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JFN1
JFN1, ASE Certified Technician
Category: Transmissions
Satisfied Customers: 4450
Experience:  ASE Master Technician ASE L1 Certified Technician
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Al l I did is change trans Filter And gasket and now have

Customer Question

Al l I did is change trans Filter And gasket and now have code po700 And it wont go in reverse
JA: Thanks. Can you give me any more details about your issue?
Customer: DAryl
JA: OK got it. Last thing — Chevy Mechanics generally expect a deposit of about $18 to help with your type of question (you only pay if satisfied). Now I'm going to take you to a page to place a secure deposit with JustAnswer. Don't worry, this chat is saved. After that, we will finish helping you.
Submitted: 11 months ago.
Category: Transmissions
Expert:  JFN1 replied 11 months ago.

Year and model of your Chevrolet?

Customer: replied 11 months ago.
2004 GMC 2500 HD LLY 6.6 77000 mi.
Expert:  JFN1 replied 11 months ago.

OK. Allison transmissions do not tolerate this very well, and you'll usually get a transmission code immediately after having the pan off.

Clear the transmission DTC's and try again.

Customer: replied 11 months ago.
I did not Only that but but it said range shift inhibited when put in reverse. It works in all forward positions. The pan I put on 2 years ago was ppe deep pan all I did was drop same pan put new gasket and filter and new fluid Mobil 1.
Customer: replied 11 months ago.
Posted by JustAnswer at customer's request) Hello. I would like to request the following Expert Service(s) from you: Live Phone Call. Let me know if you need more information, or send me the service offer(s) so we can proceed.
Customer: replied 11 months ago.
Expert:  JFN1 replied 11 months ago.

If you have that message, you have transmission trouble codes. What are they?

Customer: replied 11 months ago.
po700
Expert:  JFN1 replied 11 months ago.

That is an ECM code, you need to access the TCM (transmission control module) and retrieve the codes from there.

Customer: replied 11 months ago.
how do I do that
Customer: replied 11 months ago.
IT said range shift inhibited
Customer: replied 11 months ago.
only in reverse
Expert:  JFN1 replied 11 months ago.

You need a scan tool that will read TCM data. A "code reader" will not do this. You need a better scan tool, or to refer it to a repair shop that has one. Clearing the TCM codes will generally make this problem go away. Even if it doesn't, you need some TCM diagnostic data to determine what it going on, and you don't have access to it with the tool you have.

Customer: replied 11 months ago.
Didn't help
Expert:  JFN1 replied 11 months ago.

What TCM codes are there? You have TCM codes, if you have that message, we have to know what the TCM codes are.

Customer: replied 11 months ago.
Wiring harness chaffed
Expert:  JFN1 replied 11 months ago.

Is it fixed?

Customer: replied 11 months ago.
Expert:  JFN1 replied 11 months ago.

Very good. Wire chafed inside the pan or where?

Expert:  JFN1 replied 11 months ago.

Did you get this worked out? Wanted to follow up and make sure you got what you needed from me.

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