Mercedes-Benz Sprinter 3500 Crankshaft Position Sensor: A 2010-2024 Guide
Don't let a failing crankshaft sensor leave your Sprinter 3500 stranded; here's what you need to know.
- A failing sensor often causes engine stalling when hot, which is a major safety hazard.
- Replacement is difficult due to the sensor's location and high chance of it seizing in the engine block.
- Avoid the cheapest aftermarket parts; use an OEM or a top-tier OE-supplier brand like Hella or Delphi for reliability.
- Confirm the exact part number with your VIN before ordering, as it varies by engine type and year.
Is Your Sprinter 3500 Stalling? It Could Be the Crankshaft Sensor
A common and serious problem with the Mercedes-Benz Sprinter 3500 is a failing crankshaft position sensor. This small electronic part plays a huge role in how your engine runs. When it starts to go bad, it can cause your engine to stall without warning, which is a major safety risk. A very common symptom is the engine stalling when it gets hot, then refusing to restart until it has cooled down for a while. This guide will help you understand the symptoms, choose the right aftermarket replacement, and know what to expect for the repair.
Symptoms of a Failing Crankshaft Position Sensor
Watch for these signs. If you experience stalling, it's important to get the vehicle inspected right away.
- Engine Stalling, Especially When Hot: The most reported issue is the engine cutting out while driving. It often won't restart until the engine has cooled.
- Engine Won't Start: The engine will crank over, but it won't fire up because the computer isn't getting the signal it needs to start ignition.
- Check Engine Light: A failing sensor will almost always trigger the check engine light. Common trouble codes are P0335 and P0336.
- Rough Performance: You might notice rough idling, engine misfires, poor acceleration, and worse fuel mileage.
- No RPM Reading: When trying to start the engine, a scanner might show 0 RPM, which points directly to a bad sensor signal.
Recalls and Technical Service Bulletins (TSBs)
While no active recalls exist for this specific part across the entire 2010-2024 range, an earlier recall for the OM642 diesel engine (used in Sprinters up to 2018) addressed crankshaft sensors that could fail and cause stalling. Mercedes-Benz has also issued technical service bulletins (TSBs) for diagnosing fault codes P0335 and P0336 related to this sensor, showing it is a known issue.
Choosing the Right Aftermarket Sensor
For a critical part like this, quality matters. A cheap sensor can fail quickly, leaving you stranded again. Forum members and mechanics strongly advise against using budget brands for this specific part on a Sprinter. It's better to spend a little more on a quality part to ensure reliability.
Here’s a breakdown of brand quality tiers:
- Top Tier (Recommended): These are often original equipment (OE) suppliers for Mercedes-Benz. Brands like Hella, Delphi, and Vemo have a strong reputation for European vehicles. Choosing one of these is the safest bet for a long-lasting repair.
- Mid-Grade: Brands like NGK, Spectra, Standard Ignition (SMP), and Walker Products are established aftermarket names. They can be a good balance of price and quality, but their performance can be inconsistent compared to top-tier brands.
- Economy Tier: This includes brands like Dorman and other lower-priced options. While the price is tempting, the risk of premature failure is higher. For a part that can cause your engine to stall completely, saving a few dollars here is generally not worth the risk.
A Mechanic's Advice
Always check the part number before ordering. Due to different engines (like the OM642 V6 diesel, OM651 4-cylinder diesel, and newer gasoline engines) used from 2010 to 2024, the exact sensor can vary. Using your vehicle's VIN to confirm fitment is the best way to avoid ordering the wrong part.
Replacement Cost
The cost can vary a lot based on whether the old sensor comes out easily. It is held in by one bolt but can seize in the engine block.
| Item | Estimated Cost |
|---|---|
| New Aftermarket Part | $25 - $110 |
| Shop Labor | $80 - $180 (can be much higher if the sensor breaks during removal) |
| Total Estimated Cost | $105 - $290+ |
Frequently Asked Questions
Where is the crankshaft position sensor located on the Sprinter 3500?
On many NCV3 (approx. 2007-2018) and VS30 (2019+) models with V6 or 4-cylinder engines, the sensor is on the driver's side of the vehicle, at the back of the engine where it meets the transmission. It is located just above the starter motor. It is in a very tight space and difficult to see and reach from underneath the van.
Can I replace this part myself?
This is a challenging DIY job. While it's only held by one E8 Torx bolt, the sensor is notorious for getting stuck (seized) in the engine block. If it breaks during removal, the transmission may need to be removed to get the broken pieces out, turning a small job into a massive one. If you are not an experienced DIY mechanic, this job is best left to a professional.
What happens if the sensor breaks during removal?
If the sensor breaks off flush with the engine block, it becomes extremely difficult to remove. Some owners have had to remove the transmission and flexplate to punch the broken sensor out from the inside. This dramatically increases labor time and cost. Applying penetrating oil before attempting removal and wiggling it gently can help, but success is not guaranteed.
Should I buy an OEM or Aftermarket sensor?
While this guide focuses on aftermarket parts, for this specific sensor, the consensus is strong: use a high-quality part. A cheap aftermarket sensor is known to fail out of the box or shortly after installation. To avoid doing the job twice or being stranded, it is highly recommended to use an OEM part or a top-tier aftermarket brand that is an OE supplier, like Hella or Delphi.
Technical Specifications
OEM Part Numbers: 6429050000 0031539728 2709050600 6421530728
Typically a 3-pin Hall effect sensor that reads the crankshaft's rotational speed and position. It is mounted on the engine block near the transmission bell housing, above the starter motor. The retaining bolt is commonly an E8 external Torx.
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 Sprinter 3500: