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Speedmoter jumps to 20 when i put truck into reverse or drive

When i put the truck into reverse or drive and press the acelator the speedometer will jump to 20 .. 30 mph.. and if i continue to accelarate the speedometer will show 50... 60 and eventually tap out at 100 mph,, and i might be going 25 to 30 mph.. i have changed both sensors and still have this issue,, if i unplug the speed sensor on the transmission the truck operates normal and shifts through all gears,,.. what is the solution to this problem ?

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  • 79 Answers

SOUNDS LIKE A BAD SPEEDOMETER if you can use an OBDII while driving and look for DTC output from speed sensor. possible loose connection can cause this as well

Posted on Nov 06, 2012

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6 Suggested Answers

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Posted on Jan 02, 2017

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Levyathos
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SOURCE: 1996 Corolla Auto Transmission problem

Hi. 2005 Corolla CE. It's normal. They tend to do this when upshifting form 1st to 2nd gear. No timing chain readjustment needed.

96 Corolla. Overdrive not working properly, if not engaging after 45mph constantly. If driving on the city, is normal, but not after 45mph, when the car is trying to engage overdrive in order to save gas and preserve the trans gears. If not able to get help at the dealership, find another one and explain them the situation.

Posted on Aug 21, 2008

  • 183 Answers

SOURCE: Replaced rear differential speed sensor

Did you use a mopar sensor.I have fixed this problem many times and not had much luck with the aftermarket sensors.Just a thought.Good Luck!!!

Posted on Aug 04, 2008

jmeredith
  • 417 Answers

SOURCE: 2005 Toyota Corolla with 36,000 miles Transmission now "jumps" into gears

hi,
when the check engine light comes on, your car goes into a mode where instead of everything being normal, things are forced, to try and compensate for something else being wrong. It most likely does need a new timing belt, and a complete tuneup INCLUDING plugs and wires. we have a 1984 toyota corolla and it purrs like ground rice, I suggest the tuneup to continue proper rice production.

J

Posted on Aug 01, 2008

  • 3 Answers

SOURCE: Transmission won't shift properly (2 wd ) speedo does not work

Its weird but I had a fuse blow out awhile back that is the same fuse that works the cab lights when you open the doors. When this fuse went out it also made it shift odd and hard when it did shift. Since it is only intermittent in your case, It may just be a weak fuse.

Posted on Aug 28, 2008

  • 1 Answer

SOURCE: Speedometer 2004 Yukon

I have that problem as well and so do others

SPEEDOMETER SETTLEMENT NOTICE

The court granted approval of the settlement and entered judgment on November 7, 2008. However, two separate appeals have been filed which seek to challenge the court's approval of the settlement. The settlement will not become effective unless and until all such challenges have been resolved and the judgment has been upheld.
Please check back to this site or call our toll-free number
(866) 514-0405 after January 19, 2009, to determine the status of the appeals and whether the settlement has become effective.

The problem may be the Electrical - Powertrain control - Vehicle speed sensor, which is easy to replace but why should you have to pay for it if that is the problem. A GMC mechanic inform me that water is he main cause for its failure.

There are others who have call a GMC Service Rep to have it fix, which i will try first.

GMC Customer Assistance Centers
GMC Customer Assistance Centers are open Monday through Friday, from 8:00 a.m. to 11:00 p.m. (Eastern Standard Time). To contact the GMC Customer Assistance Center inside the U.S., call:
1-800-462-8782
When calling, please have the following information available:

Your name, address, and home and daytime telephone numbers
Your Vehicle Identification Number (VIN)
Dealership name and location
Vehicle delivery date and current mileage
Nature of your concern

Service Manuals and Owner Publications Service manuals, service bulletins, owner manuals, and other service literature are available for purchase for all current and many past model General Motors vehicles. The toll-free telephone numbers for ordering GMC Service Manuals are:
Inside the U.S.:
1-800-551-4123
Inside Canada:
1-800-551-4123


check out these link for additional information

http://townhall-talk.edmunds.com/direct/view/.f11f710

Good Luck,

Fireballs

2004 Gmc Yukon


Posted on Jan 01, 2009

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