AutoCodes – RAM – P1239 RAM

P1239 RAM Code - Engine Oil Temperature Too Low

Quick Answer

The Engine Oil Temperature (EOT) Sensor is a variable resistor that measures the temperature of the engine oil. Common causes include Engine Oil, Faulty Engine Oil Temperature Sensor, Engine Oil Temperature Sensor harness is open or shorted. 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 Engine Oil, Faulty Engine Oil Temperature Sensor, Engine Oil Temperature Sensor harness is open or shorted.
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.

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Code Popularity 1,739

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on Jun 29, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P1239 RAM Description

The Engine Oil Temperature (EOT) Sensor is a variable resistor that measures the temperature of the engine oil. The Powertrain Control Module (PCM) supplies a 5-Volt reference and a ground to the sensors low reference signal circuit. When the oil temperature is low, the sensor resistance is high. When the oil temperature is high, the sensor resistance is low. The Diagnostic Trouble Code (DTC) P1239 is set when the Engine Oil temperature rises slower than a calibrated modeled temperature. When the actual oil temperature falls below the low boundary of the calibrated modeled temperature for three minutes the fault is set. Two trip fault. Three good trips to turn off the MIL.

OBDII Code P1239 RAM - Engine Oil Temperature Too Low - AutoCodes.com — P1239 RAM Code - Engine Oil Temperature Too Low

What does this mean?

What are the Possible Causes of the DTC P1239 RAM?

Engine Oil
Faulty Engine Oil Temperature Sensor
Engine Oil Temperature Sensor harness is open or shorted
Engine Oil Temperature Sensor circuit poor electrical connection
Faulty Powertrain Control Module (PCM)

How to Fix the DTC P1239 RAM?

Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P1239 RAM code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.

Need more information about the P1239 RAM code?

Need more information on how to fix the P1239 RAM code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P1239 RAM code diagnosed by a professional: Find a repair shop in your area

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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