P1337 Code: Complete DIY Repair Guide

The P1337 trouble code is a diagnostic code related to the crankshaft position sensor system in vehicles. This code indicates that there is no signal or an intermittent signal from the crankshaft position sensor, which is crucial for proper engine operation. When this code appears, it typically means the engine control module (ECM) is not receiving the necessary information about the crankshaft’s position and rotation speed.

Symptoms of P1337 Code

When your vehicle triggers the P1337 code, you may experience several symptoms that can affect your driving experience and engine performance. Being aware of these symptoms can help you identify the issue quickly and take appropriate action. Here are the common symptoms associated with the P1337 code:

1. Check Engine Light Illumination: The most obvious symptom is the illumination of the check engine light on your dashboard. This is often the first indication that something is wrong with your vehicle’s systems.
2. Engine Misfires: You may notice that your engine runs roughly or misfires, especially during acceleration or at idle. This is because the engine control module is not receiving accurate information about the crankshaft’s position, leading to improper fuel injection and ignition timing.
3. Hard Starting or No-Start Condition: In some cases, the engine may be difficult to start or may not start at all. This is because the crankshaft position sensor provides crucial information for the engine to initiate the starting process.
4. Stalling: The engine may stall unexpectedly, particularly when coming to a stop or during low-speed maneuvers. This can be dangerous if it occurs in traffic.
5. Poor Fuel Economy: You might notice a decrease in fuel efficiency as the engine is not operating at optimal performance due to incorrect timing.
6. Reduced Engine Performance: The vehicle may experience a loss of power, especially during acceleration. You might feel like the engine is not responding as it should when you press the accelerator.
7. Erratic Idle: The engine may idle roughly or at an inconsistent RPM, sometimes fluctuating up and down.
8. Limp Mode Activation: In some vehicles, the detection of a P1337 code may cause the car to enter “limp mode,” where engine performance is deliberately limited to prevent damage.

It’s important to note that these symptoms can vary depending on the make and model of your vehicle and the severity of the issue causing the P1337 code. Some vehicles may exhibit all of these symptoms, while others may only show one or two. Additionally, these symptoms can also be indicative of other issues, which is why proper diagnosis is crucial.

Diagnosing the P1337 Code

Diagnosing the P1337 code requires a systematic approach to identify the root cause of the problem. Here’s a step-by-step guide to help you diagnose the issue:

1. Verify the code: Use an OBD-II scanner to confirm that P1337 is the only code present. If there are multiple codes, address them in order of appearance.
2. Visual inspection:

1. Locate the crankshaft position sensor. It’s typically found near the crankshaft pulley or flywheel.
2. Check for visible damage to the sensor, its wiring harness, and connectors.
3. Look for signs of oil leaks or debris that might be interfering with the sensor’s operation.
4. Check electrical connections:

1. Ensure all connectors related to the crankshaft position sensor are securely fastened.
2. Inspect for corrosion, bent pins, or damage to the connectors.
3. Clean any corroded connections with electrical contact cleaner.
4. Test the crankshaft position sensor:

1. Use a multimeter to check the resistance of the sensor. Refer to your vehicle’s service manual for the correct resistance values.
2. Test the voltage output of the sensor while the engine is cranking. You should see a fluctuating AC voltage if the sensor is working correctly.
3. Inspect the reluctor wheel:

1. Remove the crankshaft position sensor to access the reluctor wheel.
2. Check for damaged or missing teeth on the wheel.
3. Ensure the wheel is securely attached to the crankshaft and not wobbling.
4. Check wiring integrity:

1. Perform a continuity test on the wiring between the sensor and the ECM.
2. Look for any signs of fraying, breaks, or damage to the wiring insulation.
3. Scan for live data:

1. Use an advanced OBD-II scanner to monitor live data from the crankshaft position sensor.
2. Check for consistent RPM readings and signal pattern while the engine is running.
3. Test the ECM:

1. If all other components check out, the issue may be with the ECM itself.
2. Consider having the ECM tested by a professional if you’ve ruled out other potential causes.

Warning: Some of these diagnostic steps may require specialized tools and expertise. If you’re not comfortable performing these tests, it’s best to consult a professional mechanic.

Solutions for P1337 Code

Once you’ve diagnosed the issue causing the P1337 code, you can proceed with the appropriate solution. Here are the most common fixes for this trouble code:

1. Replace the Crankshaft Position Sensor:

1. Purchase a new crankshaft position sensor specific to your vehicle make and model.
2. Disconnect the battery before starting work.
3. Locate and unplug the old sensor.
4. Remove any mounting bolts and extract the old sensor.
5. Install the new sensor, ensuring it’s seated correctly.
6. Reconnect the electrical connector and secure any mounting bolts.
7. Reconnect the battery and clear the code with an OBD-II scanner.
8. Repair or Replace Wiring:

1. Identify any damaged sections of wiring in the crankshaft position sensor circuit.
2. Cut out the damaged portion and splice in new wire of the same gauge.
3. Use heat-shrink tubing or electrical tape to insulate the repaired sections.
4. If the damage is extensive, consider replacing the entire wiring harness.
5. Clean or Replace the Reluctor Wheel:

1. Remove any debris or buildup on the reluctor wheel using a soft brush or cloth.
2. If the wheel is damaged, it will need to be replaced. This often requires removing the crankshaft pulley or flywheel.
3. Ensure the new reluctor wheel is properly aligned and securely fastened.
4. Repair Electrical Connections:

1. Clean corroded connectors with electrical contact cleaner and a wire brush.
2. If connectors are damaged, replace them with new ones.
3. Apply dielectric grease to connections to prevent future corrosion.
4. Update ECM Software:

1. Check with your vehicle manufacturer for any available ECM software updates.
2. Have the ECM reprogrammed by a dealership or qualified technician if updates are available.
3. Replace the ECM:

1. If all other solutions fail, and you’ve confirmed the ECM is faulty, it may need replacement.
2. This should be done by a professional as it often requires programming to your specific vehicle.

Cost Estimates:

• Crankshaft Position Sensor Replacement: $100 – $250
• Wiring Repair: $50 – $200
• Reluctor Wheel Replacement: $200 – $500
• ECM Reprogramming: $50 – $150
• ECM Replacement: $500 – $2000

Warnings and Recommendations:

• Always disconnect the battery before working on electrical components.
• Use caution when working near moving engine parts.
• If you’re unsure about any repair steps, consult a professional mechanic.
• After repairs, clear the code and test drive the vehicle to ensure the problem is resolved.
• Regular maintenance can prevent many sensor-related issues.

Preventing Future P1337 Codes

To minimize the chances of encountering the P1337 code in the future, consider the following preventive measures:

1. Regular Maintenance: Follow your vehicle’s recommended maintenance schedule, including oil changes and engine inspections.
2. Keep Engine Clean: Regularly clean the engine bay to prevent oil and debris buildup that can affect sensor performance.
3. Use Quality Parts: When replacing components, use high-quality, OEM or equivalent parts to ensure proper fit and function.
4. Address Oil Leaks Promptly: Oil leaks can damage sensors and electrical connections. Fix them as soon as they’re detected.
5. Protect Wiring: Ensure all wiring is properly secured and protected from heat and moving parts.
6. Regular Inspections: Periodically check electrical connections and wiring for signs of wear or damage.
7. Avoid Extreme Conditions: When possible, avoid driving through deep water or in extremely dusty conditions that can damage sensors.

By following these guidelines and addressing any issues promptly, you can help ensure your vehicle’s crankshaft position sensor system remains in good working order, reducing the likelihood of encountering the P1337 code in the future.

Frequently Asked Questions About P1337

• Can I drive my car with a P1337 code?
  It’s not recommended to drive with this code as it can lead to engine stalling or damage. If you must drive, do so cautiously and for short distances only.
• How urgent is it to fix a P1337 code?
  This code should be addressed as soon as possible. Ignoring it can lead to poor engine performance, increased fuel consumption, and potential engine damage.
• Will a P1337 code clear itself?
  Generally, no. The code will remain until the underlying issue is fixed and the code is cleared with a scanner.
• How much does it typically cost to fix a P1337 code?
  Costs can range from $100 to $500 for sensor replacement or wiring repairs. In rare cases involving ECM issues, costs could exceed $1000.
• Can a bad battery cause a P1337 code?
  While unlikely, a weak battery can cause voltage fluctuations that might trigger sensor-related codes. It’s worth checking the battery’s condition during diagnosis.
• Is the P1337 code specific to certain car makes?
  While P1337 is a generic OBD-II code, it’s more commonly seen in Honda and Acura vehicles. However, it can appear in other makes as well.
• Can I replace the crankshaft position sensor myself?
  Yes, in many cases this is a DIY-friendly repair. However, the sensor’s location can vary by vehicle and may sometimes require special tools or procedures.
• How long does it take to diagnose and fix a P1337 code?
  Diagnosis typically takes 1-2 hours. Repairs can take anywhere from 30 minutes to several hours, depending on the underlying cause and the vehicle’s design.

In conclusion, the P1337 code is a serious indicator of issues with your vehicle’s crankshaft position sensor system. While it can be intimidating, understanding the causes, symptoms, and solutions can help you address the problem effectively. Remember, if you’re ever unsure about diagnosing or repairing this issue, it’s always best to consult with a qualified automotive technician. Proper maintenance and prompt attention to warning signs can help prevent this and other engine-related issues, ensuring your vehicle runs smoothly and reliably for years to come.