Transmission Shifting issue: need help please

[Y33TREKker]

I know you said you replaced the Model Selector Switch, but were all of the pins in the electrical connector clean/straight/etc? There's also a connector in the same general area of the one I suggested last time that you could check. It's a blue one and is straight to the left among a few other connectors, and it serves as a connection between the A/T Shift Indicator Control Unit and the Meter Assembly

Those two connectors would be about the last common denominators as far as electrical connections go before you have to start looking at the solid state A/T Shift Indicator Control Unit and the Meter Assembly in the dash that actually contains the indicator bulbs.

[creeg]

Thanks Y33TREKker

I will look at the other plug you mention tomorrow.

Regarding the Mode Selector Switch: I had that installed by a transmission shop here in Los Angeles. They were the ones that noticed that one of the bolts that was holding the old Mode Selector Switch was broken (and they extracted and replaced that bolt). My hope is that they were thorough enough to check the pins when installing it. They seemed like a reputable shop.

[creeg]

Thanks MSHardeman

Since the GM transmission is in other vehicles, Im going to do a search to see if there is mention of those other vehicles having the missing shift issue.

[creeg]

Been doing some reasearch on the transmissions, and found some articles

http://forum.planetisuzoo.com/viewto...n+missed+shift

http://etereman.com/blog/general-mot...w-to-fix-them/

http://forum.planetisuzoo.com/viewtopic.php?f=4&t=66767
***This one talks about a "transmission range-mode sensor"

Anyone know what that is?

Thanks
Craig

[Y33TREKker]

http://forum.planetisuzoo.com/viewtopic.php?f=4&t=66767
***This one talks about a "transmission range-mode sensor"

Anyone know what that is?

Thanks
Craig

Seems like they were just talking about the Mode Selector switch by another name. I found another thread where someone was talking about cleaning their "range-mode" sensor, and the picture they linked to in the first post was of the same basic kind of switch.

http://www.automotiveforums.com/t978...e_sensor_.html

[VXobsession]

It's the technical word for the neutral safety switch. It tells the computer what gear it's in.

[VXobsession]

Creeg this is Marcus VXobession's husband. We own a transmission shop in Arkansas. I've built many 4l30e's. I would like to help you get to the bottom of your transmission problems. If you can give me a call at 501-860-5567. I have many questions and things for you to do so we can solve this problem. To address some of the previous posts, the range mode sensor, mode selector switch, mlp, prdl switch, neutral safety switch, ect, they are all the same thing. Different shops/people call it different names. The 4l30e has 5 solenoids. An Epc (electronic pressure control). This affects all shifts and engagement into drive and reverse. It controls line pressure. A lock up solenoid. This is for the torque converter clutch. 99 to 2000 use an on/off switch 2001 use a pwm (pulse width modulation) type. Two shift solenoids an A &B. These are on/off type. It use a combination of these to shift the transmission through the 4 gears. Last of all is a band apply solenoid (2/3). This is a pwm type. It uses this solenoid to control the forward band. It controls the band's apply when you put the transmission in drive and it controls the band release as the transmission shifts from 2nd gear to 3rd. The mode selector switch has 2 bolts holding it on, the one broke would not affect anything (needed fixed but for sure not the problem). This switch does give many problem with this transmission, but won't make it skip a gear. Also the vx transmission is different in 2001 from the other 2 years. A 99-00 will not work correctly in a 2001 and will fail. They look the same but are different. I do not like the way shops treat VX owners. They see our rides and they instantly see $. Mechanically a VX is nothing more than a trooper. Before everyone gets mad, yes its does have some special parts on it. But, the motor, transmission and transfer case are all trooper.

[creeg]

Wow!

Thanks Marcus-

I just left you a voicemail, cant wait to talk to you for more details.

Mine is a 2001 VX.
It sounds like it may be the Band Apply Solenoid, based on your description.

What I have is a missed shift at 27 mph when accelerating. Its intermittent, and doesnt happen every single time, but it happens on almost every drive.
It will start to rev up as it misses the shift into the next gear, at which point I back off the gas. Most of the time, it will shift into the next gear and I can continue on my way.
Sometimes, it will not and I will have to rev it a bit, which seems to get it into the next gear.
Additionally, that shift at 27 mph seems to be a bit clunky sometimes.

I also have a new symptom as of about 2 weeks ago, that may or may not be related: the shift light in the dash for "D" no longer works. All other gears are fine, but the "D" light does not come on. Dont know if that is due to some wiring or if the bulb in the dash has actually gone out.

Thanks, and looking forward to talking with you!

C

[creeg]

Oh great.
My "ABS" light just came on too.
Stupid Vehicross.

[VXobsession]

Tried to call you back....
And for the record, how many in here have an ABS light on?? Please raise your hand....mine is up...

[bartmanS4]

Hand raised

[creeg]

Ok, so what does the ABS light mean? I need to have my brakes checked?

I just had the "D" light go out in my dash about 2 weeks ago, so Im concerned that there is something wrong with my computer or something: along with the fun times with my transmission....

[LittleBeast]

My ABS light was on for years, so I eventually just took the bulb out.

[creeg]

Finally getting around to taking my car in to get the A, B, and Band Apply Solenoid replaced (I was getting married, so I had to put the repairs on hold for a couple weeks).
Taking it in tomorrow, thanks to Marcus VXobession's advice.
Hopefully this fixes my issues, and I am back on the road with no more missed shifts soon!

[tom4bren]

My ABS light was on for years, so I eventually just took the bulb out.

X2