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A couple things can cause a computer controlled auto transmission to shift hard:
1. the speed sensor can be disconnected or not functioning properly.
2. the computer may have detected a transmission fault that caused the computer to put the transmission into "safe" operation mode. When it does that it causes a condition called "high line", meaning high hydraulic line pressure, which forces hard shifts in an attempt to save clutches that might otherwise be damaged if something is not functioning properly in the transmission.
Unfortunately, this is one of those situations that you'll probably need to take the vehicle to a specialist; either a transmission shop or the dealer.
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∙ 15y ago
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