Question about 1997 Chevrolet Tahoe

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Changed my vss in a 97 tahoe, now in limp home mode, how do I fix it?

The problem was the shift solinoids we thought, that didnt work, we then changed the vss and realized we are in limp mode. :( We really need to have this vehicle fixed but affraid to drive it

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  •  michelle F
    michelle F Jan 20, 2013

    VSS Vehicle Speed Sensor(transmission)

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  • Chevrolet Master
  • 3,103 Answers

Ok im stupid whats vss...repost

Posted on Jan 20, 2013

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Posted on Jan 02, 2017

  • 91 Answers

SOURCE: 2001 automatic chevy truck Z71 not shifting out of 2nd gear

1 st did you fill the transmission after radiator replace ment some lines go to the rad. when you loose fluid it needs to be added and checked. Other wise it sounds like a trans needs to bo serviced.

Posted on Apr 27, 2009

  • 91 Answers

SOURCE: po 751 code 99 tahoe

The solenoids are located in the transmission. There is one for the 1-2 shift point, one for the 2-3 shift point, and one for the 3-4 shift point. You have to drop the transmission pan to access them.

Posted on Apr 10, 2009

  • 2 Answers

SOURCE: vehical stuck in limp mode

This only applies if you have an allison transmission, which based on the problem you are reporting I would guess that you do.

It sounds like your vehicle is stuck in limp mode. This is probably due to a bad NSBU switch(Neutral, saftey, back up) (if you have an allison transmission. Prior to 2002 the NSBU switches had a very poor seal which resulted in water intrusion into the NSBU switch causing corrosion. If the switch is corroded it is likley confusing your transmission. Unfortunatly you cannot repair the bad switch, it needs to be replaced. If you order one through Chevy it will cost around 200 dollars. I found one at merchant Automotive for 91 dollars. ( http://www.merchant-automotive.com/allisonnsbuswitch2001-2004.aspx ).

The switch is relativly easy to replace. the electrical connections are the hardest part as they are glued into the switch. A little heat from a butane torch should soften it up and make the connectors slide off more easily. Other wise you may have to break the NSBU switch appart to remove the connectors.

I replaced the switch for the first time and it took me 15 minutes.

Posted on Apr 22, 2009

rehavoc_618
  • 7 Answers

SOURCE: 1997 TAHOE 4WD

try the transfer case control module that is located under the dash between drivers door and steering column

Posted on Nov 22, 2012

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1 Answer

1996 Dodge stratus es automatic wont shift outta low gear .is this a sensor issue?


probably not if it is limp mode
the ECM puts the car in limp mode to prevent serious problems in the engine or transmission
could be no coolant, sump oil , transmission oil etc
run the fault codes and find the reason for the mode

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You may not be able to come out of limp mode until the problem the computer is seeing is repaired. The computer determines if something is affecting proper engine/transmission operation and for safety implements LIMP mode to protect other operating systems from possible damage. Do a diagnostic scan and repair the problem

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Po715 automatic transmission most of the time it don't want to go to the other gears stays in first gear


This is cause by three things. 1. Low fluid causing difficult shifting. 2. Bad electronics in the 1,2, shift circuit. Or the transmission is in limp mode. The transmission can go into limp mode for several reasons. Try removing the gas cap, sometimes the evap system will cause issues. Also get the car to normal operating temperature and check the trans fluid, add as necessary, do not overfill.

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CODE PO871


First thing tomorrow, take it back to the shop that rebuilt it!!

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01 eclipse gt auto transmission went bad,put in 04 eclipse auto and had solenoids and nuetral safety switch changed,shifts from first to second then locks in limp 3rd with 4 solenoid codes coming up on...


did you change the powertrain control module with the trans?? if not thats probably where the problem lies, ive saw many people get mad and agervated just to realize they had to change the computer for trans with it..... just a thought.

Nov 29, 2010 | 2001 Mitsubishi Eclipse

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1996 gmc jimmy will not shift to 3rd gear


Hi, It may be in LIMP mode.

What is "limp-home mode" ? This is a fault mode in which the transmission either loses electrical power or the PCM deactivates all of the electronics. The transmission will default to max line pressure. The driver will have Reverse and 3rd, with manual 2nd available by putting the gearshift in 2 or 1 (doesn't matter). 1st, 4th, and TCC lockup will not be available. It will not hurt the car to drive it like this for short periods, but use manual 2nd to get the car moving, and be aware that the trans will generate more heat than normal while operating in limp-home mode due to increased torque converter slippage during 2nd gear starts and no lockup in 3rd gear.

Common failures on 4L60E, symptom any possible repair:

Trans shifts into gear harshly, car feels sluggish off the line, No 1st, 4th or TCC lockup available, Manual 2nd, 3rd and Reverse are only available gears, CEL is on: Transmission is either in limp-home mode or has lost electrical power. If there are lots of error codes in the PCM, check the under-hood fuse that powers the transmission, and if it pops again, look for a short in that circuit like an O2 sensor harness touching exhaust. Otherwise, check PCM codes for a particular fault in the transmission causing the PCM to put it in limp-home mode.

No 1st or 4th available; trans shifts 2nd to 3rd by itself in D or OD and locks the converter :ShiftA solenoid failed. Easy fix in the pan. Or a wiring problem from PCM to trans.. or PCM.

Car goes into gear but feels very sluggish like the brakes are dragging, but it will roll easily (starts out in 4th gear), you manually shift to 2 to get it moving, once it's moving you put it back in OD and the car shifts 3rd to 4th on its own and locks the converter at the appropriate time: ShiftB solenoid failed: Easy fix in the pan. Or a wiring problem from PCM to trans.. or PCM.

Trans seems noisy when moving in 1st and Reverse, noise goes away instantly if you shift to N or the trans goes into 3rd gear: Reaction planetary is worn out due to high miles or insufficient lubrication. Not a critical failure, but not a good sign either. R&R sooner rather than later.

3rd gear starts, can manually shift through all gears. When car has been turned off for a bit, then back on it will run normally.: VSS dropoff w/ Hi-stall converter. The rpms are too high, but VSS is showing no movement. Happens after a tire burning take-off. Doesn't store a code, will not throw a CEL (I've heard that it will store a code if it happens 3 or more times). Cure: Reprogram PCM for VSS dropoff -- PCMforLess knows about it.

If you can get the Jimmy for no more then $500.00 and the engine sounds good and body is good, you may want to invest in the repair of the jimmy. Also note that to have a close look at the fuel line along the frame on the drivers side just by the back doors, the line is know to corroded there on all the SUV's

Sep 19, 2010 | 1996 GMC Jimmy

1 Answer

My GMC has 311632 miles on it. I just changed the 4L60E transmission a few months ago and now it wont shift out of first unless I manually put it in second gear. all the gears from park rev. nuetral works...


The transmission may be in Limp mode. The transmission is on the same fuse as the MAF, O2 sensors and at least one other sensor - if an O2 shorts out, it will blow the fuse and the trans will go into limp-home mode. Be sure the trans has power and the fuse is not blown before doing anything else.

What is "limp-home mode" ? This is a fault mode in which the transmission either loses electrical power or the PCM deactivates all of the electronics. The transmission will default to max line pressure. The driver will have Reverse and 3rd, with manual 2nd available by putting the gearshift in 2 or 1 (doesn't matter). 1st, 4th, and TCC lockup will not be available. It will not hurt the car to drive it like this for short periods, but use manual 2nd to get the car moving, and be aware that the trans will generate more heat than normal while operating in limp-home mode due to increased torque converter slippage during 2nd gear starts and no lockup in 3rd gear.

Trans does not upshift out of first, speedometer reads zero at all times: VSS failure. Easy fix on rear of transmission, but xmember must come out to access VSS.

Car goes into gear but feels very sluggish like the brakes are dragging, but it will roll easily (starts out in 4th gear), you manually shift to 2 to get it moving, once it's moving you put it back in OD and the car shifts 3rd to 4th on its own and locks the converter at the appropriate time: ShiftB solenoid failed: Easy fix in the pan. Or a wiring problem from PCM to trans.. or PCM.

No 1st or 4th available; trans shifts 2nd to 3rd by itself in D or OD and locks the converter : ShiftA solenoid failed. Easy fix in the pan. Or a wiring problem from PCM to trans.. or PCM.

Transmission does not shift automatically, only manually. Swap in a known-good PCM, check wiring, check other sensors such as VSS and TPS.

3rd gear starts, can manually shift through all gears. When car has been turned off for a bit, then back on it will run normally.: VSS dropoff w/ Hi-stall converter. The rpms are too high, but VSS is showing no movement. Happens after a tire burning take-off. Doesn't store a code, will not throw a CEL (I've heard that it will store a code if it happens 3 or more times). Cure: Reprogram PCM for VSS dropoff -- PCMforLess knows about it.

Here are just some of the common things you have described with the issues your transmission has. Good luck and keep me posted.

Dec 22, 2009 | 1994 GMC Sierra

2 Answers

In limp mode cant get out 96 dodge avenger ES V6


unhook the battery for about 15 minutes and hook it back up... that should reset it

Jan 23, 2009 | 1998 Dodge Avenger

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