Locking mechanism not working on passenger door.

If the central locking system is not working on your Citroen C2 and the garage has quoted a high price for a new key and programming, here are a few things you can check:

1. Check the fuses: Check the fuses for the central locking system. It's possible that a blown fuse could be causing the issue.
2. Check the battery: Ensure that the car battery is fully charged and functioning properly. A weak or dead battery can cause issues with the central locking system.
3. Check the wiring: Check the wiring for any damage or loose connections. The wiring for the central locking system is located behind the door panels.

Regarding the passenger door, if it is permanently locked, you can try the following steps to manually unlock it:

1. Remove the door panel: Remove the door panel to gain access to the lock mechanism.
2. Manually unlock the door: You can try to manually unlock the door by using a flathead screwdriver or a slim jim to manipulate the lock mechanism.
3. Check the lock mechanism: Once the door is unlocked, check the lock mechanism for any damage or wear. Replace any damaged parts as needed.

If you're not comfortable with these steps or if the issue persists, it's best to have a professional mechanic diagnose and repair the issue. They will have the knowledge and equipment necessary to properly diagnose and fix the problem.

Sorry Andrew , no BCM on this vehicle . The Central Security Module is incharge of power door locks . Central Security Module For additional information, refer to Section 419-10 .
The central security module is equipped with a battery back-up which holds the programmed transmitter(s) memory in the event of the vehicle battery disconnection.
Principles of Operations The Door Switch Lock Function When a door lock switch is moved into the lock position or a door lock cylinder is rotated to the lock position, the door lock switch grounds the lock circuit input to the central security module. The central security module then provides 12 volts to one side of the door lock actuators contained in the door latch unit and simultaneously grounds the other side of the door lock actuators. This completes the door lock actuator circuit, causing the door lock actuators to rotate a cam assembly, which then locks the doors.

The Door Switch Unlock Function When a door lock switch is moved into the unlock position, the door lock switch grounds the unlock circuit input to the central security module. The central security module then provides 12 volts to the opposite side (relative to locking the door) of the door lock actuator(s) contained in the door latch unit and simultaneously grounds the other side of the door lock actuator(s). This completes the door lock actuator circuit, causing the door lock actuator(s) to rotate a cam assembly in the opposite direction, which then unlocks the door(s). The 12 volts which the central security module provides to the door lock actuator(s) are provided to each door lock actuator from the individual pins on the central security module connector.

Keyless Entry When a remote transmitter button is depressed, it transmits the appropriate command to the central security module as a radio frequency. The central security module receives the command from the remote transmitter through an antenna, which is incorporated in the central security module.
When the central security module receives a command from the remote transmitter, it then sends the appropriate output to control the desired devices. These outputs devices include:

• The front and rear door lock units.
• Central timer module (CTM).
• The liftgate release motor.
• The right and left side turn signal lamp(s).

The central security module sends a signal to the CTM when courtesy lamp illumination is required.
Computer Operated Locks Each front door lock actuator contains a bipolar motor that controls the lock and unlock linkage. The lock/unlock lever of both front door interior handles use linkage to actuate the lever lock switch located inside each front door lock actuator. Each lever lock switch remains in the unlock position until lock/unlock lever of the interior door handle is moved to the lock position. This action toggles the lever lock switch to the lock position. The central security module uses only one electrical input for both lever lock switches. The central security module cannot determine whether the driver or passenger door lever lock switch was actuated. Therefore, actuating the lock feature from either front door will have the same affect of locking all doors. Actuating the unlock feature will not unlock any other door.
The door lock control switches for both front doors also use only one input to the central security module.
Both rear passenger doors contain a rear door lock actuator that controls only electric lock or unlock of the door. Actuating the lock/unlock lever at either rear passenger door will have no effect on other doors.
The panic feature of the remote transmitter sounds the vehicle horn when the vehicle is not equipped with anti-theft. If the vehicle is equipped with anti-theft feature, a separate horn is sounds for the panic feature.

Change/repair the central locking motor inside the door.

is the locking system mechanical,electrical,vacuum????. If mechanical:linkage came loose?,if electrical:loose or broken wire?,if vacuum:vacuum line punctured ,pinched or broken??, Don't buy parts unless you pinpoint the problem. Alberto

(door lock actuator)all doors have one in them, they weeken, and sometimes work to open, and some times to lock, or not at all. only fix is to replace each of them as they go out, usually cost abt 20 to 40 bucks a piece

If the key turns in the lock, but does nothing, then the linkage has become disconnected or broken. The key is mechanical to the lock and the lock has a electrical switch to operate the central locking unit. Could be a simple broken clip from the lock barrel. Hope this helps

Check the alignment with the door pin. Might be out of adjustment and will not let the door close all the way. That will cause the lock to not be operable. Good luck and have a great day.

No, likely to be caused by the actuators in the lock mechanism failing usually causing the door to remain locked. The boor door can also fail this way, as do the front side doors. Replacement requires the whole lock unit to be replaced at a cost of roughly £60 a lock, and a hours work. Helps if you have small hands. Requires a full strip down of the door and you will need the lock unit, trim clips (a few quid) and a trim removal tool (tenner). You can bodge with a flat head screwdriver, but the tool does help prevent damage to the clips & trim panel.

Faulty door lock solenoid.Try locking it from the passenger door.Or boot.

I have same problem
Found parts of a corroded spring in door mechanism
New spring solved the problem