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Chevrolet Cavalier Crankshaft Position Sensor Guide (1997-2006)

Solve your Cavalier's stalling, no-start, or rough running issues by understanding this critical engine sensor.

4 minutes to read 1997-2006 Chevrolet Cavalier
Difficulty
3/5
Est. Time
1.5 hrs
DIY Doable?
✅ Yes
Shop Labor
$120-$240
🚫 Do not drive — The risk of the engine stalling in traffic is high, which can cause a crash.
Key Takeaways
  • A failing crankshaft sensor is a very common cause of no-start, stalling, and rough running on the 1997-2006 Cavalier.
  • For critical sensors, choosing an OEM brand like ACDelco or Delphi is highly recommended to avoid premature failure and ensure correct signals.
  • Replacement is difficult due to tight access; on most models, the starter motor must be removed to reach the sensor.
  • After replacement, a 'crankshaft variation relearn' procedure with a scan tool may be necessary to prevent a check engine light.
The engine crankshaft position sensor is a small but vital part for your Chevrolet Cavalier's engine. It constantly watches the exact position and speed of the crankshaft. This information is sent to the engine's main computer, the ECM. The computer uses these signals to perfectly time when to inject fuel and when to fire the spark plugs. Without a good signal from this sensor, your engine can't run correctly and may not even start.

Is Your Cavalier Stalling or Not Starting? It Could Be the Crankshaft Sensor.

A comparison showing a clean, new crankshaft position sensor versus a failed sensor covered in oil and metal debris.
A healthy sensor (left) has a clean magnetic tip and intact O-ring, while a failing sensor (right) often shows signs of oil contamination or physical damage that disrupts the signal.
The engine block area of a Chevrolet Cavalier showing the location of the crankshaft sensor behind the starter motor.
Accessing the crankshaft sensor on most Cavalier engines, especially the 2.2L Ecotec, requires removing the starter motor to reach the sensor mounted on the engine block.
A new ACDelco or Delphi crankshaft position sensor in its retail packaging.
Choosing premium brands like ACDelco or Delphi ensures the sensor meets original GM specifications for timing accuracy and fitment.

If your 1997-2006 Chevrolet Cavalier suddenly stalls, has trouble starting, or runs rough, a bad crankshaft position sensor is a common cause. This sensor is the master clock for your engine's computer. When it fails, it can't tell the computer the crankshaft's position, leading to a host of drivability problems. Replacing it can often solve these issues and restore your engine's performance.

Symptoms of a Failing Crankshaft Sensor in a Cavalier

A bad crankshaft sensor usually doesn't fail silently. Your car will let you know something is wrong. Look out for these common signs:

  • Check Engine Light: This is often the first warning. You will likely get a diagnostic trouble code like P0335 or P0336.
  • Engine Won't Start: The engine will turn over (crank) but won't fire up because the computer doesn't know when to send spark and fuel.
  • Sudden Stalling: The engine may cut out for no reason while driving, especially at lower speeds. It might start back up after it cools down.
  • Rough Idle and Misfires: Your engine may shake or vibrate when stopped at a light. Incorrect timing can cause the engine to misfire.
  • Poor Acceleration: The car may feel weak or hesitate when you press the gas pedal.
  • Worse Gas Mileage: When engine timing is off, fuel isn't burned efficiently, leading to more trips to the gas station.

Choosing the Right Aftermarket Sensor: Brand Quality Matters

When it comes to critical electronics like a crankshaft sensor, brand quality can make a big difference. Sticking to a proven brand can save you from doing the job twice.

Brand Tier Brands Why Choose?
Premium / OEM ACDelco, Delphi Delphi was often the original equipment manufacturer (OEM) for GM, and ACDelco is GM's official parts brand. For reliability and perfect fit, these are the top choices. They are designed to match the original factory part's performance exactly.
Quality Aftermarket NGK (NTK), Hitachi, Standard Ignition (SMP), Walker Products These are well-respected brands known for making reliable sensors. They offer a great balance of quality and price, often meeting or exceeding OEM specifications without the OEM price tag.
Economy / Budget Dorman, Facet, Prenco, and other value brands These brands offer the most affordable options. While Dorman provides a wide range of parts, forum discussions show mixed reviews on sensor reliability. These are best if budget is the primary concern, but be aware of a higher potential for issues compared to premium brands.

A Note on "Relearn" Procedures

After replacing the crankshaft sensor, your Cavalier may require a "crankshaft position variation relearn" procedure. This calibrates the new sensor to the engine computer. Some owners report the car runs poorly or the check engine light stays on until this is done. This procedure requires a professional-grade scan tool and is best performed by a mechanic.

🎬 Watch a professional demonstrate the crankshaft variation relearn procedure.

Installation Overview

Replacing the sensor is possible for a skilled DIYer, but access is tight. The location depends on your engine:

  • 2.2L OHV (approx. 1997-2002): Located on the back of the engine block, below the intake manifold.
  • 2.4L Twin Cam (approx. 1997-2002): Found near the oil filter. Access often requires removing the starter motor.
    • 🎬 See how to access the sensor on 2.4L engines.
  • 2.2L Ecotec (approx. 2002-2006): Located behind the starter motor. You must remove the starter to access and replace the sensor.

The job typically involves disconnecting the battery, raising the vehicle safely, removing the starter (on most models), unplugging the old sensor, removing a single 10mm bolt, and then installing the new sensor.

Pro Tip: Before installing the new sensor, make sure the old O-ring came out with the old sensor. Lubricate the new O-ring with a small amount of clean engine oil to ensure a good seal and prevent leaks.

Frequently Asked Questions (FAQ)

Where is the crankshaft sensor located on my Cavalier?

For 2.2L Ecotec engines (2002-2006), it's behind the starter motor on the back of the engine. For earlier 2.2L and 2.4L engines, it is also on the engine block, but the exact position varies from being under the intake manifold to near the oil filter.

Can I replace this sensor myself?

Yes, if you have moderate mechanical skills and the right tools, including a jack and jack stands. The main challenge is the tight access, which usually requires removing the starter. The job can take 1-2 hours.

What happens if I don't replace a bad crankshaft sensor?

Your car will become increasingly unreliable. It will continue to stall, have trouble starting, and run poorly. Eventually, a complete sensor failure can leave you stranded because the engine will not start at all.

My check engine light is still on with code P0336 after replacing the sensor. What's wrong?

There is a Technical Service Bulletin (TSB 17-NA-156) for some GM vehicles that states the fix for a P0336 code may not be a new sensor, but an engine computer (ECM) software update. This update helps the computer better filter out electrical noise that can cause a false code. You may also need to perform the crankshaft variation relearn procedure.

2.2 Ecotec Cavalier Crank Position Sensor Replacement
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2.2 Ecotec Cavalier Crank Position Sensor Replacement
Crank No Start: How to find, remove and install the crankshaft position sensor on a GM 2.4L
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Crank No Start: How to find, remove and install the crankshaft position sensor on a GM 2.4L
How To: Crankshaft Position Variation Learn - Chevy/GMC Colorado/Canyon
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How To: Crankshaft Position Variation Learn - Chevy/GMC Colorado/Canyon
How-To: Crankshaft Variation Learn Procedure (Tech2)
▶
How-To: Crankshaft Variation Learn Procedure (Tech2)

Technical Specifications

OEM Part Numbers: 12577245 24575514 12567649

Typically a 2-pin or 3-pin magnetic or Hall-effect sensor that mounts to the engine block.

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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.

Year Coverage
This article covers the Engine Crankshaft Position Sensor for:
  • Chevrolet Cavalier: 1997199819992000200120022003200420052006
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