'09 Sonata (I4 GLS) Transmission Jerks while downshifting when cold!
#14
09-03-2011, 03:44 PM
Just wondering if it got repaired?
Did this procedure fix the problem with downshifting when cold?
#15
12-06-2011, 04:35 PM
tried this ---- twice
Itis not a fluid-service issue.
It is not a TCC issue.
I have done at least 5 of the 2009 4 cylinder auto trans has a harsh down shift 1 or 2 times after cold start, and fine the rest of the day until next cold start up........
When inspected with GDS, likely/almost always there is no DTC, thus system is operating within normal parameters.. program logis is that the duty cycle for solenoid(s) is not long enough to slip the shift (smooth) and instead the solenoid is just being turned on (click.. full oil pressure.. thunk as the clutch pack engages quicker)..
Here is the repair... Install the 2010 model update (it is a campaign for 2010 cars)... There is NO APPLICABLE updates that come up on GDS in ECU Upgrade.
The programs you need is #160 for the engine control, and #161 for the auto trans control.. Have tech call assist, and get a case number related to your car, and they will tell tech how to put the 2010 updates into the 2009 car (cannot be done automatically).
Advise them to print the GDS screen showing the program #160 in the event line, and do same for event #161..... take these 2 prints and attach to repair order as documentation to what was done so DPSM will authorize payment.
After the updates is installed ----> Reset the ADAPTIVE LEARN for the auto trans..... DO NOT reset adaptive learn for engine.. I had to do the whole process over.
It is not a TCC issue.
I have done at least 5 of the 2009 4 cylinder auto trans has a harsh down shift 1 or 2 times after cold start, and fine the rest of the day until next cold start up........
When inspected with GDS, likely/almost always there is no DTC, thus system is operating within normal parameters.. program logis is that the duty cycle for solenoid(s) is not long enough to slip the shift (smooth) and instead the solenoid is just being turned on (click.. full oil pressure.. thunk as the clutch pack engages quicker)..
Here is the repair... Install the 2010 model update (it is a campaign for 2010 cars)... There is NO APPLICABLE updates that come up on GDS in ECU Upgrade.
The programs you need is #160 for the engine control, and #161 for the auto trans control.. Have tech call assist, and get a case number related to your car, and they will tell tech how to put the 2010 updates into the 2009 car (cannot be done automatically).
Advise them to print the GDS screen showing the program #160 in the event line, and do same for event #161..... take these 2 prints and attach to repair order as documentation to what was done so DPSM will authorize payment.
After the updates is installed ----> Reset the ADAPTIVE LEARN for the auto trans..... DO NOT reset adaptive learn for engine.. I had to do the whole process over.
#16
12-16-2011, 10:40 PM
I have tried this twice, both times i printed this out, and left it with the dealer, both times they have had the car for over two days. Both times it has come back not fixed. Any ideas? We had just purchased the car used from a dealer, and it drives great other than this. its frustrating...
Shoot me your Email address and I'll send you a .PDF
Jasen
#17
01-23-2012, 07:34 PM
I don't want to say mine is fixed - but is working now!
I had similar issues with my 2009 Sonata (4 cylinder) - I complained several times to the dealership and they did try several things (flush oil, reset learn codes, etc...). It was not until I started having one on one meetings with service manager to try and get this issue resolved - that they started getting serious, and created a case number with Hyundai. They replaced the ECU (cars main computer - at least that is what they told me) and it is still shifting properly for the last 10,000Km's. They determined this by test driving the vehicle, and got it to down-shift hard when cold, but it would shift properly when the manual shifting was used - back to auto caused the hard shift again! They tried other things, and it lasted for a few thousand kilometers, then start doing it again - so far so good for me!
Cheers, and good luck getting it repaired.
Cheers, and good luck getting it repaired.
#18
10-10-2012, 10:22 AM
Tell them to do TSB 11-AT-003, The info sbr711 wrote in this post is old (but correct) there is now a TSB to directly fix this this problem. It is a well known issue that any good tech should be able to diag just by listening to the discription of the problem.
Shoot me your Email address and I'll send you a .PDF
Jasen
Shoot me your Email address and I'll send you a .PDF
Jasen
#19
01-09-2023, 02:25 PM
Tell them to do TSB 11-AT-003, The info sbr711 wrote in this post is old (but correct) there is now a TSB to directly fix this this problem. It is a well known issue that any good tech should be able to diag just by listening to the discription of the problem.
Shoot me your Email address and I'll send you a .PDF
Jasen
Shoot me your Email address and I'll send you a .PDF
Jasen
Thread
Thread Starter
Forum
Replies
Last Post
