AutoCodes – RAM – P1521 RAM

P1521 RAM Code - Incorrect Engine Oil Type

Quick Answer

Using the oil pressure, oil temperature and other vital engine inputs the Powertrain Control Module (PCM) can determine the engine oil viscosity. Common causes include Incorrect engine oil viscosity, Incorrect oil type, Oil contamination. 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: P1521 RAM indicates Incorrect Engine Oil Type.
Common causes: Common causes include Incorrect engine oil viscosity, Incorrect oil type, Oil contamination.
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 1,444

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Intermediate (2 / 3)

What is this?

Table of contents Created and updated by William Orellana on Jul 07, 2020

Description
Possible Causes
How To Fix
Tech Notes
Cost to Diagnose
FAQs
Comments
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Code P1521 RAM Description

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.

OBDII Code P1521 RAM - Incorrect Engine Oil Type - AutoCodes.com — P1521 RAM Code - Incorrect Engine Oil Type

What does this mean?

What are the Possible Causes of the DTC P1521 RAM?

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

How to Fix the DTC P1521 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 does this mean?

Code 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 Code?

Labor: 1.0

To diagnose the P1521 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 P1521 RAM code?

Need more information on how to fix the P1521 RAM code? Get Access to Factory Service Manuals

Need Help with the 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.

Frequently Asked Questions about P1521 RAM Code

1. What are the common symptoms of OBDII code P1521 RAM - Incorrect Engine Oil Type?

The common symptoms of this code may include poor engine performance, rough idling, and illuminated check engine light.

2. What are the possible causes of OBDII code P1521 RAM - Incorrect Engine Oil Type?

Some possible causes of this code are using the wrong type of engine oil, a faulty oil pressure sensor, or issues with the oil pressure.

3. How can I diagnose OBDII code P1521 RAM - Incorrect Engine Oil Type?

Diagnosing this code typically involves checking the engine oil type and level, inspecting the oil pressure sensor, and performing a scan with an OBDII scanner.

4. Can using the incorrect engine oil trigger OBDII code P1521 RAM?

Yes, using the wrong type of engine oil can trigger this code as the engine may not be receiving proper lubrication or the correct oil pressure.

5. How can I repair OBDII code P1521 RAM - Incorrect Engine Oil Type?

Repairing this code usually involves draining the incorrect oil, replacing it with the manufacturer-recommended oil, checking the oil pressure sensor, and clearing the code with an OBDII scanner.

6. Is it safe to drive with OBDII code P1521 RAM - Incorrect Engine Oil Type active?

It is not recommended to drive with this code active as it can lead to potential engine damage due to inadequate lubrication or oil pressure.

7. Can a DIY enthusiast fix OBDII code P1521 RAM - Incorrect Engine Oil Type?

Depending on the root cause, a DIY enthusiast may be able to fix this code by changing the engine oil, inspecting the oil pressure sensor, and resetting the code with an OBDII scanner.

8. How often should I check my engine oil to prevent OBDII code P1521 RAM?

It is recommended to check your engine oil level and type regularly according to your vehicle's maintenance schedule to prevent triggering this code.

9. Will OBDII code P1521 RAM - Incorrect Engine Oil Type affect fuel efficiency?

Yes, this code can potentially affect fuel efficiency as the engine may not operate optimally with the incorrect oil type or pressure.

10. Can OBDII code P1521 RAM - Incorrect Engine Oil Type be a false alarm?

While rare, it is possible for this code to be triggered by a temporary issue or a faulty sensor, so it's advisable to diagnose and confirm the root cause before proceeding with repairs.