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

Quick Answer

The P0338 code for a Mercedes-Benz indicates a high input in the circuit of the crankshaft position sensor 'A'. Common causes include Faulty crankshaft position sensor, Damaged wiring or connectors in the sensor circuit, Issues with the engine control module. 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 Mercedes-Benz indicates Crankshaft Position Sensor 'A' Circuit High Input.
Common causes
Common causes include Faulty crankshaft position sensor, Damaged wiring or connectors in the sensor circuit, Issues with the engine control module.
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 06, 2024
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Code P0338 Mercedes-Benz Description

The P0338 code for a Mercedes-Benz indicates a high input in the circuit of the crankshaft position sensor 'A'. The crankshaft position sensor is a vital component in the engine management system, as it helps to determine the position of the crankshaft and enables the engine control module to calculate ignition timing and fuel injection. When the sensor detects a high input, it means that the voltage signal it is receiving is above the normal range, which can lead to inaccurate readings and affect the engine's performance.

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

Common Causes of P0338 Mercedes-Benz

  1. Faulty crankshaft position sensor
  2. Damaged wiring or connectors in the sensor circuit
  3. Issues with the engine control module
  4. Electrical interference or shorts in the sensor circuit
  5. Improper installation or mounting of the sensor

Symptoms of P0338 Mercedes-Benz

  1. Rough idling
  2. Stalling
  3. Difficulty starting the engine
  4. Decreased fuel efficiency
  5. Engine misfires

How to Fix P0338 Mercedes-Benz

  1. Begin by diagnosing the issue using a diagnostic scanner to retrieve the fault code and inspect the crankshaft position sensor circuit.
  2. Test the crankshaft position sensor using a multimeter to check for proper voltage and resistance readings.
  3. Inspect the wiring and connectors for any signs of damage or corrosion, repairing or replacing as necessary.
  4. Clear the fault code from the engine control module after completing the repairs, and test drive the vehicle to ensure the issue has been resolved.
  5. If the problem persists, further diagnostic testing may be required to pinpoint the exact cause of the high input in the sensor circuit.

Cost to Fix P0338 Mercedes-Benz

The typical repair costs for addressing a high input in the crankshaft position sensor circuit can range from $150 to $300, including parts and labor. It is important to note that specific diagnosis time and labor rates at auto repair shops can vary, so it is advisable to obtain quotes from local shops for a more accurate estimate. Additionally, rates may be higher at dealerships or in metropolitan areas, while independent shops may offer more affordable pricing.

What does this mean?

Tech Notes for P0338 Mercedes-Benz

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 Mercedes-Benz code?

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

Need Help with the Code?

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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 Mercedes-Benz Code

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

The common symptoms include engine misfires, rough idling, stalling, difficulty starting the engine, and poor acceleration.

2. What are the possible causes of OBDII code P0338 in a Mercedes-Benz?

The code P0338 can be triggered by issues such as a faulty crankshaft position sensor, damaged wiring or connectors in the sensor circuit, or a problem with the engine control module.

3. How can a faulty crankshaft position sensor be diagnosed in a Mercedes-Benz with OBDII code P0338?

A technician can use a multimeter to test the resistance of the sensor, check for proper voltage supply to the sensor, and inspect the sensor for any physical damage or contamination.

4. What is the typical repair process for resolving OBDII code P0338 in a Mercedes-Benz?

The repair process usually involves replacing the faulty crankshaft position sensor, repairing any damaged wiring or connectors, and clearing the trouble codes from the engine control module.

5. Are there any DIY tips for addressing OBDII code P0338 in a Mercedes-Benz?

While it's recommended to have a professional diagnose and repair this issue, DIY enthusiasts with experience in automotive repair may attempt to replace the crankshaft position sensor themselves following manufacturer guidelines.

6. Can driving with OBDII code P0338 in a Mercedes-Benz cause further damage to the vehicle?

Continuing to drive with this code may lead to more severe engine performance issues, potential stalling or complete engine failure, so it's best to address the problem promptly.

7. How long does it typically take to repair OBDII code P0338 in a Mercedes-Benz?

The repair time can vary depending on the extent of the issue and the availability of parts, but it usually takes a few hours to replace the crankshaft position sensor and clear the trouble codes.

8. Is it safe to drive a Mercedes-Benz with OBDII code P0338 if the symptoms are not severe?

It is generally not recommended to drive the vehicle with this code present, as it can lead to unpredictable engine behavior and potentially unsafe driving conditions.

9. Can extreme weather conditions affect the triggering of OBDII code P0338 in a Mercedes-Benz?

Extreme temperatures or moisture can sometimes exacerbate issues with the crankshaft position sensor or its circuit, leading to the triggering of code P0338 in a Mercedes-Benz.

10. What is the cost range for repairing OBDII code P0338 in a Mercedes-Benz at a repair shop?

The cost of repairing this issue can vary depending on the labor rates of the repair shop, the cost of parts, and any additional repairs needed, but it typically ranges from $200 to $500.

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