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P1239 RAM Code - Engine Oil Temperature Too Low

Quick Answer

The diagnostic trouble code (DTC) P1239 refers to an issue with the engine oil temperature being too low. Common causes include Faulty thermostat: A malfunctioning thermostat may not allow the engine oil to reach the proper operating temperature, Low oil level: Insufficient oil in the engine can prevent it from reaching the desired temperature, Coolant temperature sensor issues: Problems with the coolant temperature sensor can impact the engine oil temperature readings. 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
P1239 RAM indicates Engine Oil Temperature Too Low .
Common causes
Common causes include Faulty thermostat: A malfunctioning thermostat may not allow the engine oil to reach the proper operating temperature, Low oil level: Insufficient oil in the engine can prevent it from reaching the desired temperature, Coolant temperature sensor issues: Problems with the coolant temperature sensor can impact the engine oil temperature readings.
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 10, 2024
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Code P1239 RAM Description

The diagnostic trouble code (DTC) P1239 refers to an issue with the engine oil temperature being too low. This code typically indicates that the engine oil temperature is below the specified range, which can lead to various performance issues and potential long-term effects if not addressed promptly. Engine oil plays a crucial role in lubricating engine components, reducing friction, and dissipating heat. When the oil temperature is too low, it can result in increased wear and tear on engine parts, reduced fuel efficiency, and potentially even engine damage.

OBDII Code P1239 RAM - Engine Oil Temperature Too Low
P1239 RAM Code - Engine Oil Temperature Too Low

Common Causes of P1239 RAM

  1. Faulty thermostat: A malfunctioning thermostat may not allow the engine oil to reach the proper operating temperature.
  2. Low oil level: Insufficient oil in the engine can prevent it from reaching the desired temperature.
  3. Coolant temperature sensor issues: Problems with the coolant temperature sensor can impact the engine oil temperature readings.
  4. Coolant leak: A coolant leak can affect the overall temperature regulation of the engine, including the oil temperature.
  5. Engine oil viscosity: Using the wrong type of oil or oil with the incorrect viscosity rating can impact how quickly the oil heats up.

Symptoms of P1239 RAM

  1. Poor engine performance: The engine may run rough or have reduced power output due to the oil not reaching optimal operating temperature.
  2. Decreased fuel efficiency: Lower oil temperatures can lead to increased fuel consumption as the engine may run less efficiently.
  3. Cold start issues: The vehicle may have difficulty starting in cold weather conditions due to the low oil temperature affecting engine performance.
  4. Increased emissions: A low engine oil temperature can result in higher emissions output, potentially leading to a failed emissions test.

How to Fix P1239 RAM

  1. Check engine oil level: Ensure that the engine has the correct amount of oil and top up if necessary.
  2. Inspect thermostat: Test the thermostat to see if it is functioning correctly and replace it if necessary.
  3. Check coolant system: Inspect the coolant system for leaks and ensure that it is operating properly.
  4. Test coolant temperature sensor: Verify that the coolant temperature sensor is providing accurate readings and replace if needed.
  5. Monitor oil temperature: Monitor the engine oil temperature using a diagnostic tool to ensure it reaches the appropriate range.

Cost to Fix P1239 RAM

The cost of repairing a P1239 engine code can vary depending on the specific cause of the issue. In general, the cost of replacing a faulty thermostat can range from $150 to $300, while addressing coolant system leaks or sensor issues may cost between $200 to $500. Overall, the total repair cost for resolving an engine oil temperature issue can range from $200 to $800, including parts and labor. It's essential to consult with a qualified mechanic to diagnose the exact cause of the problem and obtain an accurate cost estimate for the necessary repairs.

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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 P1239 RAM Code

1. What does the OBDII code P1239 mean on a RAM vehicle?

P1239 indicates that the engine oil temperature is too low, which could affect proper engine performance and lubrication.

2. What are the common symptoms of the P1239 code?

Symptoms may include poor engine performance, reduced fuel efficiency, longer warm-up times, or the check engine light being illuminated.

3. What causes the P1239 code to appear?

Possible causes include a faulty engine oil temperature sensor, a stuck open thermostat, low ambient temperatures, or incorrect engine oil viscosity.

4. Can I continue driving with the P1239 code?

While it may be possible to drive, prolonged operation with low engine oil temperature can lead to poor lubrication and potential engine damage over time.

5. How do I diagnose the P1239 code on my RAM?

Start by checking the engine oil temperature sensor and its wiring, inspect the thermostat for proper operation, and ensure the correct engine oil is being used.

6. How do I fix the P1239 code?

Repairs may include replacing the engine oil temperature sensor, fixing wiring issues, replacing a faulty thermostat, or using the manufacturer-recommended engine oil.

7. Can cold weather trigger the P1239 code?

Yes, extreme cold weather can cause the engine oil temperature to remain low for an extended period, potentially triggering the code.

8. How much does it cost to fix the P1239 code?

Repair costs vary but typically range from $100 to $300 depending on whether the issue is with the sensor, thermostat, or other components.

9. Will resetting the code fix the P1239 issue?

Clearing the code may turn off the check engine light temporarily, but the underlying issue must be addressed to prevent the code from returning.

10. How can I prevent the P1239 code from occurring?

Regular maintenance, using the correct oil viscosity, and ensuring the cooling system components are functioning properly can help prevent this code.

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