When warmed up transmission does not shift properly

Tiny
NSTEELE
  • MEMBER
  • 2014 KIA SORENTO
  • 2.4L
  • 4 CYL
  • 4WD
  • AUTOMATIC
  • 87,000 MILES
When car is cold, it shifts fine. But when the car is warmed up, if I start from, park, to drive, the car will jerk, then go. Sometimes going from park, to reverse will do it too.
Monday, March 11th, 2019 AT 7:28 AM

3 Replies

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,640 POSTS
Welcome to 2CarPros.

The first question I have is this. Has the transmission fluid ever been changed? Have you checked fluid level and condition?

Also, is the check engine light staying on when the engine is running?

What I suggest first is to confirm the transmission fluid is full and clean. To check the fluid level, the engine needs to be running and at operating temperature. You will remove the fill plug on the transmission (oil level). Fluid should trickle out if it is fill. If nothing comes out, you need to top off the fluid level until it begins coming out. Take a look at pictures 1 and 2. They show both the drain and fill plugs. You want to remove the fill plug to check this.

If the fluid is extremely low or dirty, you really should drain and refill it. Here are the directions for that. Also, the start of the directions indicate how to add fluid if it is low. The remaining pictures correlate with these directions.

__________________________

Repair Procedures
Vehicle Maintenance Fluids Fluid - A/T Service and Repair Procedures Fluid Repair Procedures
REPAIR PROCEDURES
Service Adjustment Procedure

Oil level Check

NOTE:
A check of ATF level is not normally required during scheduled services. If an oil leak is found, perform the oil level check procedure after repairs are completed.

CAUTION:
When checking the oil level, be careful not to enter dust, foreign matters, etc. From fill hole.

1. Remove the ATF Injection hole(eyebolt) (A).

ImageOpen In New TabZoom/Print

CAUTION:
Always replace the O-Ring (A) of the eyebolt use new one whenever loosening eyebolt.

ImageOpen In New TabZoom/Print

2. Add ATF SP-IV 700cc to the ATF injection hole.
3. Start the engine. (Don't step on brake and accelerator simultaneously.
4. Confirm that the temperature of the A/T oil temperature sensor is 50 - 60 C (122 - 140 F) with the GDS.
5. Shift the select lever slowly from "P" to "D", then "D" to "P" and repeat one more at idle.

CAUTION:
Stop in each gear position for 3 seconds.

6. Lift the vehicle, then remove the oil level plug (A) from the valve body cover.

ImageOpen In New TabZoom/Print

CAUTION:
At this time, the vehicle must be a horizontal state.

7. If the oil flows out of the overflow plug in thin steady stream, the oil level is correct.
Then finish the procedure and tighten the oil plug.

NOTE:
Oil level check (excess or shortage) method
- Excess: Drain quantity exceed 900cc for tow minutes. (50 - 60 C(122 - 140 F))
- Shortage: No drain.

CAUTION:
If there is no damage at the automatic transaxle and the oil cooler, the oil cooler hose, transaxle case, valve body tightening state are normal, ATF must drop out after performing above 1 to 7 procedures. After performing above 1 to 7 procedures, if the oil doesn't drop out, inspect the automatic transaxle assembly for oil leaks.

CAUTION:
Replace the gasket before reinstalling the oil level plug.

Oil level plug tightening torque :
Tightening up stopper

8. Lower the vehicle with the lift and then tighten the eyebolt.

Replacement

NOTE:
The ATF of the 6 speed automatic transaxle does not need to be replaced. If the vehicle is used in severe conditions or business use, replace ATF every 60,000 miles.

Severe usage is defined as
- Driving in rough road (Bumpy, Gravel, Snowy, Unpaved road, etc.)
- Driving in mountain road, ascent/descent
- Repetition of short distance driving
- More than 50% operation in heavy city traffic during hot weather above 32 C(89.6 F).
- Police, Taxi, Commercial type operation or trailer towing, etc

1. Remove the drain plug (A) and reinstall the drain plug after draining ATF totally.

Drain plug tightening torque :
38.2 - 48.1 N.M (3.9 - 4.9 kgf.M, 28.2 - 35.4 lb-ft)

imageOpen In New TabZoom/Print

CAUTION:
Replace the gasket before reinstalling the drain plug.

2. Fill the oil about 5 liters.
3. Check the oil level.

_____________________________________________________

Let me know what you find or if you have other questions.

Take care,
Joe
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Monday, March 11th, 2019 AT 5:25 PM
Tiny
NSTEELE
  • MEMBER
  • 2 POSTS
Thanks for the response.
A few weeks ago, I took the car up to a transmission repair shop. They said that the fluid was low, and that they topped it off, but it was still doing the same thing. Unfortunately, I couldn't let them keep the car. I had to take the car to KIA for a recall. Kia couldn't figure it out either. But they did recommended a transmission flush. I'll try that. Thanks
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Monday, March 11th, 2019 AT 9:48 PM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,640 POSTS
Welcome back:

If they perform a flush, that will only exchange the dirty fluid in the transmission with new fresh fluid. Ask them if there is a filter that should be replaced, too. Often times, if a filter is partially plugged, flushing the system will help for a short time, but the same thing will start again. Where I work, we recommend the filter be replaced, and then the system flushed.

That's your call. Let me know if you have questions or the results.

Take care,
Joe
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Tuesday, March 12th, 2019 AT 8:43 AM

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