Cadillac STS (2005-2011) Crankshaft Position Sensor: Symptoms, Brands, and Replacement
If your Cadillac STS is stalling, misfiring, or won't start, the crankshaft position sensor could be the problem.
- Primary symptoms of failure are engine stalling, a crank-no-start condition, and a check engine light with code P0335.
- For 3.6L V6 models, investigate TSB PIP3423 for a possible slipped reluctor wheel or timing chain issue before replacing the sensor.
- Replacement is significantly more difficult on the 4.6L V8 Northstar engine than on the 3.6L V6 due to sensor location.
- A 'crankshaft variation learn' procedure with a scan tool is recommended after installation for optimal performance.
Is Your Cadillac STS Stalling or Not Starting?
A faulty crankshaft position sensor is a common reason for a Cadillac STS to develop serious running problems. When this sensor starts to fail, it can leave you stranded. The most severe symptoms are a crank-no-start condition, where the engine turns over but never fires up, or sudden engine stalling while driving, which is a major safety hazard. You may also notice a check engine light on your dashboard, a rough idle, engine misfires, and poor acceleration.
Critical Issue for 3.6L V6 Owners: Check for TSB PIP3423
Before you replace the crankshaft sensor on a V6 model, be aware of Technical Service Bulletin (TSB) PIP3423. This bulletin notes that stretched timing chains or a slipped crankshaft reluctor wheel can cause trouble codes like P0008, P0009, P0016, and P0017. These issues mimic the symptoms of a bad crank sensor but are a much more serious engine repair. A mechanic can inspect the reluctor wheel's position through the sensor hole to rule this out before you spend money on a sensor you may not need.
Choosing the Right Aftermarket Crankshaft Sensor
When shopping for a new aftermarket sensor, you'll find a wide range of brands and prices. They generally fall into three tiers:
- Premium Aftermarket (OEM-Tier): Brands like ACDelco, Delphi, Bosch, and NGK (NTK) are often the original equipment manufacturers for GM. Choosing one of these brands gives you the highest confidence in fit, performance, and longevity, closely matching the original part.
- Quality Aftermarket: Brands such as Standard Ignition (SMP), Walker Products, and Beck Arnley offer a solid balance of quality and value. They are well-regarded in the industry and are a reliable choice for most repairs.
- Economy Brands: Parts from Dorman, Holstein, and other budget-friendly brands can get your vehicle back on the road for a lower initial cost. While they meet basic function requirements, their long-term durability can sometimes be less consistent than premium options.
Pro Tip: Replacement Varies by Engine
The replacement difficulty is very different for the V6 and V8 engines.
For the 3.6L V6, the sensor is on the passenger side of the engine block, near where the engine meets the transmission. It is located below the exhaust manifold and is protected by a small heat shield that must be pried off for access. The job is typically done from underneath the vehicle.
🎬 Watch this step-by-step replacement guide for the 3.6L V6 engine.For the 4.6L V8 Northstar, the job is more difficult. The Northstar engine in this generation may use two crankshaft position sensors, located behind the oil filter adapter housing. This requires removing the oil filter and its housing to gain access, making it a more time-consuming and messy job.
🎬 See how to access the sensors on the 4.6L Northstar V8.Cost to Replace a Cadillac STS Crankshaft Position Sensor
| Part Type | Estimated Cost |
|---|---|
| New Aftermarket Sensor | $20 - $156 |
| New OEM (Dealer) Sensor | $100 - $200 |
| Shop Labor | $120 - $250 |
Frequently Asked Questions (FAQ)
Where is the crankshaft position sensor located on the STS?
On the 3.6L V6, it's on the lower passenger side of the engine near the transmission bell housing. On the 4.6L V8, there are two sensors located behind the oil filter housing.
Do I need to perform a "relearn" procedure after replacement?
Yes, a "Crankshaft Position System Variation Learn Procedure" is recommended after replacing the sensor. This procedure uses a diagnostic scan tool to calibrate the new sensor to the engine's computer for accurate timing. While the car may run without it, skipping this step can cause a check engine light or subtle performance issues.
🎬 Watch a demonstration of the crankshaft sensor relearn procedure.Can I drive my STS with a bad crankshaft sensor?
It is not recommended. The risk of the engine stalling at any time, including at high speeds or in traffic, makes the vehicle unsafe to drive.
Could my problem be something other than the sensor?
Absolutely. For the 3.6L V6, the issue could be a slipped reluctor wheel or stretched timing chains, as noted in TSB PIP3423. Damaged wiring or a bad connector can also cause the same symptoms. Always diagnose the problem thoroughly before replacing parts.
Helpful Videos
Technical Specifications
OEM Part Numbers: 12580429 213-3515
The specific part and replacement procedure differ between the 3.6L V6 and 4.6L V8 Northstar engines. The V8 may use two sensors. A crankshaft variation relearn procedure is required after installation for proper calibration.
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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.
- Cadillac STS:
- 🎬 Helpful Videos
- 🛍️ Shop This Part
- Is Your Cadillac STS Stalling or Not Starting?
- Critical Issue for 3.6L V6 Owners: Check for TSB PIP3423
- Choosing the Right Aftermarket Crankshaft Sensor
- Pro Tip: Replacement Varies by Engine
- Cost to Replace a Cadillac STS Crankshaft Position Sensor
- Frequently Asked Questions (FAQ)
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