Question about 2003 GMC Sierra 2500HD

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Transmission shifting When I attempt to "kick it in the ****" at speed hoping it would drop into a passing gear, the truck acts like it wants to, but then just "dogs down" unless I back off the accelerator. What could be causing this? Someone told me it may be oil filter?

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Bring the vehicle to a transmission repair shop there they will scann the vehicle for codes and do the repairs that the codes list.
By your write up I would like to pressure test the main line pressure before I say anything.
I'm hoping its the shift solenoids.
Good luck

Posted on May 07, 2010

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Travelling at 100 klh @ 2000 revs kicked down in Polo-revs up to 4500 but would not move up gear(s)


run the fault codes to check for TCM or other problem sensor in the transmission. It may be a protection item as it is unwise to kick down at that speed as kickdowns are used to change to lower gears when going up hill or pulling a load and need a lower gear . They are not meant to pass at speed .It is the same effect bas with a manual in overdrive at 100klms and suddenly shifting into 1st gear

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When car warms up the speedometer goes up and down and transmission shifts funny and the engine cuts off


If the speedometer suddenly drops back and then returns to being close to your actual speed and the transmission shift or acts up at the same time this is happening then you may have a failing Vehicle Speed Sensor, usually refered to as a VSS. This sensor tells the engine computer, instrument cluster, and transmission controller how fast you are going so the controller can select the proper gear for the transmission to be in. If the speed signal is lost, wrong, or erratic then the transmission may make a quick downshift to to try and match this new, but incorrect, speed and then may make an equally quick upshift to rematch the correct speed once the signal is correct again. This should be an easy one for anyone with a good scan tool to check out as the actual speed reading signal can be observed during a test drive and it's usually pretty easy to spot the glitches. Good luck, hope this helps!

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Theres a button on the automatic stick what is it


That may be your overdrive button, try cruising at a steady safe speed and depress the button, you will feel a shifting motion on transmission and OD light may come ON on dashboard, this shifts your tranny to a lower gear when more power is needed without pressing gas pedal so hard that passing gear kicks in.

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My 2004 Tahoe is not shifting in to gear unless I come off the gas some. The speed dail started to stick before this issue started. any ideals.


Instead of a cable, most vehicle's speedometers are controlled by a speed sensor at the tail of the transmission. These do go bad and would cause your speedometer to malfunction. They are not like light bulbs which just die, these sensors will kick in and out irregularly.Secondly you have a thin cable that is connected to your throttle in addition to the throttle cable itself. This second cable is for the kick-down of your transmission. It is utilized when you make a sudden pass of another vehicle to shift down one gear. This cable becomes misaligned at times and will, in a sense, become shortened. Try releasing it from the throttle cam and see how your vehicle reacts then. If it shifts correctly than you need a new kick-down cable.

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Overdrive factors


When the car is just cruising along at approx.50+ MPH push the O/D button. You should feel the gears change higher and if you have an RPM guage then it should drop as well to fewer RPMs. This would be normal driving conditions. O/D will not kick in until the last regular gear (3rd or 4th depending on model)  had been shifted into. O/D automatically kicks out when slowing down and the transmission shifts to a lower gear. Thus the O/D has no function at slower speeds/gears and does not need to be shifted ( on or off ) except in the very first example given here.

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1 Answer

Not shifting into passing gear


hi passing gear is actually your transmision drpping down to second gear.if you hit the gas hard.if you hit the gas lightly it will only drop out of overdrive and go into third and not go into passing gear.

Feb 06, 2009 | 2001 GMC Sierra 2500HD

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