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I seem to be having a big of trouble with a code that popped…

Customer Question
Hello I seem to...

Hello I seem to be having a big of trouble with a code that popped up after fixing the others

Mechanic's Assistant: Where exactly do you think the noise is coming from? And how long has this been going on?

It’s not a noise, the truck neutralizes itself trying to go into 5th gear

Mechanic's Assistant: What is the model/year of your Chevy?

2001 Silverado 2500 duramax

Mechanic's Assistant: Are you fixing your Silverado yourself? What have you tried so far?

Before the truck was having a large fuel leak code and would basically go into limo mode when towing so I did research and changed the CP3 with a modified hi flow one from fleece. I got it in and had to tune it because the cp3 used a lbz/lmm FPR well all in all all the codes are gone and it’s an animal. Now I’m getting a p0735 code

Mechanic's Assistant: Anything else you want the mechanic to know before I connect you?

You can cruise but in 4th if you try to give it more gas for example in an uphill it will go into neutral and stay in 4th no matter what unless I erase the DTC

Submitted: 4 months ago.Category: Chevy
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Answered in 1 minute by:
3/7/2018
Chevy Mechanic: GM Tech (Cam), Chevy Technician replied 4 months ago
GM Tech (Cam)
GM Tech (Cam), Chevy Technician
Category: Chevy
Satisfied Customers: 30,400
Experience: GM Grand Master Technician 2007. 14 years experience.
Verified

Hello there, I am Cam.

I am Licensed technician at a GM dealership with more than 16 years experience. 
Like you, I am a user of this website and as such, any billing questions should be sent to customer service.

I ask that you please provide details and communicate with me so we can make your experience here worth 5 stars! I am around most days but not every minute of every day. If you reply while I am offline, I will respond when I am next online. 

I am reviewing your request and will post in a moment.

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Chevy Mechanic: GM Tech (Cam), Chevy Technician replied 4 months ago

Ok so that code sets when the computer sees a different ratio for 5th gear than what it expects. This could be set due to a slipping condition in the transmission, bad transfer case with worn parts causing erratic reading on the vehicle speed sensor, bad vehicle speed sensor or even bad wiring. last it could be a problem with valves in the valve body but that would also cause a slipping condition.
Given that it has all this power now I am really thinking its a transmission slipping issue.
For this then I suggest a reputable transmission shop if you are not looking to do the work yourself.

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