Infiniti QX56 (2004-2013) Engine Crankshaft Position Sensor Guide
Understanding why your QX56 is stalling or won't start and how to choose the right crankshaft sensor to fix it.
- A failing crankshaft sensor is a very common cause of no-start and stalling issues in the 2004-2013 QX56, often triggering code P0335.
- For best results, use an OEM sensor or a sensor from the OEM supplier, Hitachi. Cheaper aftermarket sensors are known to be unreliable for this specific application.
- The sensor is different for the 2004-2010 and 2011-2013 generations; ensure you buy the correct part for your year.
- Replacement is a simple, DIY-friendly job that requires basic tools and can be completed in under an hour.
Understanding the QX56 Crankshaft Sensor
If your 2004-2013 Infiniti QX56 is experiencing issues like stalling, difficulty starting, or a noticeable drop in engine power, a failing crankshaft position sensor is a likely culprit. This sensor is essential for modern engine management, and when it fails, it can leave you stranded. This guide will walk you through the symptoms, brand choices, and replacement considerations for your specific QX56.
Generation-Specific Parts
The 2004-2013 QX56 covers two different vehicle generations. The first generation (2004-2010) uses the VK56DE engine, while the second generation (2011-2013) has the VK56VD engine. These engines use different crankshaft position sensors. It is crucial to verify the part fits your specific model year before purchasing.
Symptoms of a Failing Crankshaft Sensor
A bad crankshaft sensor can cause a range of problems, from annoying to severe. Here are the most common signs:
- No-Start Condition: The engine will turn over (crank) but will not fire up. This is one of the most definitive symptoms.
- Engine Stalling: The engine may stall unexpectedly while driving, often after it has warmed up. It may or may not restart right away.
- Check Engine Light: A failing sensor will almost always trigger a Check Engine Light. The most common trouble code associated with this failure is P0335 (Crankshaft Position Sensor 'A' Circuit Malfunction).
- Rough Idle and Misfires: The engine may run poorly, shake at idle, or hesitate during acceleration because the computer cannot time the spark and fuel correctly.
- Reduced Engine Power: Your QX56 may feel sluggish and lack its usual power. 🎬 Learn more about P0335 drivability concerns and no-start situations.
Choosing the Right Aftermarket Sensor
When it comes to critical electronic sensors on Nissan and Infiniti vehicles, quality matters immensely. Many owners and technicians report issues with cheap, unbranded aftermarket sensors failing quickly or not working at all.
Brand Tiers for Your QX56
- OEM Supplier (Hitachi): Hitachi is widely reported to be the Original Equipment Manufacturer (OEM) for these sensors. Choosing a Hitachi-branded sensor is the closest you can get to a genuine Infiniti part without the dealership price tag. They are highly recommended for reliability.
- Premium Aftermarket (Delphi, NGK/NTK, Standard Ignition): Brands like Delphi, NGK (NTK), and Standard Motor Products are well-regarded in the industry. They design their sensors to meet or exceed OE specifications and are a solid choice if Hitachi is unavailable.
- Standard Aftermarket (Beck Arnley, Walker, Holstein): These brands can offer good value. They are generally more reliable than the cheapest options but may not have the same long-term durability as premium brands for this specific, sensitive application.
A Note on Camshaft vs. Crankshaft Sensors
Your QX56 also has camshaft position sensors, which look very similar and often fail around the same time. Many owners choose to replace the crankshaft and both camshaft sensors at the same time to avoid future issues. However, be aware they are different parts; the P0335 code specifically points to the crankshaft sensor.
Cost of Replacement
The cost to replace the crankshaft position sensor varies depending on the part brand and labor rates. It is a relatively accessible part, making DIY replacement feasible for many owners.
| Item | Estimated Cost |
|---|---|
| New OEM Sensor | $110 - $175 |
| New Aftermarket Sensor | $26 - $105 |
| Shop Labor | $55 - $80 |
| Total (Shop Repair) | $170 - $250 |
Frequently Asked Questions
Where is the crankshaft sensor located on the QX56?
On the 5.6L V8 engine used in both generations (VK56DE and VK56VD), the crankshaft position sensor is located on the transmission bell housing, near the bottom where the engine and transmission meet. It is held in by a single 10mm bolt.
Was there a recall for the QX56 crankshaft sensor?
Yes, there was a recall (NHTSA Campaign ID 03V455000) for early model year Infiniti vehicles, including the QX56, for improper solder joints on the circuit boards for the crank and cam sensors. This recall would have been performed years ago, but it highlights the known sensitivity of these parts. There was also a separate, later service campaign for timing chain issues on 2011-2013 models that could indirectly relate to crank signals but was not for the sensor itself.
Can I replace this sensor myself?
Yes, this is a very DIY-friendly repair for most people with basic tools. The sensor is typically accessed from underneath the vehicle. It involves disconnecting the electrical connector, removing one 10mm bolt, and swapping the old sensor for the new one. 🎬 Watch a step-by-step QX56 crankshaft sensor replacement guide. The job usually takes less than an hour.
Do I need to perform an ECU relearn procedure after replacement?
While not always strictly necessary, it is a good practice to clear the trouble codes with a scan tool after replacement. Some owners and technicians recommend an ECU relearn procedure to ensure the system adapts to the new sensor immediately, but often the car will run fine and adapt on its own after a few drive cycles.
What if I replace the sensor and the P0335 code comes back?
If the code returns, especially after using a quality sensor, the issue may be more complex. The problem could be a damaged reluctor ring (the teeth on the flywheel that the sensor reads), damaged wiring or connector, or in rare cases, an issue with the ECM. 🎬 See how to diagnose and fix persistent QX56 crank codes. A damaged reluctor ring can happen during transmission or engine work.
Helpful Videos
Technical Specifications
OEM Part Numbers: 23731-AL61A 23731-AL616 23731-1CA0B 23731-JA10C
The sensor for the QX56 is a Hall Effect type sensor that reads the teeth on the engine's flexplate (flywheel) to determine crankshaft speed and position. It uses a 3-pin electrical connector.
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.
- INFINITI QX56:
- 🎬 Helpful Videos
- 🛍️ Shop This Part
- Understanding the QX56 Crankshaft Sensor
- Generation-Specific Parts
- Symptoms of a Failing Crankshaft Sensor
- Choosing the Right Aftermarket Sensor
- Brand Tiers for Your QX56
- A Note on Camshaft vs. Crankshaft Sensors
- Cost of Replacement
- Frequently Asked Questions
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