to freeze.
While there are many different things that can cause your power door locks to fail, the most common causes are: A bad door lock actuator/door lock solenoid. A bad door lock switch. A bad key fob (remote)
The Volkswagen Jetta has known issues with electrical problems. The usual cause is down to loose wiring. Most of the time the loose wiring can be found behind the dashboard.
The door control module (DCM), also called a door control unit (DCU), is a type of automotive electronic that provides intelligent control for vehicle doors, and their peripheral electric parts and components, that enable features such as power windows, anti-pinch technology, central door locking, rearview mirror …
One of the first symptoms of a possible problem with the door lock relay are door locks that function intermittently. If the door lock relay has any internal or wiring issues, it can cause the door locks to function intermittently. The door locks may function correctly one moment, and in the next will cease to operate.
Wiring Problems

Along with the fuse, there are many complex wires that run throughout your Volkswagen. Failure of them often leads to door lock problems, and our technicians will have to repair and reroute the wiring.

While electrical issues seem to plague most Volkswagens, ABS failure, transmission issues, and ignition problems are also common in most models.
Often, the only symptom of a blown fuse will be a small electrical problem in your Volkswagen. Maybe one of the interior lights won`t turn on, or the radio won`t work. These are relatively minor problems, of course–but a blown fuse could also make it so your car won`t start.
If your car`s electrical system is malfunctioning, you may notice that various lights start to dim. Dimming lights indicate charging malfunctions and low system voltage. The culprit could be a dying battery, loose wires, or a malfunctioning alternator belt.
A door lock relay is an electromagnetic switch that uses very little electric power to turn on a bigger current on and off. The central part of a relay is a wire coil that turns into a magnet when current passes through it.
Electric locks require power to unlock the door. Most electric locks use anywhere between 0.25A and 0.5A of current when the voltage supply is 12VDC (VDC refers to volts of direct current).
The solenoid lock denotes a latch for electrical locking and unlocking. It is available in unlocking in the power-on mode type, and locking and keeping in the power-on mode type, which can be used selectively for situations. The power-on unlocking type enables unlocking only while the solenoid is powered on.
The BCM communicates with other on-board computers via the car`s vehicle bus, and its main application is controlling load drivers – actuating relays that in turn perform actions in the vehicle such as locking the doors, flashing the turn signals (in older cars), or dimming the interior lighting.
If only one door isn`t working, there`s likely a problem with a door switch or sensor. If this is the case, you`ll need to have a mechanic take a look at your car. If all of your doors don`t open, you could have a blown fuse.
Broken or damaged electrical wires

A broken wire may be jolted into making a connection. If this is the case, you`ll get intermittent power to the locks when using the fob. This is especially common for the driver`s door, as it is usually used most frequently, making it vulnerable to damaged wiring.

Relevant Questions and Answers :

the most relevant questions and answers related to your specific issue

Driver side door lock button not working, and passenger side sliding door makes a buzzing noise
ANSWER : Hi there. These door issues are common on this vehicle. Most of the time the main issue is the master door lock switch on the driver door. It sounds like you already replaced that. As for the sliding door problem, most of the time, this is a failure within the door module or it can be a connection issue.

I typically take the door apart and check the connections on the module and inside of the door just to make sure that there is nothing apparent in there. If the connections and the wiring are fine, then I use a scan tool to check the module to see what the inputs and outputs are doing. If you need to have this looked at, consider YourMechanic, as a certified mechanic can come to your home or office to diagnose your door problem and recommend a repair.

all doors lock only by inserting key in passenger side door and locking
ANSWER : Your central locking system may have been designed with a control module in the circuit. This is a small computer that is responsible for controlling the different functions of a particular system. It is possible that the module for your central locking system may have shorted out internally preventing particular functions from working properly. I would recommend having a certified technician test your central locking module to determine if all of its functions are working properly.

Driver and Passenger doors won’t lock, but I hear them click and see the locks twitch.
ANSWER : If the same problem is happening even when you use the inside door lock switch then the most likely cause of the locks not moving is going to be weak actuators. You should replace the drivers lock actuator first since it is used the most and you will see it fixes the problem. Then you can replace the other doors as needed.

Having problems with door locks on 08 Cadillac CTS. Driver side door especially and will not lock or unlock with key. Others loc
ANSWER : This is often related to a malfunctioning door lock actuator, a blown fuse or a faulty power door lock switch. When you use the door lock switch in the car it sends a signal to a relay which then activates an actuator inside the door. The actuator is the final step in the process in that it is a small motor with a set of gears that actually locks and unlocks the latch mechanism inside the door allowing the door to open. When this motor is bad, the latch mechanism will fail to operate and cause the door not to unlock as it is designed to. In the case of a bad door lock relay, the power, normally needed to send the signal from the switch when you activate it to the actuator motor is not there. This means the relay is not allowing the circuit to be completed and the actuator motor is not activated. Any of the above may cause your power door lock switches not to work properly and should be diagnosed by a qualified mechanic. I would suggest having a professional from YourMechanic come to your location to take a look at the door locks in your vehicle.

Doors wont lock or unlock with fob or switch?
ANSWER : Hello. Further testing should be done to help solve your problem. Being that the door unlock reprogramming procedure has already been done and the fuses have been checked there’s not much left it could be. When you hit the unlock button you should hear a little noise in each of the doors. If you hear the noise that means that the motor inside of the door actuator is working therefore it is likely the actuator itself as the problem. Though if you do not hear any noise that means it is likely the motor inside of the actuator. The actuator motors are very common failure on Lexus. The Lexus Community is almost an uproar because the a L in Lexus should also stand for luxury but there have been widespread simple problems reported such as this. A technician such as those we have here at yourmechanic will be able to diagnose your door lock issue for you firsthand. But if you consider following the test I suggested that should help you narrow down to a solution as well.

It may also be a beneficial to take a door panel off and probe a multi meter to the door actuator connectors to ensure they are receiving the proper power and ground when the buttons are pressed. If they are that only leaves two things that can be at fault. The door actuator or the motor inside of the door actuator.

Front Passenger Lock sometimes does not lock with a remote control or by locking button located on either doors.
ANSWER : The solenoid is on the door latch and is most likely the cause of the problem for your 2005 Toyota Tacoma. If you want to have this inspected and repaired, a certified technician from YourMechanic can come to your home or office to diagnose your door lock and perform the correct replacement.

Door unlocked alarm, no power window or door lock on driver door only, interior light comes on with L turn signa
ANSWER : Hi there. In general, wiring harnesses are sold by the manufacturer as a whole harness; not individual wires. It is much easier, cost-efficient and safer to replace the entire harness if it’s determined that it is faulty and the source of your alarm / door issue. It would be best to have one of our mobile mechanics come to your location and complete an electrical problems inspection though, as it’s possible that this issue is related to an error code trapped in the ECU. If this is the case, simply clearing the code will resolve the problem. If the issue is determined to be the wiring harness or an exposed wire, they can recommend and most likely complete the repairs as well.

Intermittent central locking issue
ANSWER : Hello there, many common faults will cause your 1995 Subaru Impreza to fail to lock all of the doors intermittently. The first thing to look for in this situation is to inspect the condition of the key, if the key appears worn or the ridges are worn this can cause the key to not fully engage. Other potential issues are the drivers door master switch, a wiring harness fault, or failing lock actuators. A qualified Technician such as one from YourMechanic will be able to diagnose your door lock issues and make any repairs required to resolve the issue.