You’re not alone if your vehicle’s check engine light has suddenly come on – over 10 million vehicles in the US experience a faulty crankshaft position sensor every year. One common issue that can trigger this warning is a P0335 code, indicating a malfunction in the crankshaft position sensor ‘A’ circuit. But what exactly does this mean, and how can you fix it?
The crankshaft position sensor plays a crucial role in your engine’s performance, so it’s essential to address this issue promptly. As you investigate the potential causes and solutions, you’ll want to know what symptoms to look out for and how to diagnose the problem correctly.
Key Takeaways
- The P0335 code indicates a malfunction in the crankshaft position sensor A circuit, which can affect engine performance and potentially cause damage.
- A faulty crankshaft position sensor can cause misfiring, rough idling, stalling, and engine failure if left unaddressed.
- Common causes of the P0335 code include a faulty or damaged sensor, loose or corroded wiring connections, and issues with the engine control module.
- Engine misfires, stalling, decreased fuel efficiency, and an illuminated check engine light are symptoms of a faulty sensor.
- Diagnostic steps include sensor troubleshooting, wiring inspection, and analyzing sensor signal data to determine the root cause of the malfunction.
Code P0335 Description
When your vehicle’s onboard diagnostics system detects a malfunction in the circuit of the crankshaft position sensor A, it triggers the P0335 diagnostic trouble code (DTC).
This sensor plays a pivotal role in your engine’s performance. It detects the crankshaft’s position and sends essential information to the engine control module (ECM).
The ECM relies on this data for proper fuel injection timing, ignition timing, and overall engine performance.
A faulty sensor can lead to misfiring, rough idling, stalling, and engine failure.
As a critical component, the crankshaft position sensor’s function is imperative for maintaining peak engine performance and preventing potential damage.
Common Causes of Malfunction
Faulty or damaged crankshaft position sensors are a leading cause of P0335 trouble codes, often resulting from physical damage, wear and tear, or electrical issues.
You’ll need to perform sensor troubleshooting to identify the root cause. During your inspection, pay attention to loose or corroded wiring connections to the sensor, as these can also trigger the error code.
Additionally, issues with the engine control module (ECM) or related components, damaged reluctor ring on the crankshaft, and timing belt or chain issues affecting sensor alignment can also contribute to the malfunction.
Wiring inspection is vital to rule out electrical issues. Understanding these common causes will better equip you to diagnose and fix the problem.
Symptoms of a Faulty Sensor
As you turn the key in the ignition, your engine sputters to life, but something’s off.
You notice the engine misfires or runs rough, making it difficult to start. When you’re driving, the engine stalls or loses power intermittently, leaving you stranded.
You’ve also noticed a decrease in fuel efficiency, which is affecting your wallet. The check engine light is illuminated, indicating a problem with your crankshaft position sensor.
Sensor failure can cause these issues, and if left unchecked, can lead to more severe engine damage. Engine stalling is a common symptom of a faulty sensor, and it’s essential to address the problem promptly to avoid further complications.
Diagnostic and Repair Steps
Dive into the diagnostic process to identify the root cause of the P0335 code.
You’ll need to perform a thorough sensor troubleshooting to pinpoint the issue. Start by checking the crankshaft position sensor’s wiring and connections for damage or corrosion.
Next, use a scan tool to monitor the sensor’s signal and engine performance data. Analyze the data to determine if the sensor is sending erratic or no signals to the ECM.
This will help you identify if the sensor itself is faulty or if there’s an issue with the ECM or related components. By following these diagnostic steps, you’ll be able to isolate the problem and take the necessary repair steps to restore peak engine performance.
Inspecting the Crankshaft Sensor
Now that you’ve completed the diagnostic process and gathered data on the crankshaft position sensor’s signal, it’s time to visually inspect the sensor itself.
Make sure to locate the sensor, usually found near the crankshaft, and inspect it for any signs of damage or corrosion.
Check the sensor’s wiring harness for any signs of wear, fraying, or corrosion, as these can cause issues with the signal.
- Look for any signs of physical damage, such as cracks or dents, on the sensor’s housing.
- Check the sensor’s electrical connector for corrosion or loose connections.
- Perform a gentle cleaning of the sensor and its connector using a soft-bristled brush and a mild cleaning solution to remove any dirt or debris that may be affecting the signal.
Replacing the Crankshaft Position Sensor
Most crankshaft position sensors can be replaced without removing the engine, but it’s essential to consult your vehicle’s repair manual for specific instructions. When replacing the sensor, verify it’s properly aligned and connected to avoid any issues. Inspect the wiring harness for damage or corrosion and repair or replace it as needed.
| Sensor Replacement Steps | Important Considerations |
|---|---|
| Disconnect the battery | Prevents accidental engine start |
| Remove the sensor mounting bracket | Access to the sensor and wiring |
| Unplug the sensor electrical connector | Carefully pull the connector to avoid damage |
| Install the new sensor and reconnect | Certify proper alignment and secure connections |
Remember to clear the DTC and conduct a test drive to verify the issue has been resolved after replacing the crankshaft position sensor.
Associated Repair Costs and Fees
You’ll need to factor in the associated repair costs and fees when addressing a P0335 code, which can vary depending on the specific cause of the issue and the make and model of your vehicle.
The estimated costs you might incur are:
- Labor costs: $100 to $200, depending on the complexity of the repair and the mechanic’s rates
- Diagnostic fees: $50 to $150, which may be waived if you opt for the recommended repairs
- Replacement parts: $50 to $200 for a new crankshaft position sensor, depending on the quality and brand
Keep in mind that these are rough estimates, and your actual costs may be higher or lower.
It’s essential to get a detailed quote from your mechanic before proceeding with the repairs.
Important Diagnostic Notes
When addressing a P0335 code, accurate diagnosis is key to identifying the root cause of the issue.
You’ll want to pay close attention to Sensor Correlation, as it’s vital in determining whether the crankshaft position sensor A is malfunctioning.
During Cranking Intervals, the ECM relies on the sensor’s data to synchronize fuel injection and ignition timing.
If the sensor’s signal is weak or erratic, the engine may misfire, stall, or experience rough idling.
To verify accurate diagnosis, use a scan tool to monitor the sensor’s signal and correlation data.
This will help you identify if the issue lies with the sensor, wiring, or ECM.
Frequently Asked Questions
Can a Faulty Oxygen Sensor Trigger a P0335 Code?
You’re wondering if a faulty oxygen sensor can trigger a P0335 code, but it’s unlikely since the oxygen sensor doesn’t directly correlate with the crankshaft position sensor’s circuit malfunction, which is what the P0335 code indicates; a faulty oxygen sensor won’t typically trigger this specific code.
Is It Safe to Drive With a P0335 Code Illuminated?
As you drive, coincidentally, you’re taking a huge risk – engine stalling, misfires, and decreased fuel efficiency are just the beginning. Your car’s erratic behavior will only worsen, so don’t chance it; pull over and address the issue promptly to avoid further damage.
Can a Crankshaft Position Sensor Be Cleaned or Repaired?
You should avoid attempting to clean or repair a crankshaft position sensor, as it’s a sensitive component prone to electrical interference; instead, consider replacing it to guarantee peak performance and sensor maintenance.
Will a P0335 Code Cause My Car to Fail an Emissions Test?
You’ll likely fail an emissions test with a malfunctioning crankshaft position sensor, as it disrupts engine performance, leading to increased emissions. The sensor’s faulty signal causes misfires, rough idling, and decreased fuel efficiency, all of which negatively impact emissions.
Can I Replace the Crankshaft Position Sensor Myself?
Set out on a DIY adventure, but beware of the treacherous terrain of sensor wiring issues. You can replace the crankshaft position sensor yourself, but be prepared to navigate complex connections and potentially faulty circuits, or risk getting lost in the process.
Conclusion
Now that you’ve diagnosed and repaired the P0335 code, it’s vital to guarantee the issue is fully resolved. For instance, a 2015 Honda Civic owner experienced recurring stalling issues due to a faulty crankshaft position sensor. After replacing the sensor, the problem was resolved, and the car ran smoothly again. Remember to carefully inspect the sensor and related components to avoid similar issues in the future.
