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P0338 Lexus Code - Crankshaft Position Sensor 'A' Circuit High Input

Quick Answer

The P0338 diagnostic trouble code (DTC) for Lexus vehicles indicates an issue with the Crankshaft Position Sensor 'A' Circuit registering a high input signal. Common causes include Faulty crankshaft position sensor, Damaged or corroded wiring connecting the sensor to the ECM, Issues with the ECM. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

What it means
P0338 Lexus indicates Crankshaft Position Sensor 'A' Circuit High Input.
Common causes
Common causes include Faulty crankshaft position sensor, Damaged or corroded wiring connecting the sensor to the ECM, Issues with the ECM.
Severity
High - diagnose this code as soon as possible.
Can I drive?
Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
What is this?
Table of contents Created and updated by William Orellana on Sep 12, 2024
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Code P0338 Lexus Description

The P0338 diagnostic trouble code (DTC) for Lexus vehicles indicates an issue with the Crankshaft Position Sensor 'A' Circuit registering a high input signal. The crankshaft position sensor is a vital component that monitors the rotational speed and position of the crankshaft in the engine. This information is crucial for the engine control module (ECM) to accurately time the ignition and fuel injection processes.

OBDII Code P0338 Lexus - Crankshaft Position Sensor 'A' Circuit High Input
P0338 Lexus Code - Crankshaft Position Sensor 'A' Circuit High Input

Common Causes of P0338 Lexus

  1. Faulty crankshaft position sensor
  2. Damaged or corroded wiring connecting the sensor to the ECM
  3. Issues with the ECM
  4. Poor electrical connections
  5. Engine vibrations leading to sensor malfunction

Symptoms of P0338 Lexus

  1. Engine misfires or rough idling
  2. Difficulty starting the engine
  3. Reduced fuel efficiency
  4. Engine stalling or hesitation during acceleration
  5. Check Engine Light illuminated on the dashboard

How to Fix P0338 Lexus

  1. Diagnose the issue by using a scan tool to read the DTC and check the sensor's signal output.
  2. Inspect the wiring harness and connections for any damage or corrosion. Repair or replace as needed.
  3. Test the crankshaft position sensor using a multimeter to verify its functionality.
  4. If the sensor is faulty, replace it with a new OEM or aftermarket sensor.
  5. Clear the DTC and test drive the vehicle to ensure the issue has been resolved.

Cost to Fix P0338 Lexus

The cost of repairing a P0338 code on a Lexus vehicle can vary depending on the specific model and year of the vehicle, as well as the labor rates in your area. Generally, the cost of replacing a crankshaft position sensor can range from $100 to $300, including parts and labor. Additional costs may apply if wiring repairs or ECM replacement are necessary. It's recommended to consult with a certified mechanic or Lexus dealership for a more accurate estimate based on your vehicle's needs. Keep in mind that diagnostic time and labor rates can influence the overall cost of the repair.

What does this mean?

Tech Notes for P0338 Lexus

Sometimes and in some models, low battery voltage or a weak starter can trigger a Crankshaft Position Sensor code. Before replacing any parts, recharge or replaced battery.

When is the Code Detected?

The crankshaft position sensor (POS) signal sent to the Electronic Control Module (ECM) is high

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About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

Frequently Asked Questions about P0338 Lexus Code

1. What are the common symptoms of OBDII code P0338 in a Lexus related to the Crankshaft Position Sensor 'A' Circuit High Input?

The common symptoms include engine misfires, rough idling, stalling, difficulty starting the engine, and a decrease in fuel efficiency.

2. What are the possible causes of OBDII code P0338 in a Lexus indicating a high input in the Crankshaft Position Sensor 'A' circuit?

Potential causes may include a faulty crankshaft position sensor, damaged wiring or connectors in the sensor circuit, issues with the sensor's internal circuitry, or a problem with the engine control module.

3. How can I diagnose the OBDII code P0338 in my Lexus to confirm an issue with the Crankshaft Position Sensor 'A' Circuit High Input?

Diagnosis typically involves using an OBDII scanner to retrieve the trouble code, performing a visual inspection of the sensor and its wiring, testing the sensor's resistance, and checking for proper voltage signals.

4. What are the recommended steps for repairing OBDII code P0338 in a Lexus caused by a high input in the Crankshaft Position Sensor 'A' circuit?

Repair steps may involve replacing the faulty crankshaft position sensor, repairing or replacing damaged wiring or connectors, clearing the trouble code, and performing a thorough test drive to ensure the issue is resolved.

5. Can a DIY enthusiast fix OBDII code P0338 in a Lexus related to the Crankshaft Position Sensor 'A' Circuit High Input?

While some experienced DIYers may be able to replace the crankshaft position sensor themselves, diagnosing and repairing electrical issues related to this code may require advanced knowledge and tools, so professional help is often recommended.

6. Is it safe to continue driving my Lexus with OBDII code P0338 indicating a high input in the Crankshaft Position Sensor 'A' circuit?

It's not recommended to drive the vehicle with this issue, as it can lead to further engine damage, poor performance, and potential safety hazards. It's best to address the problem promptly.

7. How much does it typically cost to repair OBDII code P0338 in a Lexus due to a high input in the Crankshaft Position Sensor 'A' circuit?

The cost of repair can vary depending on the root cause of the issue, the labor rates in your area, and whether you choose to go to a dealership or an independent mechanic. It's advisable to get multiple quotes for an accurate estimate.

8. Are there any preventive maintenance measures I can take to avoid encountering OBDII code P0338 in my Lexus related to the Crankshaft Position Sensor 'A' Circuit High Input?

Regularly scheduled maintenance, such as inspecting and replacing sensors as recommended by the manufacturer, keeping the engine well-tuned, and addressing any warning signs promptly, can help prevent issues like this code from occurring.

9. How long does it typically take to repair OBDII code P0338 in a Lexus caused by a high input in the Crankshaft Position Sensor 'A' circuit?

The repair time can vary based on the exact cause of the issue, the availability of parts, and the mechanic's workload. In general, it may take a few hours to a full day to diagnose and repair this code.

10. Can OBDII code P0338 in a Lexus related to the Crankshaft Position Sensor 'A' Circuit High Input cause permanent damage to the engine if left unresolved?

Continuing to drive the vehicle with this issue can potentially cause damage to the engine, especially if it leads to poor engine timing or misfires. It's crucial to address the problem promptly to prevent further damage.

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