I have the hard shift from 3-4 in a xc70, I am pulling the motor, so now is a good time to get into the tranny if I need, but it seems my tranny is newer than the ones with B-4 shift issues, what should my approach to this transmission fix?
Tranny flush, am going to do lower tranny mount, but have service code #PO785
Hello, My name is XXXX XXX I am a Volvo dealership technician. I am going to try to help you with your question.
What is your VIN and what is the date code on the transmission?
Tranny code 02A
Thank you. I just wanted to verify the transmission is out of the range for the B4 cover
You did the transmission fluid flush to try to fix this? Or did the problem occur after the flush?
Service code set #PO785 earlier
After the flush
Okay, so you had a P0785 but it was shifting fine. Then you flushed it and now it shifts hard? Did you use the correct fluid?
Correct fluid was used then, & i will replace at time of motor swap, but I think its a shift solenoid...
One moment while I check some information I have on my home PC
Do you know if the software in the Transmission Control Module is up to date?
No, I live a distance from dealer, so it would be a trip to do, can a local tranny shop update?
No, not unless they have Volvo's diagnostic computer system and a subscription that allows software downloads
Sorry, no, not up to date.
That code is a generic code. I have some information that says it corresponds to a Volvo specific code TCM-0100, which is for general poor shift quality
However, I would like to verify that with more up to date information at work tomorrow if that is alright
Ok, so maybe an update after fluid flush & new mounts?
Yes, I can wait for a reply.
With any shift quality, if the fluid is full and clean (and correct- JWS3309 compatible), the first step is making sure the TCM is up to date. Also, the TCM monitors the age and temperature of the fluid constantly. Then it adapts shift pressures based on calculated wear
When the fluid is replaced, these values need to be reset
That, again, is a funciton of the dealer scanner
So, the dealer does the reset & update, what's that for labor?
Typical labor for a software update is 1 hour. They should reset the adaptives along with it, since they are already plugged in
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I apologize, my chat froze. If you did not get my last responce, it was:
"Typical labor for a software update is 1 hour. They should reset the adaptives along with it, since they are already plugged in"
You can still ask follow up questions here, it is just a little slower.
Okay I checked that code at work and it doesn't list a corresponding Volvo specific DTC. In that case, I would recommend starting with a software update (if necessary) and a reset of the fluid counters and adaption values. If you would like any additional information or have more questions please don't hesitate to ask. Please remember to only rate the service when you are 100% satisfied you have received all the information you need. If you feel the need to rate "Poor Service" or "Bad Service", please stop and reply to me via the REPLY TO EXPERT button with the issue you have. I will be happy to continue further and do everything I can to provide you with the service you seek.I am not credited for my time for a negative rating. Keep in mind, the correct answer may not be good news, but the rating is for the service. If I have helped you with your question, please give me an appropriate rating so that I receive credit for helping you. Even if you have a follow up question later, you can still come back to this question after you have rated the service.Thank you, Andy
Trained to diagnose and repair Volvo transmission problems