I have an 04 Sonata, problem seems to be it will not go into 2nd gear, keep in mind it is an automatic. It will hit 3000 RPM's then start all over again, once it hits 3000 I get up to 20MPh then it drops me down to 10MPh and I have to rev it back to 3k, but it will not go further than that. Any ideas or suggestions would be appreciated, Thanks...

 

MIL illuminated ?

The place to start, have it scanned... fluid level, not that it matters too much, box only does what it is told by the controller (PCM/TCM)..

 

MIL? I think it might just be the fluid, its got 97000 miles on it, havent been changed yet...

 

MIL = Malfunction Indicator Light. More commonly known as the CEL = Check Engine Light.

97K miles is WAY too much on the fluid. It should be changed every 30K miles.

 

I got the car with 60k on in, I havent had it changed thus far, and do not believe it has been changed yet. Hoping that is the issue...

 

The Sonata 2.7L TCM reprogramming provides the following refinement updates:

• Reduced 2-3 shift flare (engine speed increases during the 2-3 shift) during the first acceleration after a cold engine start

• 1-2 and 2-3 shift quality improvement (harsh shift improvement)

• Delayed shift feeling improved (from park to drive or park to reverse)

VEHICLES AFFECTED:

• Model: 2003-2004 SONATA vehicles with 2.7L engines and automatic transaxles

• Affected vehicle production date range:

-- Produced from November 29, 2002 through December 14, 2003

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Then follow up with this program --

2003-2004 SONATA 2.4L/2.7L TCM REPROGRAMMING INSTRUCTIONS FOR DRIVELINE BUMP BETWEEN 2-10 MPH

"62. EF 2.4/2.7 DRIVING FEEL IMPROVEMENT"

DESCRIPTION:
Some 2003-2004 Sonata vehicles with 2.4L and 2.7L engines (see affected VINs and
production dates below) may experience a mild, one-time driveline bump when
accelerating from a stop after the vehicle has been parked for more than one hour.

The driveline bump will be felt as one, two or three successive bumps between 2-10
mph and will occur only once for each driving cycle. The driveline bump will not occur
after the engine and transaxle are at normal operating temperature.

This bulletin provides the procedure to reprogram the Transaxle Control Module (TCM)
software in 2003-2004 Sonata vehicles with 2.4L and 2.7L engines using the Hi-Scan
Pro. (should be able to use GDS here too)

VEHICLES AFFECTED:

• Model: 2003-2004 SONATA 2.4L and 2.7L vehicles.

• Affected vehicle production date range:

- 2.7L: Produced from Nov. 03, 2002
- 2.4L: Produced from Nov. 02, 2003

• Affected VIN range:

- 2.7L: Produced from KMHWF35H03A798938 (With TCS)
Produced from KMHWF35HX3A798901 (Without TCS)

- 2.4L: Produced from KMHWF25S14A982051

__________________________________________________ _________________


After programing, disconnect battery for couple minutes to reset adaptive, hopefully ATF is good and hot when program done so right adaptive reset, they can do the initial learn start-up before releasing car.