4HP22 Failures
The 4HP22 transmission can be rendered undriveable when held on P or N setting and too high engine rotation speed is applied for too long, for instance during emissions testing. Examples of situations that could lead to transmission failure include warming up the catalytic converter on petrol engine-powered vehicle with too high RPM, or while measuring amount of smoke on diesel engine-powered vehicle and keeping the throttle full for too long time.
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