Question about 1989 GMC Sierra

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VEHICLE SPEED SENSOR

WAS RUNNING GREAT AND I MADE A U TURN AND TRUCK STOPPED SHIFTING PROBERLY

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Check the vacuum line to your modulator valve on the tranny. It may have popped off when you hacked your nut.

Posted on May 04, 2009

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1992 Subaru legacy wagon will not shift up from first gear. it is an AT.


run the fault but all you describe is operated from the VSS sensor ( vehicle speed sensor)
it tells the cruise control the vehicle speed , tells the TCM the vehicle speed so that ratios can be changed, activates the speedo,and will report with a check engine light to report a transmission problem
run the fault codes first

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03 Intrepid starts great, engine quiet, runs spectacular until I hit approx. 40 mph then the rpms will go up to approx. 3000 but the car wont shift. Any suggestions?


Check for codes, may have a bad speed sensor either input(turbine) or output (vehicle) speed sensor. They are a common problem with the Chrysler transmission.

Oct 20, 2013 | 1994 Dodge Intrepid

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1994 chev 4x44l60 trans,np241c tcase,speedo stopped working trans immedeatly stopped shifting past 2 gear


FIX SPEEDO MAY NEED A SPEED SENSOR AND IT WILL NOT SHIFT IF IT DOES NOT SEE THE OUT PUT SPEED

Feb 21, 2013 | Cars & Trucks

1 Answer

My speedometer stopped working so my truck is stuck in 1st gear


Hi Ber, It would help a great deal to know what vehicle and the year of manufacture we're talking about. Modern vehicles use the speed sensor to actuate the gear change on auto boxes. take the vehicle for a diagnostic scan. Have the speedo repaired and you will probably have the vehicle back to being faithful again. Regards John

Sep 09, 2012 | Cars & Trucks

1 Answer

Speedometer stops displaying then the car runs very erratic... pull over and stop... the problem goes away, continue driving for a while then problem comes back


Your car is equipped with a speed sensor. When this sensor goes out it will cause the vehicle to run erratically and shift up and own at all the incorrect speeds and RPM's. Have your speed sensor checked. I'm sure that is the problem.

Sep 02, 2011 | 1998 Ford Taurus

1 Answer

O.D light blinks, won't shift, runs rough at low rpms 2003 F-150


This is likely your electronic speed sensor. On my 2003 F150 it would rev quite high before finally shifting into 2nd. and my O.D light would blink also. The speed sensor is located under the vehicle about halfway back on the frame on the passenger side. The part costs about $70 and is a fairly easy repair.

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1 Answer

I have a 2002 kia sedona and occacionly the car jumps while i am driving and then runs very rough...I have learned that when i shut the car off and turn it back on it seems to run normal again


Sounds like either an input or an output shaft speed sensor. In a nut shell, the transmission's shifting is controlled electronically; at a stop or very slow speed, the transmission is automatically in first gear...when these sensors 'sense' that the vehicle is travelling at a certain speed, it tells the transmission to shift into second. At the next specified speed, it shifts into third; etc. etc. What it sounds like is that one of these sensors is going bad, telling the transmission to downshift, but the other sensor is fighting that command and causing the vehicle to 'act' like it's running rough, when in reality it's probably just the transmission rapidly jumping between gears. These sensors aren't particularly cheap, but are pretty easy to replace. Start by finding a shop that will plug in a code reader for you (or do it yourself if you have one). You're looking for a code in the range of 0715 to 0723. If it reads 0715 to 0718, that's the input side. 0720 to 0723 is the output side. Good luck.

Jul 05, 2009 | 2002 Kia Sedona

1 Answer

86 Grandprix it shifts gears to fast andI get no torque


get it scanned for soft codes.... likely a VSS (vehicle speed sensor) out or shift solenoids for trans

Dec 23, 2008 | 1986 Pontiac Grand Prix

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