2009-2010 Hummer H3T Engine Crankshaft Position Sensor: A Complete Guide
If your H3T is stalling or won't start, the crankshaft position sensor is a likely suspect.
- A stalling engine that restarts after cooling is a classic sign of a failing crankshaft sensor.
- Choose a high-quality aftermarket brand like Delphi (OEM supplier), NGK/NTK, or Standard Ignition for reliability.
- A 'CASE relearn' procedure with a scan tool is required after replacement for proper function.
- The sensor location and replacement difficulty are very different between the 3.7L I5 and 5.3L V8 engines.
Is Your Hummer H3T Stalling? Check This Sensor First
Hummer H3T owners know their trucks are tough, but even the toughest machines have small parts that can cause big problems. If you're experiencing sudden engine stalls, trouble starting, or a new check engine light, the crankshaft position sensor could be the culprit. This sensor is vital for engine timing, and when it fails, it can bring your truck to a standstill. This guide will walk you through the symptoms, how to choose the right aftermarket replacement, and what to expect for the repair.
Symptoms of a Failing Crankshaft Position Sensor
A bad crankshaft sensor usually gives clear warnings. The most common issue is the engine stalling, especially after it has warmed up. You might be driving normally, and the engine just cuts out. Often, it will restart after cooling down for a bit. Other signs include:
- Check Engine Light: A failing sensor will almost always trigger the check engine light. The most common code is P0335 (Crankshaft Position Sensor "A" Circuit Malfunction).
- Engine Won't Start: The engine may crank but refuse to start because the computer doesn't know when to send spark and fuel.
- Rough Idling and Misfires: Your truck may idle poorly or feel like it's shaking due to incorrect timing.
- Poor Acceleration: You might notice a loss of power or hesitation when you press the gas pedal.
Engine Differences Matter
Your 2009-2010 H3T came with two possible engines: the 3.7L 5-cylinder or the 5.3L V8. The location of the crankshaft sensor is different for each. For the 3.7L, it's on the driver's side of the engine block, accessible through the wheel well. For the 5.3L V8, it's located at the rear of the engine block, near the starter, which is harder to reach.
Choosing the Right Aftermarket Sensor
With a critical sensor like this, quality matters. A cheap, poorly made sensor can fail quickly, leaving you stranded again. Here’s a breakdown of the brands available:
- OEM Supplier (Best Bet): Delphi is a well-known original equipment manufacturer for General Motors. Choosing a Delphi sensor is the closest you can get to OEM quality without the OEM price tag. This is a highly recommended option for reliability.
- High-Quality Aftermarket: Brands like NGK (NTK), Hitachi, and Standard Ignition (Standard Motor Products) have a strong reputation for producing reliable sensors that meet or exceed OEM specifications. Beck Arnley is also a trusted brand that often sources parts from the original manufacturers.
- Budget-Friendly Options: Brands like Dorman, Walker, and other store brands offer a lower price point. While tempting, be aware that the quality can be inconsistent for electronic parts. For a part that can leave you stranded, spending a little more on a top-tier brand is a smart investment.
Pro Tip: Before you replace the sensor, check the electrical connector first. A loose or corroded connector can mimic the symptoms of a failed sensor. One H3T owner fixed a P0335 code on their 5.3L V8 just by wiggling the plug and re-tightening the sensor bolt.
Cost to Replace the Hummer H3T Crankshaft Position Sensor
The cost will vary depending on the part quality and whether you do the job yourself. The 3.7L engine is a fairly simple DIY job, while the 5.3L V8 is more difficult due to the sensor's location.
| Item | Estimated Cost |
|---|---|
| New OEM (ACDelco) | $65 - $95 |
| New Aftermarket | $29 - $58 |
| Shop Labor | $100 - $250 |
| Total Professional Replacement | $130 - $345 |
Frequently Asked Questions
Do I need to perform a 'relearn' after replacing the sensor?
Yes. After replacing the crankshaft position sensor on a Hummer H3T, a "Crankshaft Position Variation Learn" (also called a CASE relearn) is required. This procedure uses a compatible scan tool to calibrate the new sensor to your engine's computer. Without this step, you may still have a check engine light or performance issues.
Where is the crankshaft position sensor located?
It depends on your engine. On the 3.7L I5, it is on the driver's side of the engine, and you can access it by removing the driver's side front wheel. On the 5.3L V8, it is at the rear of the engine block near the starter, making it more difficult to access.
Are there any recalls for this part?
No. While there are recalls for the 2009-2010 Hummer H3T for issues with the hood louver and HVAC system, there are no specific recalls for the crankshaft position sensor. Failures are considered normal wear and tear.
Can I use a sensor from a Chevy Colorado?
Yes, most likely. The Hummer H3T shares its platform and engines with the Chevrolet Colorado and GMC Canyon. Parts like the crankshaft position sensor are often identical. Always verify the part number fits your specific year and engine before purchasing.
Technical Specifications
OEM Part Numbers: 12592515 (for 3.7L) 12560228 (for 5.3L)
A 3-pin magnetic sensor that reads a reluctor wheel on the crankshaft to determine engine speed and position.
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.
- Hummer H3T: