Question about GMC K1500

1 Answer

I have a 1999 GMC K1500 4X4 SUBURBAN WITH A 5.7 liter engine. Problem is that it won't shift into Overdrive. Replaced both of the Speed Sensors that are located above the transmission and still only get 3rd Gear. Does 70 at around 3000 rpms when before it would be at about 2000 rpms at the same speed. Fluids and filter all checked out. No leakage and no slippage. Shifts perfect at all other gears except for Overdrive. Suggestions?

Posted by on

1 Answer

  • Level 3:

    An expert who has achieved level 3 by getting 1000 points

    Top Expert:

    An expert who has finished #1 on the weekly Top 10 Fixya Experts Leaderboard.

    Superstar:

    An expert that got 20 achievements.

    All-Star:

    An expert that got 10 achievements.

  • GMC Master
  • 42,022 Answers

Overdrive servo/ solenoid is not operational , either from failed unit or wiring problem
check transmission actuator for operation or adjustment as well

Posted on Jul 07, 2017

6 Suggested Answers

6ya6ya
  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

Hi,
a 6ya expert can help you resolve that issue over the phone in a minute or two.
best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
the service is completely free and covers almost anything you can think of (from cars to computers, handyman, and even drones).
click here to download the app (for users in the US for now) and get all the help you need.
goodluck!

Posted on Jan 02, 2017

shaggyrat
  • 1224 Answers

SOURCE: 2003 chevy silverado will not shift into drive or overdrive.

transmission shift solenoid is stuck open this is a common vehicle issue in automatics and not particular to any make or model vehicle 15 dollar part and arm and leg for labor if taken in

heres an idea to try
take out the transmission filter and replace with new one make sure to take not of any metal debry in trans pan this indicates the trans had sheered its gears down and a trans rebuild is needed
the transfilter needs to be changed at a certain milage interval they can get clogged up
there is a kit you buy for your truck at any parts store
its an easy change hour of time unbolt trans pan unbolt trans filter and put new one in
kit comes with new seals less than an hour you can do it yourself

to overdrive you would feel a difference in shift badley if it was that something to keep in mind

Posted on Dec 06, 2008

  • 4 Answers

SOURCE: '03 suburban transmission

It might fix the problem but you may also have a shift sensor that is starting to go bad as well take you suburban to autozone or an o'reillys if you have one of those auto parts stores near you and they can do a scan on all the sensors to tell you if your vehicle is showing any problems with any of your sensors I hope this helps you out.

Posted on Jan 30, 2009

  • 1 Answer

SOURCE: 1997 Ford Taurus, Won't Shift Past 3rd Gear

The forward clutch control valve has a retaining clip that is known to break on these tranny's. This can prevent it from shifting into 4th gear. Good news, the part is five bucks. Bad news, it's in the valve body which takes a few hours to get to. I fixed mine in about 8 hours thanks to great step by step instuctions I found online. Search for "valve body removal taurus tranny". If it's not the retainer clip then it could be one of the solenoids on the valve body. I believe there's one just for 3rd and 4th gear. Good luck

Posted on Sep 18, 2009

  • 1 Answer

SOURCE: automatic transmission linkage adjustment. Is

REPLACE A SERPENTINE BLET

Posted on Oct 19, 2009

Molson02536
  • 3854 Answers

SOURCE: transmission shifts from 1 to 2nd just fine shifts

Check the transmission fluid level to make sure it's at the proper level. Have a transmission shop determine with a scanner that if it's your 3-4 solenoid or the wire harness has gone bad and will need to be replaced. You have a 4L60E transmission and this is common if your Throttle Position Sensor (TPS) is faulty and needs to be replaced, easy fix, just replace the TPS on the throttle body. Your Electronic Pressure Control valve EPC is faulty due to dirt from dirty transmission oil and filter, or the solenoid has gone bad or the wire harness on the passenger side by the catalytic converter has gone bad from corrosion or loose. Try disconnect the wire harness on that side and cleaning it out with break parts cleaner and reattaching it to see if that helps before you drop the transmission pan to get to the solenoid. The solenoid is around $45.00 and take about 10 min to replace once the transmission pan is replaced so this should cost around $150.00 repair with the oil and filter replaced also have them replace the boost valve "$45.00" with a 0.490" boost valve to bring up the transmission line pressure to help you get more life from your transmission and should be replaced every 60,000 miles as a part of the transmission service. Good luck and keep me posted, be glad to help you get your transmission running 100% again soon.

Posted on Jan 05, 2010

Add Your Answer

Uploading: 0%

my-video-file.mp4

Complete. Click "Add" to insert your video. Add

×

Loading...
Loading...

Related Questions:

1 Answer

I have a 94 gmc suburban 1500 4x4 when it down shifts to pull a hill it loses speed. What can I do to fix it


Be sure you are not using overdrive in this situation...Power loss can be caused by a clogged catalytic convertor...(Air Filter)

Aug 16, 2015 | GMC Cars & Trucks

1 Answer

All the warning lights are on but dimb domelight comes on and off and trans keeps shifting out of overdrive


have warning lights tested for codes replace domelight bulb have overdrive checked out at trans shop

Dec 15, 2011 | 1999 GMC Suburban

1 Answer

93 suburban K1500. Had a check engine light. Replaced the TPS. Now, no check engine light, but shifts hard and no overdrive. Ideas?


try to adj tps sensor overdrive clutch could have burned out or tcc seliold could be bad put on computer to find out

Feb 09, 2011 | 1993 Chevrolet Suburban

1 Answer

I have a 1999 jeep cherokee that has intermitant transmission problems 1)shifting up it wind out to 2k-3k before shifting 2) at higher speed it feels as if it slips out of overdrive rpm increase but speed...


It will shift out of overdrive upon increasing throttle , pulling hills and so on. Your overdrive probably kicks in around 35 to 45mph and kicks back out as you increase throttle. Electrically controled speed sensor to control the response. Overwise the engine would bog down to a stall. Over drive is just that. It changes the gearing ratio to over drive meaning less then final gear 4 to 1 down to 4 to 3 etc more direct drive ratio to lessen consumtion of fuel with less stress on engine. Have shift speed sensor adjusted. Don't drive in overdrive in city if most driving is under 45mph

Mar 09, 2010 | 1999 Jeep Cherokee

1 Answer

Help...94 Suburban 1500 auto 4x4, I am changing


I'm pretty sure GM built your truck with the diesel engine as an option so there is a way to make this work. The trans shifts are based on a combination of ground speed and engine RPM so as long as the computer is able to get these signals your trans should work. I put an early 90's overdrive in a mid 80's truck and didn't plug the wiring in because the trans used a 4 wire plugin and my truck only had a 3 wire. It worked fine, even overdrive.
A little jury rigging and ingenuity should find a way to attach your current kickdown cable to the accellerator on the diesel pump. GM probably has a bracket to make it fit. Check with the parts guys at the counter. Hope this helps.

Oct 03, 2009 | 1999 GMC Suburban

1 Answer

91 gmc shifts in and out of overdive


I had an 89 Suburban that started doing the same thing. Change the fluid/filter and add a quart of Lucas Transmission Fix. See how that does. Ultimately, you are going to have to rebuild or replace the transmission as the problem will only get worse in the end. Mine finally went down completely and cost me about $2700 to rebuild.

Apr 05, 2009 | 1999 GMC Suburban

1 Answer

92 SUBURBAN 4X4 down shifting


  • may have a loose le nk on the lever switch on the transmission part if so try to tighten le nk on the switch.

Mar 26, 2009 | 1995 GMC Suburban

2 Answers

I have a 94 gmc pickup v-6 with 4l60e tranny and it won't stay in overdrive once it warms up but shifts and drives well otherwise. If I leave it in drive it seems fine. Any suggestions?


HI!!! sounds like you have trany link conector problem. even if the pointer works well on P'R'ND2'1. when you move the link connetor moves on the bottom because its braket is loos

Feb 18, 2009 | 1999 GMC Suburban

1 Answer

1996 TBird 4.6 auto/overdrive trans problem


Your transmission fluid contain water,thats why the colour of the fluid changed to pink.And of such the clutch is slipping causing the engine to reve up before shifting - Check transmission cooler.

Aug 21, 2008 | 1996 Ford Thunderbird LX

Not finding what you are looking for?
Cars & Trucks Logo

Related Topics:

50 people viewed this question

Ask a Question

Usually answered in minutes!

Top GMC Experts

yadayada
yadayada

Level 3 Expert

75744 Answers

Freddy

Level 3 Expert

1311 Answers

Colin Stickland
Colin Stickland

Level 3 Expert

22114 Answers

Are you a GMC Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides

Loading...