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Engine-Codes – GMC – P0339 GMC

P0339 GMC Code - Crankshaft Position Sensor Circuit Intermittent

Quick Answer

The P0339 diagnostic trouble code (DTC) for GMC vehicles refers to a fault in the crankshaft position sensor circuit that is intermittent. Common causes include Faulty crankshaft position sensor, Wiring harness issues (e.g., short circuits, open circuits), Poor electrical connections. 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
P0339 GMC indicates Crankshaft Position Sensor Circuit Intermittent.
Common causes
Common causes include Faulty crankshaft position sensor, Wiring harness issues (e.g., short circuits, open circuits), Poor electrical connections.
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 P0339 GMC Description

The P0339 diagnostic trouble code (DTC) for GMC vehicles refers to a fault in the crankshaft position sensor circuit that is intermittent. The crankshaft position sensor is a vital component in the engine management system, as it monitors the position and rotational speed of the crankshaft. This information is crucial for the engine control module (ECM) to accurately time the ignition and fuel injection sequences.

OBDII Code P0339 GMC - Crankshaft Position Sensor Circuit Intermittent
P0339 GMC Code - Crankshaft Position Sensor Circuit Intermittent

Common Causes of P0339 GMC

  1. Faulty crankshaft position sensor
  2. Wiring harness issues (e.g., short circuits, open circuits)
  3. Poor electrical connections
  4. Mechanical faults in the crankshaft
  5. ECM software or hardware issues

Symptoms of P0339 GMC

  1. Rough idling or engine stalling
  2. Engine misfires
  3. Difficulty starting the vehicle
  4. Reduced fuel efficiency
  5. Check Engine Light illuminated on the dashboard

How to Fix P0339 GMC

  1. Begin by diagnosing the specific cause of the intermittent circuit fault using a scan tool to read the DTC and live data.
  2. Inspect the wiring harness for any visible damage or loose connections. Repair or replace any damaged wiring.
  3. Test the crankshaft position sensor using a multimeter to ensure it is functioning correctly. Replace the sensor if necessary.
  4. Clear the DTC and perform a test drive to verify that the issue has been resolved.
  5. If the problem persists, further diagnosis may be required to identify any underlying ECM or mechanical issues.

Cost to Fix P0339 GMC

The typical repair costs for addressing a P0339 GMC code can range from $100 to $300, depending on the specific cause of the issue and the cost of parts involved. This estimate includes the cost of a new crankshaft position sensor, wiring repairs, and labor costs. It is important to note that diagnostic time and labor rates can vary, so it is advisable to consult with a local auto repair shop for a more accurate estimate based on your vehicle make and model.

When is the Code Detected?

The crankshaft position sensor (POS) signal is not detected by the Powertrain Control Module (PCM) at times

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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 P0339 GMC Code

1. What are the common symptoms of OBDII code P0339 GMC (Crankshaft Position Sensor Circuit Intermittent)?

- Common symptoms include rough idling, stalling, engine misfires, difficulty starting the vehicle, and a decrease in fuel efficiency.

2. What are the possible causes of OBDII code P0339 GMC?

- The code P0339 GMC can be caused by a faulty crankshaft position sensor, damaged wiring or connectors related to the sensor, or issues with the sensor's alignment.

3. How can I diagnose the cause of OBDII code P0339 GMC?

- To diagnose the cause of the code, you can perform a visual inspection of the sensor and its wiring, use a multimeter to test the sensor's voltage and resistance, and check the sensor's alignment with the crankshaft.

4. Can a faulty crankshaft position sensor cause other issues besides triggering OBDII code P0339 GMC?

- Yes, a faulty crankshaft position sensor can cause a variety of issues such as poor engine performance, erratic engine timing, and even prevent the vehicle from starting.

5. How can I repair OBDII code P0339 GMC?

- Repairing the code involves replacing the faulty crankshaft position sensor, repairing or replacing damaged wiring or connectors, and ensuring proper alignment of the sensor.

6. Is it safe to continue driving with OBDII code P0339 GMC present?

- It is not recommended to continue driving with the code present, as it can lead to further engine problems and potential breakdowns.

7. Can a DIY enthusiast repair OBDII code P0339 GMC, or should I take it to a professional mechanic?

- While some DIY enthusiasts may have the skills to replace the crankshaft position sensor, it is recommended to consult a professional mechanic for accurate diagnosis and repair of the code.

8. How much does it typically cost to repair OBDII code P0339 GMC at a repair shop?

- The cost of repairing the code can vary depending on the labor rates and parts costs, but it typically ranges from $150 to $300 at a repair shop.

9. Are there any preventive measures to avoid OBDII code P0339 GMC in the future?

- Regular maintenance of the vehicle, including checking the condition of the crankshaft position sensor and its wiring, can help prevent the occurrence of the code in the future.

10. Can a weak battery or alternator cause OBDII code P0339 GMC to appear?

- Yes, a weak battery or alternator can cause voltage fluctuations that may trigger the code P0339 GMC. It is recommended to ensure the battery and charging system are in good condition when diagnosing this code.

Discuss the causes and fixes for P0339 GMC OBDII Code

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  • Hi, I need help on my 2000 GMC Safai van, I tryed many different machanic shops and no one can solve the problem, codes appear are: P0339, P1345, I replaced Crankshaft sensor, camshaft sensor, ignition coil, and distribuitor, airflow sensor... engine start, but once is running for a while start failing, this get worse with moisture (raining day), the incredible thing is, if I let the van by 24 hours parked, next time the car start and check engine desapear, any one had the same problem?, thank you very much. Erick

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