Chevrolet P0335 Code – Master Your Crankshaft Sensor Diagnosis & Fix

The P0335 code indicates a problem with your Chevrolet’s crankshaft position sensor circuit. This critical sensor tells your engine’s computer exactly where the crankshaft is, essential for proper fuel injection and ignition timing. Ignoring this code can lead to rough idling, stalling, or even a no-start condition, requiring prompt attention.

Has your Chevrolet suddenly developed a stutter, stalled unexpectedly, or refused to start, leaving you scratching your head? These frustrating symptoms often point to a core engine management issue that demands your attention.

If your check engine light is on and you’ve pulled a P0335 code, you’re looking at an issue with your crankshaft position sensor. This guide will walk you through understanding, diagnosing, and ultimately fixing this common Chevrolet problem, empowering you to get your Chevy running smoothly again.

We’ll cover everything from common symptoms and causes to detailed diagnostic steps and repair strategies. Our goal is to provide you with the expertise needed to tackle this code confidently, whether you’re an everyday driver or a seasoned DIY mechanic.

What Does the Chevrolet P0335 Code Mean?

The chevrolet p0335 code specifically refers to an issue within the Crankshaft Position Sensor “A” Circuit. This sensor, often abbreviated as the CKP sensor, is vital for your engine’s operation.

It monitors the rotational speed and position of the crankshaft, sending this data to the Engine Control Module (ECM), also known as the Powertrain Control Module (PCM). This information is crucial for the ECM to accurately calculate ignition timing and fuel injection pulses.

When the PCM detects an erratic signal or no signal at all from the crankshaft position sensor, it sets the P0335 code. This indicates a general fault with the sensor or its circuit, rather than a specific type of failure.

The “A” in the code typically refers to the primary crankshaft position sensor if your vehicle has more than one. Without an accurate signal from this sensor, the engine struggles to determine when to fire the spark plugs or inject fuel, leading to significant drivability problems.

Common Symptoms of a P0335 Code in Your Chevrolet

A faulty crankshaft position sensor can manifest in several noticeable ways. Recognizing these symptoms early can help prevent further issues and guide your diagnostic process.

• Check Engine Light Illumination: This is almost always the first sign. Your dashboard will light up, signaling a fault detected by the ECM.
• Engine Cranks But Won’t Start: Without a proper signal, the ECM can’t time the ignition and fuel delivery, preventing the engine from firing up.
• Engine Stalling: The engine might suddenly cut out while driving, especially when coming to a stop or at low speeds. This can be particularly dangerous.
• Rough Idling or Misfires: An inconsistent signal can lead to incorrect timing, causing the engine to idle roughly or experience misfires.
• Reduced Engine Performance: You might notice a lack of power, poor acceleration, or hesitation during driving.
• Intermittent Problems: The symptoms might appear and disappear, making diagnosis tricky. This often happens as the sensor begins to fail completely.

Don’t ignore these warning signs. Addressing the P0335 code promptly can save you from more severe engine damage or being stranded on the side of the road.

Root Causes Behind the Chevrolet P0335 Code

Understanding the potential causes of the P0335 code is half the battle in fixing it. This code doesn’t always mean the sensor itself is bad; it points to a circuit issue, which could be electrical or mechanical.

Faulty Crankshaft Position Sensor

The most common culprit is a failed or failing Crankshaft Position Sensor. These sensors, often a Hall effect sensor or a magnetic pickup sensor, can wear out over time due to heat, vibration, and exposure to engine contaminants.

Internal shorts or open circuits within the sensor itself will prevent it from sending a consistent signal to the ECM.

Wiring Harness Issues

The wiring connecting the sensor to the ECM is susceptible to damage. Common issues include:

• Frayed or Damaged Wires: Rodent damage, abrasion against engine components, or improper installation can compromise the wiring harness.
• Corroded Connections: Moisture and dirt can cause corrosion at the sensor connector or the ECM connector, leading to poor electrical contact.
• Open or Short Circuits: A break in the wire (open circuit) or a wire touching ground or another power source (short circuit) will disrupt the signal.

Damaged Reluctor Ring

The crankshaft position sensor reads pulses from a spinning metal wheel called the reluctor ring (also known as a tone wheel or trigger wheel). This ring has teeth or notches that the sensor detects.

If the reluctor ring is bent, damaged, or has missing teeth, the sensor will receive an incorrect or inconsistent signal, even if the sensor itself is perfectly fine. This can happen due to impact or engine internal issues.

ECM/PCM Malfunction

While less common, a faulty Engine Control Module (ECM) or Powertrain Control Module (PCM) could be the cause. If the ECM cannot properly process the sensor’s signal or has internal issues with its 5-volt reference circuit, it can trigger the P0335 code.

This is usually a last resort diagnosis after ruling out all other possibilities, as ECM replacement is costly and often requires reprogramming.

Diagnosing the Chevrolet P0335 Code: Step-by-Step

Diagnosing the P0335 code requires a methodical approach. Always prioritize safety and disconnect the battery when performing electrical work or working on engine components.

1. Scan for Codes and Freeze Frame Data: Use an OBD-II scanner to confirm the P0335 code. Pay close attention to the freeze frame data, which captures engine conditions (RPM, engine load, temperature) when the code was set. This can offer valuable clues.
2. Visual Inspection:
   • Locate the crankshaft position sensor. Its location varies by Chevrolet model, but it’s typically mounted near the crankshaft, often on the engine block or transmission bell housing.
   • Inspect the sensor and its wiring harness connector for any visible damage, corrosion, or loose connections.
   • Check the wiring for any signs of fraying, cuts, or rodent damage along its entire length.
3. Check for Proper Voltage:
   • With the ignition on (engine off), use a multimeter to check the 5-volt reference circuit at the sensor connector. You should see approximately 5 volts on the reference wire.
   • Also, check for a good ground connection at the sensor connector.
4. Test Sensor Resistance (if applicable): Some older magnetic pickup sensors can be tested for resistance. Consult your vehicle’s specific service manual for the correct specifications. Hall effect sensors typically cannot be tested this way.
5. Signal Output Test (Oscilloscope Recommended):
   • The most accurate way to test a crankshaft position sensor is with an oscilloscope. This tool allows you to view the sensor’s live waveform.
   • A healthy sensor will produce a clean, consistent square wave (Hall effect) or sine wave (magnetic pickup) as the engine cranks. Erratic, absent, or distorted waveforms indicate a faulty sensor or reluctor ring issue.
   • If an oscilloscope isn’t available, some advanced scan tools can display live data PIDs for crankshaft position, which can show erratic RPM readings during cranking if the sensor is failing.
6. Inspect the Reluctor Ring: If the sensor and wiring appear good, the reluctor ring might be the problem. This often requires removing the sensor for a visual inspection of the ring through the sensor’s bore. In some cases, access might require further engine disassembly.

Troubleshooting Matrix for Chevrolet P0335 Code

This matrix helps narrow down the potential issue based on your diagnostic findings.

Repairing the P0335 Code: Solutions and Strategies

Once you’ve pinpointed the cause of your chevrolet p0335 code, it’s time for the fix. The repair steps will depend directly on your diagnostic findings.

Replacing the Crankshaft Position Sensor

If your diagnostics point to a faulty sensor, replacement is usually straightforward for a DIYer. Always use an OEM-quality replacement part for reliability.

1. Safety First: Disconnect the negative battery terminal. Allow the engine to cool down completely.
2. Locate the Sensor: Refer to your vehicle’s service manual for the exact location. It’s often held in place by one or two bolts.
3. Disconnect the Connector: Carefully unclip the electrical connector from the sensor. Be gentle, as plastic clips can become brittle with age.
4. Remove the Old Sensor: Use the appropriate wrench or socket to remove the retaining bolt(s). Gently pull the sensor out of its bore. Sometimes it might be stuck due to grime; a slight twist can help.
5. Install the New Sensor: Apply a thin coat of clean engine oil to the O-ring of the new sensor (if present) to aid installation and sealing. Insert the new sensor into the bore and tighten the retaining bolt(s) to the manufacturer’s specified torque.
6. Reconnect and Clear Codes: Reconnect the electrical connector and the negative battery terminal. Use your OBD-II scanner to clear the P0335 code.

Wiring Harness Repair

If you found damaged wiring or corroded connectors, repair them diligently.

• Wire Repair: For frayed or cut wires, use appropriate crimp connectors and heat shrink tubing for a durable, weather-sealed repair. Avoid simply taping wires, as this is a temporary fix.
• Connector Repair: If pins are corroded, try cleaning them with electrical contact cleaner and a small brush. If the connector housing is cracked or pins are severely damaged, you may need to replace the entire connector pigtail.

Addressing Reluctor Ring Damage

A damaged reluctor ring is a more serious issue. In many Chevrolet engines, the reluctor ring is pressed onto the crankshaft or integrated into the flywheel/flexplate. Replacing it often requires significant engine disassembly, such as removing the transmission or even the crankshaft.

This is usually a job best left to a professional mechanic due to the complexity and specialized tools required. If you suspect reluctor ring damage, consult a trusted shop.

Crankshaft Position Variation Learn Procedure

After replacing the crankshaft position sensor, many modern Chevrolet vehicles require a Crankshaft Position Variation Learn Procedure. This procedure allows the ECM to “learn” the unique characteristics of the new sensor and reluctor ring combination.

Without performing this, the P0335 code might return, or you might experience rough idling or misfires (P0300 series codes). This procedure typically requires a professional-grade scan tool capable of initiating the “CASE Learn” (Crankshaft Angle Sensor Learn) function.

If you don’t have access to such a tool, a visit to a dealership or a well-equipped independent shop will be necessary after replacing the sensor.

Preventative Maintenance for Your Crankshaft Position Sensor

While crankshaft position sensors are designed to last, a few preventative measures can help ensure their longevity and reliability in your Chevrolet, especially if you drive off-road or in harsh conditions.

• Regular Visual Inspections: During oil changes or other under-hood checks, take a moment to visually inspect the sensor’s wiring and connector. Look for any signs of chafing, cracks, or corrosion.
• Protect Wiring: If you’re working on other engine components, be mindful of the sensor’s wiring harness. Ensure it’s properly routed and secured away from hot exhaust components, sharp edges, or moving parts. Use zip ties or loom clamps as needed.
• Avoid Contaminants: While sensors are sealed, excessive exposure to oil, coolant, or road grime can degrade the wiring insulation over time. Keep your engine bay reasonably clean.
• Address Other Engine Issues Promptly: Vibrations from engine misfires or worn engine mounts can stress sensors and wiring. Fixing underlying issues like a P0300 random misfire code can indirectly protect your CKP sensor.

These simple checks can help you catch potential issues before they lead to a full-blown P0335 code and leave you stranded.

When to Call a Licensed Professional

While many aspects of diagnosing and replacing a crankshaft position sensor are DIY-friendly, there are specific scenarios where calling a licensed professional is the safest and most efficient course of action.

• Complex Diagnostics: If you’ve performed basic checks and the issue remains elusive, or if you lack an oscilloscope for signal testing, a professional can offer advanced diagnostic capabilities.
• Reluctor Ring Damage: As mentioned, replacing a damaged reluctor ring is a major engine repair. Unless you have extensive engine rebuilding experience and specialized tools, this is a job for a seasoned mechanic.
• ECM/PCM Issues: If all other components test good and you suspect an ECM fault, a professional can accurately diagnose and replace/reprogram the module.
• Crankshaft Position Variation Learn Procedure: If you don’t have a professional-grade scan tool, you’ll need a shop to perform this critical step after sensor replacement.
• Safety Concerns: If you’re uncomfortable working around hot engine components, tight spaces, or dealing with electrical systems, don’t hesitate to seek expert help.

Remember, your safety and the proper functioning of your vehicle are paramount. A professional diagnosis can save you time, money, and frustration in the long run.

Frequently Asked Questions About the Chevrolet P0335 Code

Can I drive my Chevrolet with a P0335 code?

It is generally not recommended to drive with a P0335 code. The engine’s performance will be compromised, leading to stalling, rough running, or even a no-start condition. Driving could also potentially cause further damage to other engine components due to incorrect timing or fuel delivery. Address the issue as soon as possible.

What is the typical cost to fix a P0335 code?

The cost varies significantly depending on the underlying cause. Replacing just the crankshaft position sensor itself can range from $150-$400, including parts and labor. If the issue is wiring-related, it might be less. However, if the reluctor ring is damaged, costs can soar into the thousands due due to the extensive labor required for engine disassembly.

How long does a crankshaft position sensor last?

Crankshaft position sensors are designed to last the lifetime of the vehicle, often exceeding 100,000 to 150,000 miles. However, like any electronic component exposed to heat and vibration, they can fail prematurely. Environmental factors, engine vibrations, and electrical surges can all contribute to early failure.

Does a P0335 code affect fuel economy?

Yes, a P0335 code can absolutely affect fuel economy. When the crankshaft position sensor provides an erratic or absent signal, the ECM cannot accurately time fuel injection and ignition. This often leads to the engine running inefficiently, potentially rich or lean, and can result in a noticeable drop in gas mileage. It might also cause the engine to enter a “limp mode,” further impacting efficiency.

Get Your Chevy Back on Track

Dealing with a chevrolet p0335 code can be frustrating, but with the right knowledge and tools, it’s a fixable problem. By systematically diagnosing the symptoms and causes, you can confidently identify whether the issue lies with the crankshaft position sensor itself, its wiring, or even the reluctor ring.

Remember to always prioritize safety, use quality replacement parts, and don’t hesitate to seek professional help when the task exceeds your comfort or expertise. Getting this critical sensor functioning correctly will restore your Chevrolet’s smooth performance and reliability, ensuring you’re ready for the road ahead. Happy wrenching!

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Robert Lozano

Robert Lozano is the founder of Engine Needs. With a passion for engines and automotive technology, he provides expert reviews, guides, and advice to help drivers make smarter vehicle decisions.

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