68RFE issue

[Bbaily]

My transmission guy and I are stumped...I recently purchased a 2008 3500 with a 68RFE ... it was slipping pretty bad about a week after I bought it and going into limp mode every time it was driven . Took to my trans guy and he found the fluid looked pretty bad with metal flake and further investigation determined that a rebuild was necessary. After rebuild including a TopLine tc there is still a problem...runs and shifts great for about 4-5 miles after initial startup in the am or maybe a little more and then it does the 1st-4th limp in.... constantly throws a P0871 and once a P0934 which I believe is a line pressure issue. He has looked at the connectors twice and replaced the solenoid pack with new twice and well as the line pressure sensor twice with new...any info from you pros would be greatly appreciated! Thanks in advance!!!

 

[transe]

Did they replace the valve body (not just the solenoid)? P0871 in a 2007-2009 truck is usually due to a worn Solenoid Switch Valve (SSV) bore in the main valve body.

 

[Ozymandias]

Does the 68 not need something like a relearn process done with wiTech?

 

[Bbaily]

Did they replace the valve body (not just the solenoid)? P0871 in a 2007-2009 truck is usually due to a worn Solenoid Switch Valve (SSV) bore in the main valve body.[/I’m not certain... I have a call in to him to ask that very question after reading many more of your replies to others with the same problem. Thank you for your reply and I’ll get back as soon as I find out!

 

[Ozymandias]

Found something...

 

[Bbaily]

Found something...

Very good and thank you! I know he did perform the quick learn but doubt he did the drive learn...I’ll have that discussion with him in the am!

 

[transe]

Just FYI, the drive learn is NOT required after a quicklearn (although it can be done if desired). The quicklearn is designed to re-learn all the CVIs and other adaptive values, to provide a reasonable calibration following a repair or overhaul. The drive learn is typically used to fine-tune one of the CVIs (if a customer is experiencing a shift complaint with one particular shift event, such as 3-4 upshift).

 

[Bbaily]

Just FYI, the drive learn is NOT required after a quicklearn (although it can be done if desired). The quicklearn is designed to re-learn all the CVIs and other adaptive values, to provide a reasonable calibration following a repair or overhaul. The drive learn is typically used to fine-tune one of the CVIs (if a customer is experiencing a shift complaint with one particular shift event, such as 3-4 upshift).

Ok and thank you...looks like a probable expensive valve body replacement may happen soon tho. I’d bet he did not replace that when he did the rebuild. I’ve also seen reasonably priced oversized SSV but it requires another set of tools . And apparently it involves making the SSV bore bigger...probably better off just replacing the valve body.

 

[Bbaily]

So a warped valve body is what it looks like...new one going in tomorrow!

 

[RDThompson]

Did they replace the valve body (not just the solenoid)? P0871 in a 2007-2009 truck is usually due to a worn Solenoid Switch Valve (SSV) bore in the main valve body.

If you change the valve body yourself, will it drive so you can get somewhere to get the quicklearn done?

 

[transe]

If you change the valve body yourself, will it drive so you can get somewhere to get the quicklearn done?

Yes, you can drive the truck GENTLY after replacing the VB, in order to get to a shop or dealer to have a quicklearn done.

 

[Bbaily]

If you change the valve body yourself, will it drive so you can get somewhere to get the quicklearn done?

I did not change it myself the transmission buddy I have did it and then the quick learn and it has been fine since.

 

[RDThompson]

Yes, you can drive the truck GENTLY after replacing the VB, in order to get to a shop or dealer to have a quicklearn done.

Thanks, I appreciate the help.