Imagine yourself driving your 2010 Chevrolet Cobalt on a beautiful summer day. Suddenly, the engine starts to sputter and the check engine light illuminates. You pull over and check your OBD2 scanner, only to find the dreaded code P0336: “Crankshaft Position Sensor A Circuit Malfunction.” What does this mean? How do you fix it? Don’t worry, we’re here to help you understand the situation and get your car back on the road.
What Does OBD Code P0336 Mean?
The crankshaft position sensor (CKP sensor) is a crucial component in your car’s ignition system. Its job is to tell the engine control module (ECM) the position of the crankshaft, which helps determine the timing of the spark plugs and fuel injection. Code P0336 indicates that the ECM has detected a problem with the CKP sensor’s electrical circuit. This could be due to several factors, including:
A Faulty CKP Sensor
The sensor itself could be malfunctioning, meaning it’s not accurately reporting the position of the crankshaft. This could be caused by a damaged wiring harness, a faulty internal component, or even corrosion.
A Bad Connection
A loose connection in the wiring harness can also cause the CKP sensor to malfunction.
Open or Short Circuit
Issues with the sensor’s wiring can cause an open circuit (break in the wiring), a short circuit (unintended contact between wires), or even damage to the ECM itself.
How to Fix a 2010 Chevrolet Cobalt OBD Code P0336
Before diving into the repair process, it’s important to understand that this code doesn’t necessarily mean your CKP sensor is broken. You’ll need to perform a few diagnostics first.
Inspect the CKP Sensor and Wiring Harness
- Locate the CKP sensor: Start by locating the CKP sensor. It’s typically located near the crankshaft pulley on the front of the engine. Consult your Chevrolet Cobalt’s owner’s manual or a reliable online repair guide for the specific location.
- Check the wiring harness: Visually inspect the wiring harness leading to the sensor for any signs of damage, wear, or corrosion. Look for broken wires, loose connections, or any indication of melted insulation.
- Test the CKP sensor: If the wiring harness looks good, use a multimeter to test the sensor’s resistance and voltage. These readings should fall within the manufacturer’s specifications.
Replace the CKP Sensor
If your inspection and testing reveal a faulty sensor or wiring harness, you’ll need to replace the CKP sensor. Here’s a general guide:
- Disconnect the battery: This is crucial for safety purposes, as working with electrical components can be dangerous.
- Remove the old sensor: Using the appropriate socket and wrench, carefully detach the CKP sensor from its mounting bracket.
- Install the new sensor: Install the new sensor in the same location as the old one, ensuring it’s securely attached.
- Reconnect the battery: Once the new sensor is installed, you can reconnect the battery.
Clear the Code and Test Drive
After replacing the sensor or fixing the wiring harness, clear the OBD code using your scanner. Then, start the car and test drive it to see if the problem is resolved. If the check engine light comes back on or the engine continues to run poorly, you may need to consult a professional mechanic.
Other Considerations
Remember, these steps are just a general guideline. Always consult your Chevrolet Cobalt’s repair manual for specific instructions and safety precautions.
It’s also essential to note that while code P0336 usually points to the CKP sensor, there are other possible causes, including:
- Faulty ECM: A faulty ECM can also trigger code P0336.
- Interference with the sensor: External factors, such as electromagnetic interference or a nearby mechanical part vibrating against the sensor, can cause malfunctions.
Other Frequently Asked Questions about 2010 Chevrolet Cobalt OBD Code P0336
Q: Can I drive my car with this code?
A: It’s generally not advisable to continue driving with this code. Code P0336 usually points to a problem with your ignition system, which can lead to engine misfires and other issues.
Q: How much does it cost to fix?
A: The cost of fixing code P0336 can vary depending on the cause, location, and labor rates. Replacing the CKP sensor itself can range from $50 to $100, while labor costs can range from $50 to $150.
Q: Is it DIY-friendly?
A: Replacing the CKP sensor is generally considered a DIY-friendly repair for those with basic mechanical skills. However, if you’re not comfortable working on your own car, it’s always best to consult a professional mechanic.
Q: Can I reset the code myself?
A: You can reset the code using an OBD2 scanner, but it’s important to remember that the code will return if the underlying problem isn’t addressed.
Q: Can I use a generic CKP sensor?
A: While some generic sensors may work, it’s always recommended to use a sensor specifically designed for your 2010 Chevrolet Cobalt. Using an incompatible sensor could lead to further complications.
Q: What are some common symptoms of a faulty CKP sensor?
A: Aside from the check engine light, other symptoms include:
- Engine misfires: The engine may run roughly or misfire.
- Reduced power: You may notice a loss of engine power.
- Difficult starting: The engine may be difficult to start.
- Rough idling: The engine may idle unevenly.
- Stalling: The engine may stall, particularly at low speeds.
Q: What is the best way to prevent this issue from happening again?
A: Regular maintenance and proper care can help prevent future issues.
- Maintain your ignition system: Perform regular tune-ups and replace worn-out spark plugs, ignition wires, and other components.
- Inspect the CKP sensor regularly: Visually inspect the sensor and its wiring harness for any signs of damage or corrosion.
- Keep your car’s electrical system clean: Clean the battery terminals and electrical connectors regularly to prevent corrosion.
Need More Help?
If you’re still experiencing issues with code P0336 or need further assistance with your 2010 Chevrolet Cobalt, don’t hesitate to reach out! We have experienced technicians available 24/7 to assist you.
**[shortcode-1]ckp-sensor-location|Crankshaft Position Sensor Location|A close-up image of a crankshaft position sensor on a Chevrolet Cobalt engine, with the sensor highlighted in red. The image should also show the surrounding components, such as the crankshaft pulley and wiring harness.</shortcode-1]**
**[shortcode-2]obd-scanner-use|OBD2 Scanner Use|A close-up image of a mechanic using an OBD2 scanner to diagnose a problem on a Chevrolet Cobalt. The image should show the scanner plugged into the vehicle’s diagnostic port and the mechanic reading the diagnostic code on the scanner’s screen.</shortcode-2]**
**[shortcode-3]chevrolet-cobalt-repair|2010 Chevrolet Cobalt Repair|A mechanic working on a 2010 Chevrolet Cobalt, specifically focusing on the engine compartment. The image should highlight tools and equipment typically used to repair a crankshaft position sensor, such as a wrench, a socket, and a multimeter.</shortcode-3]**