Chevrolet Silverado 2500 (1999-2004) Camshaft Position Sensor Guide
Fixing stalling, rough idle, and no-start problems on your Silverado 2500 often starts with this critical engine sensor.
- A failing sensor commonly causes stalling, a no-start condition, or a Check Engine Light with codes P0340-P0343.
- The sensor is located at the back of the engine, making replacement difficult and labor-intensive.
- For reliability, choose a high-quality aftermarket brand like Delphi, which is often the OEM supplier, or a reputable brand like Standard Ignition or NGK.
- Driving with a bad sensor is not recommended due to the risk of the engine stalling in traffic.
Is Your Truck Trying to Tell You Something?
A failing camshaft position sensor (CMP) in a 1999-2004 Chevrolet Silverado 2500 can cause frustrating and sometimes dangerous problems. Because this sensor is vital for engine timing, its failure can make your truck run poorly or not at all. Ignoring the symptoms can lead to a vehicle that won't start or stalls in traffic.
Common Symptoms of a Failing Camshaft Sensor
Your truck's computer is smart enough to detect a problem with the sensor's signal, which will almost always trigger the Check Engine Light. Beyond that, watch for these common signs:
🎬 Watch this video to see these common symptoms in action.- Check Engine Light: This is the most common symptom. A code reader will typically show codes like P0340, P0341, P0342, or P0343. 🎬 Learn how to fix a P0342 camshaft circuit low code.
- Engine Won't Start: The engine may crank but fail to fire up. This happens because the computer isn't getting the signal it needs to time the spark and fuel delivery.
- Stalling and Rough Idle: The engine may run erratically, shake at a stop, or shut off unexpectedly, even while driving. This is a major safety concern.
- Poor Acceleration and Power Loss: You might notice a significant lack of power, hesitation, or stumbling when you press the gas pedal.
- Reduced Fuel Economy: When the engine's timing is off, it runs inefficiently, causing you to use more fuel.
A Note on Replacement Difficulty
On the V8 engines (like the 6.0L) in these Silverado 2500 trucks, the camshaft position sensor is located at the very back of the engine block, tucked behind the intake manifold. This makes it a difficult part to access. While some experienced mechanics can replace it without removing the intake manifold, many find it necessary to do so, which adds significant time and complexity to the job. This is not a quick and easy part to swap if it fails prematurely.
Choosing the Right Aftermarket Sensor: Brand Quality Matters
For a part that is this difficult to replace, choosing a high-quality, reliable sensor is critical to avoid doing the job twice. While OEM ACDelco is always an option, several aftermarket brands offer excellent quality, sometimes from the same factory.
- Top Tier (OEM or Equivalent): Delphi is widely considered a top choice. They are often the original equipment manufacturer for GM, meaning the Delphi part can be identical to the ACDelco part it replaces. For critical sensors in hard-to-reach places, this is a highly recommended option.
- Reputable Aftermarket: Brands like Standard Ignition (SMP), NGK, and Hitachi have a strong reputation for producing quality electronic components that meet or exceed OE specifications.
- Economy Options: Brands like Dorman and other value-priced sensors are available. However, for a critical sensor that is labor-intensive to replace, many professional mechanics and experienced owners recommend avoiding the cheapest options, as they can have a higher failure rate out of the box or a shorter service life.
Pro Tip: Before replacing the sensor, always inspect the wiring connector and pigtail for signs of corrosion, damage, or oil contamination. A bad connection can mimic the symptoms of a failed sensor.
Cost of Replacing the Camshaft Position Sensor
| Item | Estimated Cost |
|---|---|
| New Aftermarket Part | $27 - $75 |
| New OEM (ACDelco) Part | $180 - $205 |
| Shop Labor | $85 - $125+ (can be higher if intake manifold is removed) |
| Total Professional Replacement | $268 - $330+ |
Frequently Asked Questions
Can I drive my Silverado with a bad camshaft position sensor?
It is not recommended. The most dangerous symptom is the engine stalling unexpectedly, which can happen at any speed and create a serious safety risk. It's best to get the vehicle repaired as soon as possible.
Where is the camshaft position sensor located on a 1999-2004 Silverado 2500?
For the V8 engines common in this truck (e.g., 6.0L Vortec), the sensor is located at the top rear of the engine block, behind the intake manifold. It is held in by a single 10mm bolt. Access is very tight.
🎬 See how to replace the sensor on your Chevy Silverado.Are there any recalls for this part?
No. There are no specific recalls or widespread Technical Service Bulletins (TSBs) from GM or the NHTSA for the camshaft position sensor on the 1999-2004 Chevrolet Silverado 2500.
Do I need to perform a 'relearn' procedure after replacing the sensor?
For the camshaft position sensor on this generation of Silverado, a specific relearn procedure is generally not required. After installing the new part, you should clear the Check Engine Light codes with a scan tool, and the truck's computer will adapt to the new sensor. A relearn is typically only needed if the crankshaft position sensor is also replaced.
What's the difference between a camshaft sensor and a crankshaft sensor?
They work together. The camshaft sensor tracks the position of the camshaft (which controls the valves), while the crankshaft sensor tracks the position of the crankshaft (which is connected to the pistons). The computer compares both signals to ensure the engine is perfectly timed. A bad crankshaft sensor often causes stalling when the engine gets hot, while a bad camshaft sensor is more known for causing a long crank time before the engine starts.
Helpful Videos
Technical Specifications
OEM Part Numbers: 12591720 213-1690
Hall Effect Sensor, 3-pin connector, located at rear of engine block for V8 models.
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.
- Chevrolet Silverado 2500:
- 🎬 Helpful Videos
- 🛍️ Shop This Part
- Is Your Truck Trying to Tell You Something?
- Common Symptoms of a Failing Camshaft Sensor
- A Note on Replacement Difficulty
- Choosing the Right Aftermarket Sensor: Brand Quality Matters
- Cost of Replacing the Camshaft Position Sensor
- Frequently Asked Questions
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