Engine-Codes.com
Engine-Codes – Generic – P0338

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

Quick Answer

The P0338 diagnostic trouble code (DTC) indicates a problem with the crankshaft position sensor 'A' circuit having a high input. Common causes include Faulty crankshaft position sensor, Damaged or corroded wiring/connectors, Poor electrical connection. 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 indicates Crankshaft Position Sensor 'A' Circuit High Input.
Common causes
Common causes include Faulty crankshaft position sensor, Damaged or corroded wiring/connectors, Poor electrical connection.
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 Aug 18, 2024
💬 Need more help? Ask Auto Expert for instant answers — it's free!
AutoCodes App

Fix Your Car Smarter

Try the New AutoCodes App!

Get complete OBDII diagnostics, repair solutions, and cost estimates, plus AI chat support on demand.

AutoCodes App on Google Play

Code P0338 Description

The P0338 diagnostic trouble code (DTC) indicates a problem with the crankshaft position sensor 'A' circuit having a high input. The crankshaft position sensor is a vital component in the engine management system, responsible for monitoring the position and speed of the crankshaft. This information is crucial for the engine control module (ECM) to accurately determine ignition timing and fuel injection timing.

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

Common Causes of P0338

  1. Faulty crankshaft position sensor
  2. Damaged or corroded wiring/connectors
  3. Poor electrical connection
  4. Engine timing issues
  5. ECM malfunction

Symptoms of P0338

  1. Engine misfires or rough idling
  2. Difficulty starting the engine
  3. Reduced fuel efficiency
  4. Engine stalling
  5. Illuminated Check Engine Light

How to Fix P0338

  1. Diagnose the issue by using a scan tool to confirm the P0338 code and check for any related codes.
  2. Inspect the crankshaft position sensor and its wiring for any damage or corrosion. Replace the sensor if necessary.
  3. Check and repair any loose or damaged wiring/connectors in the circuit.
  4. Clear the DTC and reset the ECM to see if the issue persists.
  5. Perform a road test to ensure the problem has been resolved.

Cost to Fix P0338

The cost of repairing a P0338 code can vary depending on the extent of the issue and the specific components that need to be replaced. Generally, the cost of replacing a crankshaft position sensor can range from $100 to $250, including parts and labor. Additional costs may apply if there are other underlying issues that need to be addressed. As mentioned earlier, labor rates at auto repair shops can vary, so it's recommended to obtain quotes from local shops for a more accurate estimate.

What does this mean?

Tech Notes for P0338

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

Need more information about the P0338 code?

Need more information on how to fix the P0338 code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P0338 code diagnosed by a professional: Find a repair shop in your area

Code P0338 Information for Specific Makes

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 Code

1. What are the common symptoms of OBDII code P0338 (Crankshaft Position Sensor 'A' Circuit High Input)?

- Common symptoms include engine misfires, rough idling, stalling, and difficulty starting the vehicle.

2. What can cause OBDII code P0338 to trigger?

- The code can be triggered by a faulty crankshaft position sensor, wiring issues, or a malfunction in the engine control module.

3. How can I diagnose the cause of OBDII code P0338?

- Diagnosing the code typically involves testing the crankshaft position sensor, inspecting its wiring for damage, and checking the engine control module for faults.

4. Is it safe to drive with OBDII code P0338 active?

- It is not recommended to drive with this code active, as it can lead to engine performance issues and potential breakdowns.

5. Can a faulty crankshaft position sensor cause OBDII code P0338?

- Yes, a faulty crankshaft position sensor is a common cause of this code, as it can send incorrect signals to the engine control module.

6. How can I repair OBDII code P0338?

- Repairing the code typically involves replacing the crankshaft position sensor, repairing any damaged wiring, and clearing the code from the engine control module.

7. Are there any DIY tips for fixing OBDII code P0338?

- DIY tips include checking the sensor's connection, inspecting the wiring for visible damage, and ensuring the sensor is properly aligned and secured.

8. Can weather conditions affect the triggering of OBDII code P0338?

- Extreme weather conditions can sometimes affect the performance of the crankshaft position sensor, leading to the triggering of this code.

9. How long does it take to repair OBDII code P0338?

- The repair time can vary depending on the exact cause of the code, but it typically takes a few hours to diagnose and replace the faulty sensor.

10. Will OBDII code P0338 cause permanent damage to the vehicle if left unrepaired?

- Ignoring this code can lead to further engine damage and decreased performance over time, so it is best to address the issue promptly.

Discuss the causes and fixes for P0338 OBDII Code

Submit a New Comment