Engine Crankshaft Position Sensor: A Guide for the 2001-2014 Mercedes-Benz CL600
A failing crankshaft position sensor can leave your V12 engine dead in its tracks; learn how to choose the right replacement part.
- A failing crankshaft sensor will typically cause a crank-no-start condition or sudden stalling, especially when the engine is hot.
- The diagnostic trouble code P0335 is the most common indicator of a faulty crankshaft position sensor.
- For a critical component on a CL600, it is highly recommended to use the OEM supplier brand, Bosch, for the replacement part to ensure reliability.
- The sensor is located in a very tight space at the back of the engine, making replacement a challenging DIY job that requires specific tools like an E8 socket and long extensions.
Is Your CL600 Stalling or Refusing to Start? It Could Be the Crankshaft Sensor.
A faulty crankshaft position sensor is a common issue on many Mercedes-Benz vehicles, including the CL600. The symptoms often start small but can quickly lead to a car that won't run. A classic sign is an engine that cranks but won't start. Another common complaint is the engine stalling unexpectedly while driving, which can be dangerous. Often, these problems are intermittent and may only happen when the engine is hot. You might let the car cool down for a couple of hours, and then it will start right up, only to stall again later.
Choosing the Right Aftermarket Sensor: Brand Quality Matters
When it comes to critical electronic sensors for a high-performance engine like the one in your CL600, brand quality is extremely important. While many aftermarket options are available at a low price, owner and mechanic experiences strongly suggest sticking to the Original Equipment Manufacturer (OEM) brand.
Aftermarket Brand Tiers for CL600 Crankshaft Sensor
| Tier | Brands | Notes |
|---|---|---|
| Tier 1: OEM Supplier | Bosch | Bosch is the original equipment manufacturer for many Mercedes-Benz sensors. Choosing a Bosch-branded sensor, even from an aftermarket retailer, is the safest bet for reliability and proper function. It is designed to meet the precise requirements of your vehicle's computer. |
| Tier 2: Reputable Aftermarket | Hella, Beck Arnley, Standard Ignition (SMP) | These brands have a generally positive reputation. Hella is a well-known German parts manufacturer. Beck Arnley and Standard Motor Products often provide quality parts that meet or exceed OE specifications. However, for a critical sensor like this, most experts would still recommend paying a little extra for Bosch. |
| Tier 3: Value Brands | Dorman, Walker Products, Vemo, True Tech, etc. | While these brands offer a cost-effective solution and their parts are tested, they are generally considered a budget option. For a high-strung V12 engine, using a value-brand sensor can be a gamble that might lead to continued issues or premature failure, requiring you to do the job all over again. |
A Word of Caution on "White Box" Parts
Be wary of unbranded or "white box" sensors. While some may be genuine parts with the manufacturer's logo removed, many are lower-quality copies. Given the critical function of this sensor and the difficulty of replacement, it's not worth the risk to save a few dollars.
Known Issues, Recalls, and Service Bulletins
While searches for the 2001-2014 CL600 specifically did not reveal recalls for the crankshaft position sensor, Mercedes-Benz has issued recalls for this part on other models, particularly those with diesel engines, for similar stalling issues. The failure mode—an interruption of the electrical signal causing the engine to shut down—is consistent across models. There are no specific Technical Service Bulletins (TSBs) found for the CL600 related to this part, but it is a widely acknowledged failure point in online owner forums.
Frequently Asked Questions (FAQ)
Where is the crankshaft position sensor located on the CL600?
The crankshaft position sensor is located on the driver's side of the engine, at the rear where the engine meets the transmission (on the bell housing). It is notoriously difficult to see and access, often requiring the removal of the air filter housing and MAF sensor housing. The job is typically done by feel rather than by sight.
What tools are needed to replace this sensor?
You will need a ratchet with several long extensions, a universal joint, and an E8 external Torx socket. Because the bolt is hard to reach and easy to drop, some mechanics recommend stuffing a rag below the work area and using a small piece of paper in the socket to hold the bolt securely.
Can a bad crankshaft sensor cause other warning lights?
Yes. A failing crankshaft position sensor will almost always trigger the Check Engine Light. A common diagnostic trouble code (DTC) associated with this failure is P0335 (Crankshaft Position Sensor "A" Circuit Malfunction). In some cases, erratic signals can also cause BAS/ESP lights to appear.
Why does the sensor often fail only when the engine is hot?
Crankshaft position sensors are electronic components that sit in a very hot area of the engine bay. As they age, the internal electronics or wiring can become sensitive to heat. When the engine warms up, the sensor's components can expand or lose conductivity, causing the signal to cut out. After cooling down, the connection is restored, and the car starts again. This is a classic symptom of impending failure.
Technical Specifications
OEM Part Numbers: 0031532728 0031532828
The sensor is a magnetic or Hall effect type sensor held in place by a single E8 Torx bolt. It has a 2-pin electrical connector. The OEM Bosch version often has a metal body, while some aftermarket versions are plastic.
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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 CL600:
- 🛍️ Shop This Part
- Is Your CL600 Stalling or Refusing to Start? It Could Be the Crankshaft Sensor.
- Choosing the Right Aftermarket Sensor: Brand Quality Matters
- Aftermarket Brand Tiers for CL600 Crankshaft Sensor
- A Word of Caution on "White Box" Parts
- Known Issues, Recalls, and Service Bulletins
- Frequently Asked Questions (FAQ)
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