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Old 07-13-2008, 05:34 PM
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1998 gmc tranny problems

Hi everyone I really hope someone can help me I have a 1998 gmc jimmy the tranny will not shift into overdrive and will not start out in first gear unless you hammer down on the trottle I have changed both shift solenoids and i still have the same problem my check engine light is on and the airbag light comes on and off and the fuel gauge stopped working and kind of help will be great thank you

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Old 07-13-2008, 05:49 PM
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moving to tranny forum
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Old 07-13-2008, 06:41 PM
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re: trans problem

i have come across this problem in the past im not sure if i replace the ignition switch or the cluster or both
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Old 07-13-2008, 07:27 PM
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well another thing I have noticed is that my flaser relay clicks even when i dont have my turn signal on so I just pulled that out do you think that has anything to do with it
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Old 07-14-2008, 03:25 AM
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thats a possibility you outta check your elecs first! But i remember fixing a similar vehicle with the same problem and it turned out that there was thec bulletin out for the ignition switch,cluster! Have it scanned check for codes. refer to the snap on troubleshooter.
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Old 07-14-2008, 01:55 PM
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I did scan it for codes and i got a 753 and a 1860 code
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Old 07-15-2008, 03:49 PM
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98 gmc

1860 is converter clutch code,753 i"ll have to look up. Asta mannana!
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Old 07-15-2008, 06:45 PM
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Quote:
Originally Posted by FURYISH69
I did scan it for codes and i got a 753 and a 1860 code

I am not familiar with the code 1860.

A common code of 1870 is a converter clutch slip code.
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Old 07-15-2008, 07:50 PM
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do ya think that would have anything to do with my fuel gage and air bag light or would that be another problem
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Old 07-16-2008, 04:12 AM
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Here's a link for trouble codes. Your codes show 2 electrical issues.

"753 shift solenoid A circuit electrical "
"1860 TCC PWM solenoid circuit electrical"

http://www.gmtuners.com/OBD2_FWD_V6_DTC.htm
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Old 07-16-2008, 01:57 PM
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does anyone know where the tcc solenoid is located at?
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Old 07-16-2008, 03:46 PM
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gmc prob,,

both are located in the trans you have to drop the pan, i have never replace both soleniods at once! Again you may want to replace your ignition switch (electrical) not the key part! Its not expensive. I,ve had to replace one for the same symtons, another thing you want check is your battery cables, make shure that their not corroded, also not expensive. Good luck!
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Old 07-16-2008, 05:55 PM
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Where is the iginition switch located and that fix the light problem and the shifting promblem
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Old 07-16-2008, 06:46 PM
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98 gmc

Your ignition switch is located on the steering column under the dash! And yes it will most likely fix your problem.....
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Old 07-16-2008, 08:36 PM
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There's a post on here with a Hummer with the same problem and it was the ignition switch.
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