Why are my Mercedes Benz ignition keys not working?

Some of the Mercedes Benz ignition key problems are caused by a defective key, a dead or dying battery, failed Electronic Ignition Switch or EIS, faulty shifter module, or a bad steering wheel module. Mercedes Benz ignition key problems may include key not turning in on ignition, car not starting, and issues in inserting and removing keys.

Why does my Mercedes Benz not turn on?

One of the most common Mercedes Benz ignition key problems that its drivers experience is a key that won’t turn in on ignition. This Mercedes Benz ignition key problem can be caused by the three main reasons – problems with the vehicle’s key itself, problems with other related components, and issues with the ignition lock cylinder.

What to do if the key does not turn in the ignition?

If the key does not turn in the ignition, try moving the steering wheel as you try to turn the key. The steering wheel will feel completely solid if you try to move it in one direction and may move slightly in the opposite direction.

What kind of key does a Mercedes Benz use?

While most Mercedes-Benz cars have the SmartKey some models such as the ML Class, SLK Class, Crossfire used a metal blade key up to 2005. Some models suffer from the defective key tumbler. We have seen cars with as little as 20,000 miles where the tumbler go bad. Make sure the steering wheel is not in a locked position as mentioned above.

What causes a Mercedes Benz key to not turn?

List of common problems and possible solutions 1 Locked Steering Wheel. New drivers always experience this at least once, so we thought we would include it in this list. 2 Discharged Battery Undervoltage. 3 Key Tumbler Defective. 4 Defective Electronic Ignition/Switch System EIS / N73. 5 Smart Key Remote.

Why is my ignition not working on my Mercedes Benz?

It is possible that the battery in the car is defective, as it does not provide the necessary voltage for the ECU and the N73 Electronic Ignition/Starter Switch (EIS) to function properly. If the battery is dead or has low voltage / under voltage, the CAN communication between EIS and N72 may not function properly.

What kind of key do I need to start my Mercedes?

The type of key your Mercedes utilizes will dictate the route of diagnosis and methods of problem-solving when something goes wrong with it. In older Mercedes models, an ignition key may be the primary method of starting, entering, and locking your car. Newer Mercedes models utilize keyless entry remotes or key fobs.

Can a Mercedes-Benz intermittant start at all?

Today we cannot get it to start at all, tried everything. As usual all lights come on, battery is good, key fobs ok etc. Notice there is a tick sound when key is fully wound. will book in to the garage and update on outcome. I had that kind of problem. Lights were OK, also stereo worked etc. It just didn’t start when you turned the key.

What to do if your Mercedes EZs ignition switch is not working?

If the other key works, keep using it for a couple of weeks to verify that the issue is really the key and not the EIS. Try scanning your Mercedes-Benz for fault codes. Ideally using a Start Diagnostic Scanner. This scanner should still retrieve fault codes when the ignition is off.

Can a Mercedes Benz ignition module be repaired?

There are companies that can repair Mercedes-Benz ignition modules. You will need to remove the ignition module from your Mercedes-Benz and ship it one of these companies that can test and repair the EIS-EZS. Once the module is repaired it is returned to you.

Why does my steering wheel not turn when I turn the key?

Turn the Steering Wheel The most common reason that a car key will not turn is that the steering wheel has locked. This will happen when the steering wheel has been moved after the key has been removed from the ignition cylinder. Turn the steering wheel to the right and left.

What to do if your Mercedes ignition switch is not working?

If you have a spare key try to see if you are experiencing the same symptoms with the other key. If the other key works, keep using it for a couple of weeks to verify that the issue is really the key and not the EIS. Try scanning your Mercedes-Benz for fault codes. Ideally using a Start Diagnostic Scanner.

Where is the ignition key on a Mercedes Benz?

There are 4 electronic and/or mechanical modules that are synchronized for everything to work ok: 1. The key (electronic key); 2. The electronic ignition switch (eis, the place where you put your key in); 3. steering locker; 4 the central electronic circuit module.

What does it mean when your ignition key won’t turn?

The key (electronic key); 2. The electronic ignition switch (eis, the place where you put your key in); 3. steering locker; 4 the central electronic circuit module. If only one of them has a problem, the key will refuse to turn.

A problem that Mercedes-Benz owners may face is the key no longer turns in the ignition. This issue is often caused either by a defective key, bad shifter module, a failed Electronic Ignition Switch (EIS) also known as the EIS-EZS or a bad steering lock module (ESL).

What happens if you have an incorrect ignition code?

The chip in the key transmits a specific code, of which there are millions. If this code matches the ones programmed into the vehicle, engine starting is enabled. An incorrect key code, such as from an unprogrammed key or damaged key, would prevent engine starting. Code “confusion,” such as having multiple keys can also occur, preventing ignition.

Why is my Mercedes-Benz C240 key not turning?

What are common reasons my Mercedes-Benz C240 key won’t turn? While there are a variety of reasons your Mercedes-Benz C240 key won’t turn, the most common 3 are a binding steering column/lock, an ignition switch issue, or a problem with the ignition key.

Why is my Mercedes EZs EIS ignition not working?

The only issue here is that if you can’t turn on the ignition, you can’t power on the OBD2 port and the iCarsoft MB II scanner. If the ignition turns on intermittently, consider yourself lucky and scan for codes. Hopefully, there are fault codes that will point you to the problem. Diagnosing Mercedes ignition problems isn’t a simple DIY job.

Why did my Mercedes EIS ignition switch fail?

Mercedes-Benz ignition switch (often referred as immobilizer module) can become faulty and in some cases due to user error. For example, some common reasons why the ignition module failed are: Connecting jump starting cables while key is in the ignition. During any of the above scenarios, the EIS-EZS may lose its memory.

What to do if your Mercedes key won’t turn?

If you have this problem you will have to install a new / virgin EIS. You can not install a used unit because the EIS has to be paired / married to the car using Mercedes-Benz Star Diagnostic Software. They key itself may be the reason why the car doesn’t start. The key may open the doors, but it will not start the car.

Why does the key not turn when inserted in the ignition?

The EIS module could also be the reason that the key does not turn when inserted in the ignition. Many car owners complain that the car starts fine on a warm or hot day but in cold days the car will not start. This may sound strange, but it is reported frequently.

What to do if your Mercedes key is stuck?

This video shows how to fix the problem when your Mercedes key is stuck and won’t turn in the ignition. The video is specific to the W202 chassis (C-Series 1994-1997, C220, C280, etc), but a similar approach to the repair can be applied to other (older) Mercedes vehicles with mechanical locks. Loading…

What causes a locked steering wheel to not turn in?

If a locked steering wheel is the only thing preventing your key from turning the ignition, then follow our instructions below for How to Unlock a Locked Steering wheel and you will be back on the road fast. Problem 2. Dirt, pocket lint or debris (like tape from opening a package) may cause your key not to turn in your ignition lock cylinder.

What causes ignition problems in a Mercedes ML350?

Battery. Most of the Mercedes Benz ML350 ignition problems are caused by either low or dead batteries. If you have an old battery, you might need to replace it with a new one to fix the problem. If your battery is new but you experience ignition issues, you can do a battery check to make sure that it is not the one that causes the problems.

What causes a Mercedes Benz ignition to not turn?

Mercedes EZS EIS Ignition Switch Problem, Cause, Solution. A problem that Mercedes-Benz owners may face is the key no longer turns in the ignition. This issue is often caused either by a defective key, bad shifter module, a failed Electronic Ignition Switch (EIS) also known as the EIS-EZS or a bad steering lock module (ESL).

Can a locksmith make a Mercedes Benz key?

Not all locksmiths can make Mercedes-Benz keys but in most major cities, you will find locksmiths who can make Mercedes-Benz keys. What do you need to order a new key?

What to do if your Mercedes key is damaged?

Use a Mercedes key cover to protect you key from accidental damage. If the key fob shell is damaged, consider replacing you Mercedes key shell with a new one. For some models, you can order a WALLET KEY which will unlock and start the car but doesn’t have the door keyless functions.

Can you replace the ignition switch on a Mercedes Benz?

Many owners go the route of installing ignition switch, ECU, shifter module and other parts from a donor vehicle. You can’t replace the ignition switch only with one from a used Mercedes-Benz. Several parts need to swapped because the stored VIN needs to be the same in all of them.

Why does my Mercedes not start when I turn the key?

Despite this brand’s high quality, though, Mercedes’ can develop problems with or without regular car maintenance. There are a few theories about why your Mercedes refuses to start when you switch the key in the ignition. It is infuriating to slide behind the wheel, turn the key, see dash lights blink, but the engine won’t turn over.

Is there a Mercedes Benz ignition repair service?

Mercedes Benz EIS immobiliser ignition repair service. £150.00. This is a repair service for all Mercedes Benz electronic ignition units, also known as EIS/EZS unit. You will need to remove and send us your ignition unit and we will diagnose and repair any fault you may have with it.

What to do if your ignition key is bent?

Bent keys can sometimes enter the ignition cylinder, but once inside will not line up correctly to allow the car to start. If your key looks visually bent, you can use a non-metal hammer to carefully flatten the key down. Your goal is to use something that will not damage the key, so ideally this would be made of rubber or wood.

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