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Engine-Codes – Scion – P0338 Scion

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

Quick Answer

The P0338 diagnostic trouble code (DTC) for Scion vehicles indicates that the crankshaft position sensor 'A' circuit is experiencing a high input. Common causes include Faulty crankshaft position sensor, Damaged sensor wiring or connectors, Malfunctioning 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 Scion indicates Crankshaft Position Sensor 'A' Circuit High Input.
Common causes
Common causes include Faulty crankshaft position sensor, Damaged sensor wiring or connectors, Malfunctioning 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 Scion Description

The P0338 diagnostic trouble code (DTC) for Scion vehicles indicates that the crankshaft position sensor 'A' circuit is experiencing a high input. The crankshaft position sensor is a vital component of your vehicle's engine management system, as it monitors the rotational speed and position of the crankshaft. This information is crucial for proper fuel injection timing and ignition system operation. When the sensor detects a high input signal, it means that the voltage being sent to the engine control module (ECM) is outside of the expected range.

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

Common Causes of P0338 Scion

  1. Faulty crankshaft position sensor
  2. Damaged sensor wiring or connectors
  3. Malfunctioning ECM
  4. Issues with the reluctor ring on the crankshaft
  5. Electrical interference or shorts in the sensor circuit

Symptoms of P0338 Scion

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

How to Fix P0338 Scion

  1. Begin by connecting a diagnostic scanner to the vehicle's OBD-II port to retrieve the specific DTC (P0338).
  2. Inspect the crankshaft position sensor, wiring, and connectors for any visible damage or corrosion.
  3. Test the sensor's output voltage with a multimeter to determine if it is within the manufacturer's specifications.
  4. If the sensor is faulty, replace it with a new OEM or high-quality aftermarket unit.
  5. Clear the DTC from the ECM's memory using the diagnostic scanner and test drive the vehicle to verify that the issue has been resolved.

Cost to Fix P0338 Scion

The typical repair costs for addressing a P0338 code on a Scion vehicle can range from $100 to $300, depending on the specific cause of the issue and the cost of parts and labor. It is important to note that diagnosis time and labor rates at auto repair shops can vary, so it is advisable to consult with a trusted mechanic to get a more accurate estimate based on your location and vehicle details.

What does this mean?

Tech Notes for P0338 Scion

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 Scion Code

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

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

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

Possible causes can include a faulty crankshaft position sensor, damaged wiring or connectors in the sensor circuit, or issues with the engine control module (ECM).

3. How can I diagnose the Crankshaft Position Sensor 'A' Circuit High Input issue in my Scion when experiencing code P0338?

You can use a multimeter to test the resistance of the crankshaft position sensor, inspect the sensor wiring and connectors for any damage, and check for proper voltage signals from the sensor to the ECM.

4. Is it safe to drive my Scion with OBDII code P0338 related to the Crankshaft Position Sensor 'A' Circuit High Input?

It is not recommended to drive your vehicle with this issue as it may lead to further engine damage or sudden stalling, potentially putting you at risk on the road.

5. Can I repair the Crankshaft Position Sensor 'A' Circuit High Input problem in my Scion myself?

Depending on your skill level and access to tools, you may be able to replace the crankshaft position sensor, repair wiring issues, or reset the ECM yourself. However, professional diagnosis and repair are recommended for complex issues.

6. How much does it typically cost to repair OBDII code P0338 in a Scion caused by a high input in the Crankshaft Position Sensor 'A' circuit?

The cost can vary based on the specific cause of the issue, but it may range from $100 to $300 for parts and labor if a sensor replacement or wiring repair is needed.

7. Will resetting the OBDII code P0338 in my Scion make the issue go away permanently?

Simply resetting the code may temporarily clear the check engine light, but if the underlying problem causing the Crankshaft Position Sensor 'A' Circuit High Input is not addressed, the code is likely to reappear.

8. How important is the Crankshaft Position Sensor in a Scion, and what role does it play in the engine's operation?

The crankshaft position sensor is crucial for monitoring the position and speed of the crankshaft, providing essential data to the ECM to ensure proper fuel injection timing and ignition spark control.

9. Can extreme weather conditions or environmental factors trigger OBDII code P0338 in a Scion due to the Crankshaft Position Sensor 'A' Circuit High Input?

Extreme temperatures or moisture exposure can potentially affect the sensor's performance and lead to a high input signal, triggering the P0338 fault code.

10. Are there any preventive maintenance tips to avoid encountering OBDII code P0338 related to the Crankshaft Position Sensor 'A' Circuit High Input in my Scion?

Regularly inspecting and cleaning the sensor, ensuring proper wiring connections, and addressing any engine performance issues promptly can help prevent the occurrence of this code.

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