AutoCodes – Jeep – P1239 Jeep

P1239 Jeep 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 Jeep 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 18,147

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
Comments
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Code P1239 Jeep 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 Jeep - Engine Oil Temperature Too Low - AutoCodes.com — P1239 Jeep Code - Engine Oil Temperature Too Low

What does this mean?

What are the Possible Causes of the DTC P1239 Jeep?

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 Jeep?

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 Jeep 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 Jeep 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.