Transmissions

Have Transmission Questions? Ask a Mechanic for Answers ASAP

Ask an Expert,
Get an Answer ASAP!

Transmissions

I just put a new 6L80 transmission in my truck new motor

Customer Question
also. My PRNDM indicator lights...
I just put a new 6L80 transmission in my truck new motor also. My PRNDM indicator lights up but the selector doesn't move. It goes into D and R.
JA: Do you have the trouble code? Do you have a code reader or scan tool?
Customer: I do I had a P0602 and a P0700, also a U0121 I believe, I get the messages service trailer brake system and service stabilitrack. I just programmed the ecm and the tcm. The codes are gone after I reset. (In the process of rebuilding the truck)
JA: I'll pass this info along to the Chevy Mechanic so that he can get you a quick fix. What is the model/year of your Chevy?
Customer: 2009 Silverado LTZ 1500 4x4, New wiring harness was also installed, I'm just heading out for an hour or so. email is***@******.***
JA: Are you fixing your Silverado yourself? What have you tried so far?
Customer: Basically it had 280000 miles on it and I had plans to rebuild, it had a 6.0l gas. One Monday after the truck sat for the weekend. I had shift issues and noises coming from the trans, it was fine when I parked it. So I tore into the truck putting in a crate engine and a gm rebuild transmission, with a new gm wiring harness. I used HP Tuners pro to program the ECM to disable the DOD and variable cam the LS3 6.2l I installed doesn't have those, the engine runs great. The trans won't go into fast learn either. I am just waiting for the rear wiring harness, I'll install that then it will likely head to the dealership to see whats up. I know I have ABS/Stabilitrak/Trailer brake system issues, would this cause the trans not to program properly?
JA: Anything else you want the mechanic to know before I connect you?
Customer: Thats about it. The harness isn't here till mid week, if I could be pointed in the place to look I would look. I have the factory manual, but I'm not real keen on the time it would take to trouble shoot the lan networks. But if pointed in a direction I would go into some tests over the weekend.
Submitted: 1 year ago.Category: Transmissions
Show More
Show Less
Ask Your Own Transmissions Question
Answered in 4 hours by:
12/31/2016
Transmission Mechanic: Chris (aka- Moose), Technician replied 1 year ago
Chris (aka- Moose)
Chris (aka- Moose), Technician
Category: Transmissions
Satisfied Customers: 1,795
Experience: 16 yrs. experience with auto, manual, & CVT drivelines
Verified

Welcome, I'm Chris (aka Moose), my normal schedule online is around lunch and after dinner till early morning.

Do all gears work even though the the indicator does not change?

Ask Your Own Transmissions Question
Customer reply replied 1 year ago
I'll take it for a drive today and see. A little more info-the speedo on the dash works but the one through the scan tool does not. What time zone are you in
Customer reply replied 1 year ago
I haven't been able to perform the fast learn procedure also.
Customer reply replied 1 year ago
It won't shift. -service stabilitrak-service traction control- are the messages I'm getting.
Customer reply replied 1 year ago
These are also in my scanner;
C1235 - RR wheel sensor its new
P0010- is not supposed to report
P0454- is a new pump with a switch
P3401- is not supposed to report either. DOD has been disabled, Variable cam had none selected, and errors from them are not supposed to report.
Transmission Mechanic: Chris (aka- Moose), Technician replied 1 year ago

Central time.

No transmission codes.

So you select drive, and accelerate up through 1st gear but it does not shift to 2nd?

Does reverse work?

Ask Your Own Transmissions Question
Customer reply replied 1 year ago
Goes in reverse and it works. No shifts, feels like may be in 2nd.
Transmission Mechanic: Chris (aka- Moose), Technician replied 1 year ago

Does the computer show the correct gear position when you shift through each gear?

If needed are you planning to overhaul this new transmission?

Ask Your Own Transmissions Question
Customer reply replied 1 year ago
The trans is new from GM. I can't get into the fast learn mode, or see anything from the PCM/ECM
Transmission Mechanic: Chris (aka- Moose), Technician replied 1 year ago

Are you saying the PCM shows no signal from the park neutral position switch on a scan tool?

Ask Your Own Transmissions Question
Customer reply replied 1 year ago
but I'm using hp tuners pro, I'm not all that familiar with it.
Transmission Mechanic: Chris (aka- Moose), Technician replied 1 year ago

Is that a scan tool or a programmer that makes the truck have more power?

Ask Your Own Transmissions Question
Customer reply replied 1 year ago
It lets you in the program to make changes. I needed to get in to disable the Variable cam and the DOD to get the ls3 to run off the stock ecm.
Customer reply replied 1 year ago
I had a junkyard computer I put in and sync d the vats. Same issue.
Transmission Mechanic: Chris (aka- Moose), Technician replied 1 year ago

I do not believe I can figure this one out not in person. Opting out now.

Ask Your Own Transmissions Question
Customer reply replied 1 year ago
K but if I have codes (i do) can the tcm be programmed?
Transmission Mechanic: Tim's Auto Repair, Mechanic replied 1 year ago
Tim's Auto Repair
Category: Transmissions
Satisfied Customers: 16,171
Experience: I have been rebuilding automatic transmissions for 25 years
Verified

Hi, My name is ***** ***** for the delay.

I will do my best to assist you.

does the PRND321 ever not light up?

why did you replace the transmission?

Ask Your Own Transmissions Question
Customer reply replied 1 year ago
It lights up it's the 6spd. The truck had 280000miles on it. And it did the same thing stopped shifting etc. I think it's a limp mode. Anyway figured it was time to replace everything anyway. New trans motor and wiring harness. When the trouble started I went through a field of canola stubble. It hit the harness pretty hard at the brake module, this harness I did not replace. So I just need to know if the service codes are on the dash, that my tuner/scanner can't see would that stop my tcm from being programmed
Customer reply replied 1 year ago
Replaced trans because of milage. Same problem there with new trans. Plan is to replace harness; if that doesn't fix it; take to GM. But I'd like some direction before I take it in
Customer reply replied 1 year ago
I did see the selector move on my scanner, park, reverse, neutral, D6, and D5 manual
Ask Chris (aka- Moose) Your Own Question
Chris (aka- Moose)
Chris (aka- Moose)
Chris (aka- Moose), Technician
Category: Transmissions
Satisfied Customers: 1,795
1,795 Satisfied Customers
Experience: 16 yrs. experience with auto, manual, & CVT drivelines

Chris (aka- Moose) is online now

A new question is answered every 9 seconds

How JustAnswer works:

  • Ask an ExpertExperts are full of valuable knowledge and are ready to help with any question. Credentials confirmed by a Fortune 500 verification firm.
  • Get a Professional AnswerVia email, text message, or notification as you wait on our site. Ask follow up questions if you need to.
  • 100% Satisfaction GuaranteeRate the answer you receive.

JustAnswer in the News:

Ask-a-doc Web sites: If you've got a quick question, you can try to get an answer from sites that say they have various specialists on hand to give quick answers... Justanswer.com.
JustAnswer.com...has seen a spike since October in legal questions from readers about layoffs, unemployment and severance.
Web sites like justanswer.com/legal
...leave nothing to chance.
Traffic on JustAnswer rose 14 percent...and had nearly 400,000 page views in 30 days...inquiries related to stress, high blood pressure, drinking and heart pain jumped 33 percent.
Tory Johnson, GMA Workplace Contributor, discusses work-from-home jobs, such as JustAnswer in which verified Experts answer people’s questions.
I will tell you that...the things you have to go through to be an Expert are quite rigorous.

What Customers are Saying:

I would (and have) recommend your site to others I was quite satisfied with the quality of the information received, the professional with whom I interacted, and the quick response time. Thanks, and be sure that I'll be back whenever I need a question answered in a hurry.

Stephanie PElm City, NC

used your service this weekend with "Trecers" help. thank you ,thank you, thank you. replaced an A/C fan motor. Local Auto Zone had part. $15.00 "tracer" fee and $40.00 for parts, I saved several hundreds of dollers at a shop. i will recommend you and use you in the future.

David L.Richmond, TX

9 dollars, 2 hours of my time, and I drove away. Your diagnosis was right on the mark. Thank you so much.

PhilMarysville, CA

Lurch. Thank you very much. I had real doubts about this website but your promptness of response, quick followup and to the point answer with picture was incredible.

CharlesWalnut Creek, CA

As a single woman, I really appreciate an excellent and affordable opinion.
Thank you Geordie, I will not hesitate to contact justanswer in the future!

SueCharleston, WV

Another great insight to what may be the problem. I will have my mechanic take a look at it tomorrow. Thanks again, Frank...you do indeed know your stuff.

JimCastleberry, FL

Wonderful service, prompt, efficient, and accurate. Couldn't have asked for more. I cannot thank you enough for your help.

Mary C.Freshfield, Liverpool, UK

< Previous | Next >

Meet the Experts:

Chris (aka- Moose)

Chris (aka- Moose)

Technician

1,795 satisfied customers

16 yrs. experience with auto, manual, & CVT drivelines

Tim&#039;s Auto Repair

Tim's Auto Repair

Mechanic

16,171 satisfied customers

I have been rebuilding automatic transmissions for 25 years

Gary

Gary

ASE Certified Technician

396 satisfied customers

25 years GM master tech

Mike Kelly

Mike Kelly

ASE Certified Technician

150 satisfied customers

17 years experience as an auto mechanic, foreign and domestic. 5 years running my own repair business.

Matt

Matt

Engineer

134 satisfied customers

Mechanical Engineer BEng Hons22 years experience in car engine industry, 10 years in formula 1

Dave Nova

Dave Nova

ASE Certified Tech

98 satisfied customers

ASE Master Certification. 25 yrs experience

John Mc

John Mc

Trans specialist

93 satisfied customers

Transmission dealer tech for over 19 years

< Previous | Next >

Related Transmissions Questions
My transmission is showing the same 3 codes. I think it is
Hi my transmission is showing the same 3 codes. I think it is in lock down ie full hydraulic pressure with 2nd and rev only working. It shifts very harshly from 2nd to reverse with a heavy clunk. The … read more
Cesar Jimenez
Cesar Jimenez
Owner/CEO
Vocational, Technical or Trade School
106 satisfied customers
2005 Corolla. I can rev engine normally when in neutral, but
2005 Corolla. I can rev engine normally when in neutral, but put it in drive and the engine continues to run, but there is no power at all. I can toy with the gas pedal and make it go reluctantly on l… read more
Matt
Matt
Engineer
Bachelor's Degree
134 satisfied customers
You Nissan Pintara 2011 Automatic - a large thump when
You Nissan Pintara 2011 Automatic - a large thump when accelerating hard from a standstill. Otherwise gears seem ok. … read more
Edward Clayton
Edward Clayton
Associate Degree
1,033 satisfied customers
2008 saturn vue engine 2.4 Transmission 4t45e do y have a
2008 saturn vue engine 2.4 Transmission 4t45e do y have a codes from transmission but is cold dont engage any speed inútil normal temperatura and then The transmission works normal… read more
Chris (aka- Moose)
Chris (aka- Moose)
Technician
1,795 satisfied customers
F f150 2000 fails out of gear at stop lights and I need to
F f150 2000 fails out of gear at stop lights and I need to rev engine a little to get it to go back into gear is this a pressure solenoid ? … read more
Expert
Expert
15 satisfied customers
It doesn't go into reverse right away. 2010 equinox. I
I haven't done anything, I was going to check the fluid level … read more
kwiggins29059
kwiggins29059
Associate Degree
219 satisfied customers
The transmission will go fine in reverse, but will not go
The transmission will go fine in reverse, but will not go forward in drive … read more
vwtech0405
vwtech0405
VW Technician
Associate Degree
8,868 satisfied customers
How do you remove transmission from a 2001 Lincoln ls v8
how do you remove transmission from a 2001 Lincoln ls v8 … read more
Chris (aka- Moose)
Chris (aka- Moose)
Technician
1,795 satisfied customers
I have a 2006 dodge 1500 SLT 5.7 Hemi auto transmission,
I have a 2006 dodge 1500 SLT 5.7 Hemi auto transmission, when I shift to drive and accelerate it is normal then it bumps into higher gear and immediately disconnects and the engine revs and goes nowhe… read more
sprinkles08
sprinkles08
Technician
High School or GED
11 satisfied customers
I have a 2009 Ford F-150 with a 5.4L engine. The
I have a 2009 Ford F-150 with a 5.4L engine. The transmission was serviced at 55,0000 miles. When it was returned i notice transmission fluid leaking on the carport. I called the service department to… read more
kalamykid
kalamykid
Pactor automotive
Vocational, Technical or Trade Scho
97 satisfied customers
My 4wd quite working on my 1998 Chevy Blazer - the 3 push
My 4wd quite working on my 1998 Chevy Blazer - the 3 push buttons 2WD 4HI 4LO are not lite up. I have removed the battey and the battery tray and found the vacum pump. The cable that the diaphram actu… read more
Todd Audette
Todd Audette
Automotive Technician
Vocational High School
138 satisfied customers
I have a 4 WD 1998 S-10 Blazer that recently has been
I have a 4 WD 1998 S-10 Blazer that recently has been appearing to drop into neutral at 1500 rpms. when transmission typically shifts to third gear. … read more
kalamykid
kalamykid
Pactor automotive
Vocational, Technical or Trade Scho
97 satisfied customers
Toyota mr2 2004 Sequential trans. Sometimes will not do
Toyota mr2 2004 Sequential trans. Sometimes will not do anything when starting - in neutral & brake depressed. … read more
AMEDEE
AMEDEE
AUTOMOTIVE TECHNICIAN
Vocational, Technical or Trade Scho
9,105 satisfied customers
I have a 2005 3500 4x4 dually. The4H works just fine but the
I have a 2005 3500 4x4 dually. The*****4H works just fine but the 4L does not engage. The 4L light just flashes. Any thoughts? … read more
Tim&#039;s Auto Repair
Tim's Auto Repair
Mechanic
16,171 satisfied customers
2007 expedition 2wd. Transmission not shifting properly and
2007 expedition 2wd. Transmission not shifting properly and seems to slip when starting out in forward or reverse. Truck ran great until the other day when we had warm wet conditions then had sub free… read more
HDGENE
HDGENE
Master Technician/Lead Technician
Associate Degree
2,835 satisfied customers
2012 Traverse transmission feels like it is slipping but
2012 Traverse transmission feels like it is slipping but it's not, there is a hesitation between gears, going up or down. Not all the time, but mostly if there is a load on it. Was told it could be a … read more
Eric
Eric
Retired
N/A
14,436 satisfied customers
Transmission doesn't shift after getting battery changed in
transmission doesn't shift after getting battery changed in 2012 Silverado is this part of adaptive learning tranny … read more
Chad Farhat
Chad Farhat
Owner
Associate Degree
4,436 satisfied customers
I pulled the manual transmission out of my 2007 Mustang GT
I pulled the manual transmission out of my 2007 Mustang GT 4.6 liter. It's a Tremec TR3650 with 90K mies. After disassembling, it's clear that the teeth on the slider rings are severely worn and would… read more
Chris (aka- Moose)
Chris (aka- Moose)
Technician
1,795 satisfied customers
Disclaimer: Information in questions, answers, and other posts on this site ("Posts") comes from individual users, not JustAnswer; JustAnswer is not responsible for Posts. Posts are for general information, are not intended to substitute for informed professional advice (medical, legal, veterinary, financial, etc.), or to establish a professional-client relationship. The site and services are provided "as is" with no warranty or representations by JustAnswer regarding the qualifications of Experts. To see what credentials have been verified by a third-party service, please click on the "Verified" symbol in some Experts' profiles. JustAnswer is not intended or designed for EMERGENCY questions which should be directed immediately by telephone or in-person to qualified professionals.

Disclaimer: Information in questions, answers, and other posts on this site ("Posts") comes from individual users, not JustAnswer; JustAnswer is not responsible for Posts. Posts are for general information, are not intended to substitute for informed professional advice (medical, legal, veterinary, financial, etc.), or to establish a professional-client relationship. The site and services are provided "as is" with no warranty or representations by JustAnswer regarding the qualifications of Experts. To see what credentials have been verified by a third-party service, please click on the "Verified" symbol in some Experts' profiles. JustAnswer is not intended or designed for EMERGENCY questions which should be directed immediately by telephone or in-person to qualified professionals.

Show MoreShow Less

Ask Your Question

x