Speedometer quit, transmission not shifting right

2000 GMC SAVANA
145,000 MILES • 4.3L • V6 • 2WD • AUTOMATIC
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DANIEL CHIS
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The van sat unused for about two months. When i wanted to start it,after a few cranks, battery gave up. I hooked up my battery charger to battery on " cranking mode, 225 amp " and started the engine. Shortly after starting to drive, i noticed that speedometer was acting crazy, 70 /90 mi an hour driving in the residential area. Then, when i got on a bigger road, i noticed that the transmission was not shifting right. Also the abs light came on in the dash. Than the speedometer quit completely. When i reached approximately 45 mph, engine cut off ! When speed dropped some, engine cut back on. I think that the engine is in some kind of limp mode. Won't go over about 45 mi/hour. Had it checked for any codes with a obd ii .no codes !!! I replaced the VSS sensor on the back of the transmission, noting happened. Acting the same. Also i noticed that the odometer, some how changed and now shows km instead of mi . I am mechanically savvy, but separated from the profession for more than 30 years. I would appreciate any suggestions/help at this time. Thank you. ( all fuses are okay. Engine runs good until the van riches about 45 mph. Then feels like engine lost power/no acceleration, until speed drops and then catches on again. Transmission shifting is bad all the time. )
Aug 23, 2019 at 4:03 PM
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STRAILER
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Hello,

This is common when the cluster goes out and need to be replaced/rebuilt. Here is a video that show the job being done on a similar car:

https://youtu.be/_HEC44xENxw

Please run down this guide and report back.

Aug 26, 2019 at 1:34 PM
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DANIEL CHIS
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Wow !! Thank you. I will have to order a new instrument cluster, replace it and will report back to you.
Aug 26, 2019 at 7:33 PM
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STRAILER
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Sounds good, please let us know.
Aug 27, 2019 at 11:09 AM
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DANIEL CHIS
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Got it fixed. It was not the instrument cluster. Had to replace the PCM/ECM . Thank for your help.
Sep 8, 2019 at 11:17 AM
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STRAILER
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Glad you could get it fixed, that kind of problem can be tough. Please use 2CarPros anytime we are here to help.
Sep 9, 2019 at 10:57 AM