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Old 05-24-2019, 01:12 PM   #1
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Governor / Speed limiter 2000 GMC 3500 5.7

I tried the search function but didn't see what I was looking for, maybe you can help me out? I have a 2000 GMC Savanna 3500 with a Thomas Minotaur 29 passenger body. 5.7L gas engine. It won't go more than 60 or 65 mph. Is the speed limited in the ecm where I could over ride it with a programmer, or is it an external governor of some sort?
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Old 05-25-2019, 08:27 AM   #2
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Join Date: Mar 2018
Location: Fingerlakes region NY
Posts: 190
Year: 1999
Coachwork: AmTran/Wolfington
Chassis: 3800
Engine: International DT466E 190HP variant
Rated Cap: 72 pax 29500 GVWR
Itíll be limited in the ECM. Factory GM trucks used to be limited by the ECM to 100 mph. The bus manufacturer probably had the ECM reprogrammed for 65.

That being said does it accelerate all the way to 60mph and then even with your foot down drop off? If the RPMs drop once you hit 65 itís a limiter. If the bus is just incapable of hitting 70 then you have a mechanical issue that needs addressing.
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