Question about 1993 GMC Sierra K1500

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I have a 1993 GMC 1500, I though the tranny was bad so I replaced it, also replaced the ecm and the instument cluster. It will manually shift into 1st and 2nd but when I go to 3rd the gas hand goes wacky as it did before I changed the tranny and everything else. I know it is electrical, but what?

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Did you reset your ECM ? When installed. This is where i would start. good luck,

Posted on Apr 06, 2011

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Tack and speedometer quit working, won't shift into overdrive


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Nov 09, 2013 | 1999 Chevrolet Silverado 1500

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2001 kia sephia slips out of gear. Trouble codes P1500, P1624, P0740.


Low fluid or too much ATF? (foaming it up and killing bearings)

p07xx is tranny DTC codes. (errors)
TCC lockup failure. (the TCM commanded the lock and
the tail shaft sensor did not rise in RPM
that is the engine RPM does not match tail RPM or 1:1 ratio.
which is LOCK ratio.

1500 is speed sensor , reads wrong,
No Vehicle Speed Signal to TCM.

1624 means.
MIL Request Signal from TCM to ECM.
the means simply the Tcm SAW and error and sent that error up stream to ECM. creating 1500.
remember the ECU never knows what part is bad.
NEVER ! it only knows, the tests failed. (monitors)
the first thing i do is find out which VSS failed.
on some cars there are 2 to 5
the first speed sensor is RPM does the scan tool show correct engine RPM? y/n
if yes,
does the scan-tool show correct MPH? sensor 2.
y/n if not fix that first.
the TCM function (tranny brain must not be lied to, in this order)
engine RPM , MPH.
and last the tranny its self as VSS (rpm) sensors. 1 to3.
my guess, (too lazy to look it up) has 1 sensor on the tranny tail.
if all is good and 1500 means VSS 2 tranny tail is fibbing.
then its one of 3 things.
(all others good)REMEMBER the TCM does comparisons to all speed sensors to shift the car correctly so the front sensor count first. then last the rear.
VSS2 lies. this is bad bad tranny (slips) bad wires to VSS2 or bad VSS2.
most TCM go to limp home when the tranny slips to stop burning up the clutch packs. may skip gears too.

now what does slips out of gear mean. a neutral FLARE?
or down shifts,
if the tranny ever slips. this is bad news.
if it does slip 1500 is only the warning that it did
it say RPMs go out of control and threw 1500 pronto.

Try to think(sic) like a TCM what would you do if the tranny malfs.
answer, throws codes.
and goes to limphome, if necessary, (FSM show these facts)
so does alldata dot com
what i do is try to get tranny to slip. using all gears.
if it slips ,its bad.
The TCM can not run a slipping tranny.
the TC does slip, but the TCM has that all figured out. (modeled)
not locked, and locked it must not.
good luck and do ask questions.

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1994 GMC 1500 Sierra has to rev up 1st gear and let off to get to shift from 1st to 3rd gear. Had tranny rebuilt. Could problem be solved by changing the ECM Engine Control Module or Transmission...


If reverse is ok then you have a bad shift solenoid b.There are two solenoids on the back of the valve body that are identical,it will be the one on the pasenger side.GM calls them the 1-2 and 2-3 shift solenoid but this is deceptive because it takes a combination of them being on or off to achieve every gear.Pull the pan, disconnect solenoids and check resistance across them with a volt meter.I think you are looking for less than 20 ohms but the bad one will be off the chart.Bad transmission controllers are very rare in a GM vehicle.I bet if you have codes pulled you will find a shift solenoid code.Good luck!

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i have a 93 gmc seirra 4x4 it did the same thing there is a big problem with the shifting silinoid that goes bad mine wouldnt shift in to second gear so i took it 2 my uncles garage and the first to second silinoid was bad so i would check that first b4 u took it 2 a tranny shop

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See if the tranny has an exterior modulator valve. If so remove the vacuum line and see if there is tranny fluid in the line. It will be located on the pasenger side rear of the tranny. What's happening is the engine is sucking tranny fluid through the vacuum line directly into the intake and it doesn't burn well.

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1 Answer

1993 GMC 1500 4x4 poor shifting


this may be due to a poor connection at the vehicle speed sensor on the transmission, pull the connector off the sensor and clean it with contact cleaner, if the problem persists replace the speed sensor. there are 2 diff ones here is a picture of the most common one for an auto trans.3deea43.jpg

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