A Guide to the Engine Crankshaft Position Sensor for the 2007-2016 Mercedes-Benz GL450
Stalling, long cranks, or a no-start issue on your GL450 could point to this critical, but replaceable, sensor.
- A failing crankshaft sensor is a common issue that causes no-start, long cranking, and sudden stalling.
- Do not drive your GL450 if you suspect the sensor is failing; stalling can cause a loss of power assist to steering and brakes.
- The sensor is located on the driver's side of the transmission bell housing and can be difficult to access.
- For reliable performance, choose a high-quality aftermarket brand like Hella, Bremi, Delphi, or Vemo over cheaper, unproven options.
Common Symptoms of a Failing Crankshaft Position Sensor
A failing crankshaft position sensor in a 2007-2016 GL450 will usually make its presence known through clear and often severe symptoms. Because this sensor is critical for engine operation, you will likely experience significant drivability problems. The most common signs include the engine cranking for a long time before starting, or not starting at all. You may also experience sudden engine stalling, even while driving, which can be a serious safety concern. Other symptoms include a rough idle, engine misfires, poor acceleration, and reduced fuel economy. In nearly all cases, a faulty sensor will trigger the Check Engine Light on your dashboard.
🎬 Watch: 7 common symptoms of a bad crankshaft sensorWarning: Do Not Ignore These Symptoms
An engine that stalls unexpectedly can lead to a loss of power steering and brakes, increasing the risk of a crash. It is highly recommended to stop driving the vehicle and have it inspected as soon as these symptoms appear.
Choosing the Right Aftermarket Sensor for Your GL450
When replacing the crankshaft position sensor on a German vehicle like the GL450, the quality of the replacement part is crucial. While OEM parts from a Mercedes-Benz dealer are a guaranteed fit, high-quality aftermarket brands offer a reliable and more affordable alternative. For this specific sensor, it is wise to avoid the cheapest options, as they are known to fail prematurely or not work correctly out of the box, leading to the same problems you were trying to fix.
Consider these tiers when shopping:
- Premium Aftermarket (e.g., Hella, Bremi, Delphi, NGK/NTK, Vemo): These brands are often original equipment manufacturers for various car brands and have a strong reputation for quality and reliability. They are engineered to meet or exceed OEM specifications and are an excellent choice for a dependable repair.
- Standard Aftermarket (e.g., Standard Ignition, Walker Products, Spectra): These brands offer a balance of quality and value. They are a good option for budget-conscious repairs, but it's important to ensure the part comes with a good warranty.
For a critical part like the crankshaft position sensor on a GL450, investing in a premium aftermarket brand is highly recommended to ensure longevity and proper engine function.
Pro Tip: Check the Part Number
The 2007-2012 GL450 (X164 chassis with M273 engine) and the 2013-2016 GL450 (X166 chassis with M278 engine) may use different sensors. Always verify the part number or use your vehicle's VIN to ensure you are purchasing the correct sensor 🎬 See this 2007-2012 GL450 sensor replacement walkthrough for your specific year and model.
Cost to Replace the Crankshaft Position Sensor
| Item | Estimated Cost |
|---|---|
| New Aftermarket Part | $24.74 - $108.98 |
| New OEM Part | $70 - $150 |
| Shop Labor | $140 - $250 |
| Total Professional Replacement | $165 - $450+ |
(Note: Costs are estimates and can vary based on your location and the specific repair shop.)
Frequently Asked Questions (FAQ)
Where is the crankshaft position sensor located on the GL450?
The sensor is located on the driver's side of the engine, at the back, where the engine meets the transmission bell housing. It is often positioned above the catalytic converter and can be difficult to access from the top or bottom without removing other components.
Can I replace the GL450 crankshaft position sensor myself?
Yes, this is a DIY-feasible job for someone with moderate mechanical experience. However, access is very tight. The job typically requires removing heat shields and potentially other brackets to reach the single bolt holding the sensor. Some owners find it easier to access from below the vehicle, which requires safely lifting and supporting the car. 🎬 Watch: How to replace the sensor on 2007-2015 models The engine should be completely cool before attempting this repair.
Are there any recalls for this part on the GL450?
There was a recall (NHTSA ID: 08V006) for the crankshaft position sensor on some 2007-2008 GL-Class vehicles, but it was specific to the OM642 diesel engine, not the V8 gasoline engine in the GL450. There are no widespread recalls for this sensor on the gas-powered GL450 models within this year range.
What happens if I use a cheap, low-quality sensor?
Using a low-quality sensor can lead to persistent problems. The vehicle may continue to stall, have trouble starting, or the check engine light may remain on. In many cases, a cheap sensor will fail quickly, forcing you to do the repair all over again. It's best to use a reputable aftermarket brand or an OEM part for this critical component.
Helpful Videos
Technical Specifications
OEM Part Numbers: A2769051500 2769051500 A2729050000 2729050000 6429050000 A6429050000
The sensor is a Hall Effect type with a 3-pin oval connector. It is mounted with a single Torx bolt to the engine block at the transmission bell housing.
We Have This Part in Stock
The information in this article is provided for general reference and educational purposes only. Vehicle specifications, procedures, and part compatibility can vary by production date, trim level, and region. Always consult your vehicle's factory service manual and verify part numbers before purchasing or performing repairs. Safety-critical components such as airbags, seat belts, and braking systems should be installed by a qualified professional.
- Mercedes-Benz GL450:
- 🎬 Helpful Videos
- 🛍️ Shop This Part
- Common Symptoms of a Failing Crankshaft Position Sensor
- Warning: Do Not Ignore These Symptoms
- Choosing the Right Aftermarket Sensor for Your GL450
- Pro Tip: Check the Part Number
- Cost to Replace the Crankshaft Position Sensor
- Frequently Asked Questions (FAQ)
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