Engine-Codes - Jeep - P1521 JEEP

P1521 JEEP - Incorrect Engine Oil Type

Repair Importance Level: 3/3
Repair Difficulty Level: 2/3  What is this?
Table of contents

P1521 JEEP Possible Causes

  • Incorrect engine oil viscosity
  • Incorrect oil type
  • Oil contamination
  • Faulty Engine Oil Pressure Sensor
  • Reprogram Powertrain Control Module (PCM)

How is the P1521 JEEP code repair?

Start by checking the "Possible Causes" listed above. Visually inspect the related wiring harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector's pins.

Tech Notes

This Diagnostic Trouble Code (DTC) may set in high ambient temperature conditions when the correct oil type (viscosity) is being used in the Engine. If correct oil viscosity is used, but the code keeps coming back, reprogramming (refreshing) the Powertrain Control Module (PCM) will take care of the problem.

What is the cost to diagnose the P1521 JEEP code

Labor: 1.0

The cost to diagnose the P1521 JEEP code is 1.0 hour of labor. The auto repair labor rates vary widely across the country, and even within the same city. Most auto repairs shops charge between $75 and $150 per hour.
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Possible Symptoms

  • Engine Light ON (or Service Engine Soon Warning Light)

P1521 JEEP Meaning

Using the oil pressure, oil temperature and other vital engine inputs the Powertrain Control Module (PCM) can determine the engine oil viscosity. Incorrect viscosity will affect the operation of the MDS by delaying cylinder activation. The Diagnostic Trouble Code (DTC) will set when the PCM has detected an incorrect engine oil viscosity.

More Information

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