Speedometer doesn't work and transmission doesn't shift gears.

dfrinzi
185

Asked by Nov 25, 2011 at 07:33 PM about the 1999 GMC Sierra 1500 SLT 4WD Extended Cab LB

Question type: Maintenance & Repair

The speedometer stays at 0 all the time.  When the transmission is in drive it won't come out of 1st gear.  Reverse works fine, and if I manually put the transmission in 1st or 2nd it works fine.

1999, Auto 4wd, automatic, 5.3L

36 Answers

Dan Nash
595

Vehicles transmission output speed sensor faulty

36 out of 36 people think this is helpful.
Best Answer
dfrinzi
185

I replaced both output speed sensors, and also swapped them around with the old ones, no luck. This problem started after I removed the transfer case to install the wear plate and replace the actuator motor, not sure if that has anything to do with it. The 4wd works fine. Thanks

18 out of 18 people think this is helpful.
DanTheMan5160
205

It's Vacume or electrical is your problem or passing gear cable.If the passing gear cable is broke,unhooked at the throutle body or unhooked inside the transmission would cause that as well.Yep,Vacume could be if your 4wd works under vacume hoses or lines.If your 4wd is electric .You either got a vacume line crossed/wrong.Or leak in a vacume line or unhooked.It's not a speed sinser.Transmission Shifts either from Vacume or electrical.Sounds like to me from playing around with the transfer case you made a mistake.

12 out of 12 people think this is helpful.
kemuhps
390

2003 Sierra-My truck is doing the same thing- speedo reads zero and won't shift out of first. I cleaned the MAS, replaced shift sensor, made sure trans fluid was full, disconnected and reconnected the battery, and now I am thinking of replacing the stepper motors for the speedo but don't think that covers the shifting issue. ANY HELP welcome!

39 out of 39 people think this is helpful.
Joe Bartlett
685

vehicle speed sensor,on the rear of the transfer case ,if you got no speed o your truck wont change gears

25 out of 25 people think this is helpful.
rberber
300

I replaced the vehicle speed sensor VSS then unplugged the vehicle speed sensor buffer VSSB (a 3 inch square flat white plastic sensor box) located behind the glove box, I unplugged it and waited 5 minutes before plugging it back in. I also pulled the brake fuse and did the same thing, waited 5 minutes then plugged the fuse back in. The result was successful, the tranny and speedometer work correctly now!

30 out of 30 people think this is helpful.
tonypergar
40

I did what you said but n luck

2 out of 2 people think this is helpful.
tonypergar
40

replaced the vss then unplugged the buffer waited 5 minutes then pulled the brake fuse and waited 5 minutes but no luck transmission still not shifting and no speedometer.

2 out of 2 people think this is helpful.
Willie Gillispie
10

same for me no help at all

1 out of 1 people think this is helpful.
juggaloscorpio
65

check the ignition switch harness for power drops across the white wire and the pink wire... it is a know problem for the harness to lose power there and causes loss of transmission shifting along with instrument cluster failures.

6 out of 6 people think this is helpful.
Raymond McNeil
60

My 2000 Tahoe LT 4×4 has that not changing gears issue. Put it in drive - nothing, go to 1stthe and it grabs, you manually shift it, works great, even drops down gears and then changes great. The main problem is after I manually shift it, I come to a COMPLETE stop, it goes right into basically neutral, but if I don't COMPLETELY stop it keeps pulling. Once that happens, I have to manually shift it out again. Does anyone have an idea of what themayis be? issue

6 out of 6 people think this is helpful.
Jeffrey Kill
200

its more then likely the seo ign 10 amp fuse in the fusebox next to driver door the fuse looses power causing instrument panel failure and transmission goes into a nuetral state

7 out of 7 people think this is helpful.
Terry Huffman
170

You said check the ignition switch harness for voltage drops I think that could be my problem because when I check the buffer voltage I only get five volts at the speedo buffer I thought I was supposed to have at least 12 volts is that correct? Do I possibly have a bad ignition switch ?

12 out of 12 people think this is helpful.
William Zierman
350

I just replaced my trans in 01 Yukon. I'm having the exact problem originally stated by dfrinzi. speedo not working and won't shift out of 1st in od but I can manually shift from first to second but not 3rd or fourth. Jw if this problem was resolved and how to go about it thanks.

33 out of 33 people think this is helpful.
Jeffrey Kill
200

Speedo sensor in transfer case I replaced it now it shifts fine speedometer works like it should and I haven't had any other problems

2 out of 2 people think this is helpful.
Richard Longacre
40

I had similar problem and mine turned out to be the safety neutral switch.

4 out of 4 people think this is helpful.
Jeffrey Kill
200

I retract my last statement worked good for almost 2 weeks then started acting up again I'm at a loss

4 out of 4 people think this is helpful.
bildur1
50

I found a TCM fuse (10) under the hood that was blown. Was hard to tell for certain but I replaced it and the speedometer and transmission are working properly now

5 out of 5 people think this is helpful.
cesale
70

I have a 2005 Tahoe and my speedometer and gas gage doesn't work gas gage stays buried over full and speedometer stays at zero any ideas?

7 out of 7 people think this is helpful.
William Zierman
350

Speed sensors on the top side of transfer case, one or the other is bad or unplugged

2 out of 2 people think this is helpful.
Mark Lutz
160

I have no power to the 10 amp Trans fuse. What color wire at the in essence which supplies the power to that wire? 95 gm 1500 4x4

7 out of 7 people think this is helpful.
Mark Lutz
160

ignition switch damn autocorrect

3 out of 3 people think this is helpful.
Steve Mcmillan
70

just replaced the trans cooler lines due to a leak and now my 02 trailblazer wont shift and speedo not working all the time

7 out of 7 people think this is helpful.
Terry Huffman
170

I replaced my ignition switch and problem was solved I wasn't getting 12 volts to the speedo buffer behind glove box

5 out of 5 people think this is helpful.
JBowling907
20

I've got no speedo and had 2,3,4 but no 1st. Took it to tranny guy who scanned it and cleared codes, now only 1, and 2 manually like it's in limp mode. My vss is good, ignition good, but my tccm is corroded. Could that be the whole problem. 2001 s10 zr2

2 out of 2 people think this is helpful.
Brian Sullivan
35

Speed sensor

2 out of 2 people think this is helpful.
jp9210
90

I am having same problem 99 tahoe abs light comes on speedometer not working could it be my ignition switch harness?

9 out of 9 people think this is helpful.
desmon1978
10

I'll try the ground behind engine passenger side in wire harness thanks Desmon Cross the man I say...

1 out of 1 people think this is helpful.
Elliertal
10

Hello everyone , i goth a gmc sierra 1996 4x4 with 75 000 km. I have a problem about my gear when i shifted with it. When i put the gear on (regular) the trunk going in front like the gear (Drive)... If i put the gear in (reverse) i goth nothing... If i push some gas when im in (reverse) the motor sounds like overload .. Do you think is the cable ? Or the tranny ? Or a sensor ? Or the neutral switch ?

EdMullis
70

It "AIN'T" the speed sensor. PERIOD!!!!!..... It "might" be in the circuit that comes from the speed sensor or one of the parallel or series circuits that the speed sensor is also interconnected with..... But in more than 95 percent of the cases that have been brought up in any of these forums thus far, replacing the speed sensor "DID NOT" solve the issue..... I'd be willing to bet that anyone who encounters this problem will find the solution only through tracing ground connections within the harness..... Codes thrown in one instance where it says that the speed sensor or one of the temp sensors, or the IAC, or the map sensor is the cause, will only pop a different code for another sensor when you replace the one that shows bad..... There is either a bad ground or a short to ground somewhere in the wiring harness..... Good luck finding it, cause in most vehicles where all the sensors are connected to the ECM or PCM, all the sensors are interconnected within the ECM, and are directly influenced by the feedback from another sensor...... Some of you have just been lucky in finding a solution by merely replacing the "one" sensor that isn't grounded right or that is shorted somewhere in the harness. If I ever discover the specific short or bad ground in the circuits on my 94 GMC 1500, I'll let you know where and what. Till then I'm seriously considering selling this thing for scrap and getting a ford.

Audet3
10

Please do because mine is acting up. My speedo started going haywire but I'm not sure if it's a loose wire because it happens and then it stops. One day it will be fine and one day it won't be. I could hit a pothole and it starts to slip out of gear. I'm going to go to the scrap yard and get a couple used vehicle speed sensors and try it for the helll of it

1 out of 1 people think this is helpful.
Audet3
10

And I have a 93 sierra k1500

EdMullis
70

I got in touch with GMC about getting a tech manual, or whatever else I could use to chase down the problem on my truck......They didn't have anything on before 96, but the lady I was having the chat with sent me a couple email addresses.....One was....... http://www.autobooksbishko.com/search.cgi?year=1993&make=GMC&category=Shop+Manual.....The other was Helms, but I just randomly selected to go with bishko.....Cost $44.67 to get a cd on "my" 94 sierra, plus of course the various options that it could have come with in the same line.....It has cost me around $70.00 in ink to print out all the pages I've wanted to look over better.......Hard to bounce around the PDF file as quick as you can a book, especially when you have to flip back and forth every once in awhile.....The printed manuals themselves cost a bit more than the cd.....But if you wanted "every single of the manual" printed out it would probably cost you about three times what the printed manual itself cost's.......Personally I'm glad I went with the cd.......At least that way if a page gets destroyed by the wind of saturated in oil, I can easily print out a new one.....from either the original disk, the backup I put on my hard drive, or the one I put on a small flash drive......I have about 800 pages out of over 3000 printed and it told me "exactly" where to look and what to test to find at least "one" ground wire disconnected that literally killed my battery while it was running. Oh.....Update.....I decided 'before' receiving the cd to replace the distributor because I discovered an oil slick inside of it, and clear evidence of dried oil like stains on the plate......actually caused by a deformed and cracked distributor gasket.....I just decided that, "If I'm gonna take it out and have to put it back in right, then I'm going with a new one".....At least 90 percent of my problems were cured with the new distributor, but there was/is still a little glitch.....start right up, stubborn about idling till it warmed up good, run like a new one, almost is all new now.....After it gets hot, if you shut it off, it ain't starting back up......Took a 60 mile round trip, left the engine running when I stopped by a couple stores and a friends house for maybe fifteen minutes each with the doors locked.....Set and idled like it was new, ran great though the speedometer didn't work at all, and I later discovered that neither did the rear lights.....The manual literally told me exactly what to do to find the broken ground wire beneath my truck, and where it was located......I was hoping that "that" was the problem....But no........I have come to the conclusion, whether correct or erroneous, that my starter solenoid is half shot, 'but' in order to find out, you have to, on my truck, take the starter off the truck just to get to the blame terminals to do the test's that the manual describes...IF IT WAS A FORD, I could tell you in five minutes if the solenoid was bad......But I will have to say that the GMC has been generally much easier to work on otherwise.....I'll let you know tomorrow evening whether or not it "was" the solenoid that caused the last of the problems. Though I may just decide to go with a new starter....Either way, I'll say something even if it's just "damn!"

EdMullis
70

for what it's worth.....Finding the loose ground wire, and reconnecting it where it was supposed to be "at least" fixed the speedometer....I ain't saying that that is "your" problem with the speedo, just that fixing the broken ground fixed my speedometer problem.......

1 out of 1 people think this is helpful.
prosetter
20

i had the same problem on my 98 chevy pu with a 4l60-e transmission,gages stopped working speedo reads 0 and abs lite came on .....took it to my transmission shop they looked at it took 10 min to find problem....the wires going to the vss sensor had been chewed up by a Squirrel....spliced wires back together and problem is fixed...all is working fine.

2 out of 2 people think this is helpful.
Nicholas Olson
0

I got a 1995 chevy k1500 5.7ltr 4L60E tranny and mine did same thing i replaced output on transfercase cleared it right up..

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