P1335 Code: Complete DIY Repair Guide

The P1335 trouble code is a diagnostic code that indicates a problem with the crankshaft position sensor circuit. This sensor plays a crucial role in engine timing and performance by monitoring the position and rotational speed of the crankshaft. When the engine control module (ECM) detects an issue with this sensor’s signal, it triggers the P1335 code and may cause various drivability problems.

Symptoms of P1335 Code

When your vehicle experiences a P1335 code, you may notice several symptoms that can affect your driving experience. These symptoms can vary in severity and may include:

1. Check Engine Light (CEL) illumination
2. Engine misfires or rough idle
3. Difficulty starting the engine or extended cranking time
4. Stalling or sudden loss of power while driving
5. Reduced fuel efficiency
6. Erratic or inconsistent engine performance
7. Complete engine failure to start in severe cases

It’s important to note that these symptoms can also be indicative of other engine issues, so proper diagnosis is crucial to determine if the P1335 code is the root cause.

Technical Explanation of P1335 Code

The P1335 code specifically relates to the crankshaft position sensor (CKP) circuit. This sensor is designed to monitor the position and rotational speed of the crankshaft, which is essential for proper engine timing and fuel injection. The sensor typically consists of a magnetic pickup or Hall effect sensor that reads the teeth on the crankshaft reluctor wheel.

When the engine is running, the crankshaft position sensor generates a signal pattern based on the passing of the reluctor wheel teeth. This signal is sent to the engine control module (ECM), which uses this information to determine:

1. Engine RPM
2. Crankshaft position
3. Timing for fuel injection
4. Ignition timing

If the ECM detects an interruption, inconsistency, or absence of this signal while the engine is running, it will set the P1335 code. This code is often manufacturer-specific, with slight variations in definition between different vehicle makes.

Step-by-Step Diagnosis of P1335 Code

To properly diagnose the P1335 code, follow these steps:

1. Connect an OBD-II scanner to the vehicle’s diagnostic port and retrieve all stored codes and freeze frame data.
2. Clear the codes and test drive the vehicle to see if the P1335 code returns.
3. If the code returns, visually inspect the crankshaft position sensor and its wiring harness for any obvious damage, corrosion, or loose connections.
4. Check the sensor’s mounting to ensure it’s secure and properly aligned with the reluctor wheel.
5. Use a digital multimeter to test the sensor’s resistance. Compare the readings to the manufacturer’s specifications in the vehicle’s service manual.
6. Inspect the reluctor wheel for any damage, missing teeth, or excessive rust that could interfere with the sensor’s readings.
7. Use an oscilloscope to observe the crankshaft position sensor’s signal pattern while the engine is running. Look for any irregularities or dropouts in the signal.
8. If possible, test the sensor’s output voltage while the engine is cranking. It should produce a clear AC voltage signal.
9. Check the wiring between the sensor and the ECM for any breaks, shorts, or resistance issues.
10. Verify that the ECM is receiving the correct voltage and ground signals.

Solution Methods for P1335 Code

Once you’ve diagnosed the issue, you can proceed with the following solutions:

1. Replace the crankshaft position sensor:

• Locate the sensor, typically near the crankshaft pulley or on the engine block
• Disconnect the electrical connector
• Remove the mounting bolt and extract the old sensor
• Install the new sensor, ensuring proper alignment
• Tighten the mounting bolt to the specified torque
• Reconnect the electrical connector

1. Repair or replace the wiring harness:

• Identify any damaged sections of the wiring
• Cut out the damaged portion and splice in new wiring
• Use heat-shrink tubing to insulate the repaired sections
• Secure the harness with zip ties to prevent future damage

1. Clean or repair sensor connections:

• Disconnect the sensor connector
• Clean the terminals with electrical contact cleaner
• Check for bent or pushed-back pins
• Apply dielectric grease to prevent future corrosion
• Reconnect and ensure a tight fit

1. Replace the crankshaft reluctor wheel:

• This is a more involved repair that may require removing the crankshaft
• Consult your vehicle’s service manual for specific instructions
• Consider professional help for this repair

1. Update or reflash the ECM:

• Check with your dealership for any available software updates
• This may resolve issues related to ECM interpretation of sensor signals

Cost Estimates for P1335 Code Repairs

The cost of repairing a P1335 code can vary depending on the root cause and your vehicle’s make and model. Here are some estimated costs:

• Crankshaft position sensor replacement: $100 – $300
• Wiring harness repair: $150 – $400
• ECM reflash or update: $100 – $200
• Reluctor wheel replacement: $500 – $1500 (due to labor intensity)

These estimates include parts and labor. DIY repairs can significantly reduce costs, especially for sensor replacement or wiring repairs.

Warnings and Recommendations

Warning: Ignoring the P1335 code can lead to severe engine damage or complete failure. Address this issue promptly to avoid costly repairs.

Recommendations:

• Always use high-quality, OEM or equivalent replacement parts
• Follow proper safety procedures when working on your vehicle, including disconnecting the battery when necessary
• If you’re unsure about any repair step, consult a professional mechanic
• After repairs, clear the code and perform a thorough test drive to ensure the issue is resolved
• Regular maintenance can prevent many sensor-related issues

Preventing Future P1335 Codes

To minimize the chances of encountering a P1335 code in the future:

1. Follow your vehicle’s recommended maintenance schedule
2. Keep engine components clean and free from excessive oil and debris
3. Regularly inspect wiring harnesses for signs of wear or damage
4. Address any engine performance issues promptly
5. Use high-quality fuel and oil as recommended by your vehicle manufacturer
6. Avoid exposure to extreme environmental conditions when possible

By following these preventive measures, you can help ensure the longevity and reliability of your vehicle’s crankshaft position sensor system.

Frequently Asked Questions About P1335

• Can I drive my car with a P1335 code?
  It’s not recommended to drive with a P1335 code. The engine may stall unexpectedly or fail to start, potentially leaving you stranded or causing an accident.
• How urgent is it to fix a P1335 code?
  A P1335 code should be addressed as soon as possible. Ignoring it can lead to poor fuel economy, reduced performance, and potential engine damage.
• Will a P1335 code clear itself?
  The code may clear temporarily if the issue resolves, but it will likely return if the underlying problem isn’t fixed. Proper diagnosis and repair are necessary for a permanent solution.
• Can a bad battery cause a P1335 code?
  While unlikely, a weak battery can cause voltage fluctuations that might trigger sensor-related codes. However, a bad battery typically causes other symptoms and codes first.
• How long does it take to replace a crankshaft position sensor?
  For most vehicles, replacing the crankshaft position sensor takes 1-2 hours. However, the time can vary depending on the sensor’s location and accessibility.
• Can I replace the crankshaft position sensor myself?
  Many DIY mechanics can replace the sensor themselves. However, you’ll need basic tools, a service manual, and some mechanical knowledge. If unsure, consult a professional.
• Is the P1335 code specific to certain car makes?
  While P1335 is a generic OBD-II code, its exact meaning can vary slightly between manufacturers. It’s commonly associated with Nissan, Toyota, and some Ford vehicles.
• Can a P1335 code be caused by low oil pressure?
  Low oil pressure typically doesn’t directly cause a P1335 code. However, severely low oil levels can damage engine components, potentially affecting the crankshaft position sensor’s operation.

In conclusion, the P1335 code is a serious diagnostic trouble code that requires prompt attention. While it primarily indicates an issue with the crankshaft position sensor circuit, the root cause can vary from a simple sensor failure to more complex wiring or ECM problems. By following the diagnostic steps outlined in this guide, you can identify the specific issue affecting your vehicle and take appropriate action. Remember, if you’re ever unsure about performing repairs yourself, it’s always best to consult with a qualified automotive technician to ensure the safety and reliability of your vehicle.