2012 Mercedes-Benz CLS550 Key Won't Turn

Key won't turn in ignition for 2012 Mercedes-Benz CLS550

Find Repair Location
Reviewed by
Devin Cabugcal
Written by RepairPal Car Genius
Updated January 14, 2025
0%
35% chance it's the
Binding Steering Column/Lock
0%
27% chance it's the
Ignition Switch
0%
20% chance it's the
Ignition Key
0%
18% chance it's
Something else
The most common reasons a 2012 Mercedes-Benz CLS550 key won't turn are a binding steering column/lock, an ignition switch issue, or a problem with the ignition key.
  • Binding Steering Column/Lock: A binding steering column or lock can occur due to a worn or damaged steering column assembly or issues with the ignition lock mechanism.
  • Ignition Switch: A faulty ignition switch can prevent the engine from starting or cause intermittent electrical issues, affecting the vehicle's ability to run properly.
  • Ignition Key: A worn or damaged ignition key or ignition cylinder can prevent the key from turning, leading to starting issues.
Proper diagnosis will determine the exact cause of your symptom, saving you money on unnecessary repairs. The diagnostic experts at RepairPal Certified shops have the right tools and experience to solve any symptom.

What are the potential causes for the key not turning in the ignition of a 2012 Mercedes-Benz CLS550?

When faced with the frustrating situation of a key not turning in the ignition of a 2012 Mercedes-Benz CLS550, it's essential to approach the problem methodically. Begin by checking the condition of your key; a worn or damaged key may not engage properly with the ignition tumblers. If the key appears fine, inspect the steering wheel lock mechanism, as it can sometimes engage and create resistance. Gently turning the steering wheel while attempting to turn the key can often resolve this issue. Next, consider the battery; a dead or low battery can prevent the ignition system from functioning correctly, so ensure your battery is charged. If these steps do not yield results, examine the ignition cylinder for any signs of damage or debris that could obstruct the key's movement. Lastly, if the problem persists, the ignition switch itself may be faulty, requiring further investigation. By following this diagnostic approach, you can effectively troubleshoot the issue and determine whether a simple fix is possible or if professional assistance is needed.

What are the common problems that could prevent the key from turning in a 2012 Mercedes-Benz CLS550?

When facing the frustrating issue of a key not turning in a 2012 Mercedes-Benz CLS550, it's essential to understand the common problems that could be at play. One of the primary culprits is the steering wheel lock, which can inadvertently apply pressure on the ignition cylinder, making it difficult to turn the key. Additionally, a worn or damaged key may fail to engage properly with the ignition, leading to similar difficulties. It's also worth considering the ignition cylinder itself; dirt or debris can obstruct its mechanism, necessitating a thorough cleaning or even replacement. A dead or weak battery can further complicate matters, as insufficient power may prevent the ignition system from functioning correctly. Moreover, a malfunctioning ignition switch might not recognize the key, hindering its movement. Lastly, if the steering column is locked due to a mechanical issue or an engaged locking mechanism, this can also prevent the key from turning. By identifying and addressing these potential issues, you can effectively troubleshoot the problem and restore functionality to your vehicle's ignition system.

How urgent is it to address the ignition issue in a 2012 Mercedes-Benz CLS550 when the key won't turn?

Addressing the ignition issue in a 2012 Mercedes-Benz CLS550 when the key won't turn is of utmost importance due to the potential safety risks and the inconvenience it can cause. A malfunctioning ignition can leave you unable to start your vehicle, which poses a significant safety concern, especially in emergency situations. Additionally, being stranded due to a stuck key can lead to frustrating and potentially dangerous scenarios, particularly if you find yourself in an unfamiliar or unsafe location. Moreover, neglecting this issue can result in further damage to the ignition system or related components, leading to more costly repairs down the line. Therefore, it is crucial to act promptly by consulting a qualified mechanic or dealership to diagnose and resolve the underlying problem, ensuring your vehicle remains safe and reliable.

You’ve got options with RepairPal

Whether you need a more accurate auto repair estimate or help finding a reputable shop in your area, we’ve got you covered.