Code p01521, incorrect oil type?

PRINCESSLION

MEMBER
2006 DODGE RAM
5.7L
V8
4WD
AUTOMATIC
133,000 MILES

I have a code p01521 incorrect oil type. Check engine light is not on. I did oil change with right viscosity 5w20, code came back. No other codes.

Saturday, November 16th, 2024 AT 11:39 AM

2 Replies

JACOBANDNICKOLAS

MECHANIC
109,724 POSTS

Hi,

Using the oil pressure, oil temperature and other vital engine inputs the PCM can determine the engine oil viscosity. Incorrect viscosity will affect the operation of the MDS by delaying cylinder activation.

This is usually only caused by oil contamination, low pressure, dirty oil, or the wrong viscosity.

Did this just start after the oil was changed? How long did it take for the code to return? Also, have you checked to make sure the engine oil pressure is within spec? And don't laugh, but what brand oil filter was used? Some allow oil to be filtered too easily, lowering the pressure. It's just a thought at this point.

Let me know.

Take care,

joe

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Saturday, November 16th, 2024 AT 7:26 PM

PRINCESSLION

MEMBER
2 POSTS

The code was there before I changed the oil. The oil pressure seems okay, it's after 12 o'clock at idle on the dash gauge.
The old oil was very dirty, low and thick. The code returned right away. After I deleted the codes, I drove the car a little bit, after that I turned off the engine I checked, the code came back. I have now two pending code both are p1521.
I used Oreilly's filter MicroGard Oil Filter - MGL51085. And Walmart supertech synthetic blend brand.
So, when the code is triggered? Is it when the oil viscosity is thicker than 5w20 or thinner?

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Sunday, November 17th, 2024 AT 5:36 AM