G35 Sedan V35 2003-06 Discussion about the 1st Generation V35 G35 Sedan

G35 Code P0603 ,Transmission issues , Slips in drive

Old Oct 10, 2021 | 03:15 AM
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pvalli05's Avatar
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Infinity G35 Automatic 4 Door
G35 Code P0603 ,Transmission issues , Slips in drive

Just got a 2006 Infinity G35 with the code P0603 ,The cars transmission slips when in drive , (the engine will rev up to 2200 rpms then it will start accelerating slowly , seems like transmission is slipping , doesn't accurate or get up to speed much quicker if you pin the accelerator , engine just revs up) Reverse works perfectly no transmission slip at all , just in drive , rest of the car is in good shape , minus the cut straight piped exhaust , and hanging cut exhaust wire , any help would be appreciated , thanks in advance.
 
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Old Oct 10, 2021 | 07:27 AM
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Originally Posted by pvalli05
Just got a 2006 Infinity G35 with the code P0603 ,The cars transmission slips when in drive , (the engine will rev up to 2200 rpms then it will start accelerating slowly , seems like transmission is slipping , doesn't accurate or get up to speed much quicker if you pin the accelerator , engine just revs up) Reverse works perfectly no transmission slip at all , just in drive , rest of the car is in good shape , minus the cut straight piped exhaust , and hanging cut exhaust wire , any help would be appreciated , thanks in advance.
Welcome to the forum.

A search for the p0603 code can be found here..
https://www.nicoclub.com/service-man...F2006%2Fec.pdf

See page EC-497

Was this vehicle ever involved in a flood or damaged by water?

Good luck
 
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Old Oct 10, 2021 | 03:57 PM
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P0603 usually happens when you disconnect the battery.

Your transmission issue sounds like it's probably low on fluid, did you check the level?

You can check it cold to see if it's even on the dipstick but for ACTUAL fluid level it needs to be hot and run through each gear just like any other AT fluid check, if you're not sure how to check it look up a youtube video.
 
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