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Old 08-21-2010, 04:59 PM
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Trouble code question

Hey guys, I'm a newbe here. I just picked up a new to me 05 GC limited with a 5.7. I pulled the codes up. The only code I'm showing is a P1521. I've read two different code definitions. One shows it as "transmission engaged at high throttle angle" the other say's it's "Incorrect Engine Oil Type". I'm thinking the selling dealer probably just used their bulk 5w30-10w30. Thoughts? Thanks in advance.
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Old 08-21-2010, 05:54 PM
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Re: Trouble code question

i have a 2007 WK service manual:

P1521–INCORRECT ENGINE OIL TYPE


When Monitored:
Engine Running.

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


Possible Causes

INCORRECT ENGINE OIL TYPE

ENGINE OIL CONTAMINATION

ENGINE OIL
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Old 08-21-2010, 06:01 PM
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Re: Trouble code question

Cool, thank you.
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Old 08-21-2010, 06:06 PM
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Re: Trouble code question

also, i think your 05 when it came out was 5w30 then they had issues with the MDs and made it 5w20. then they realized 5w20 helped CAFE mileage standards and they said 'they ALL get 5w20'.
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