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Message: <blockquote data-quote="alantiong" data-source="post: 624319" data-attributes="member: 19754">very unlikely the tcu error.. if it stucked in 3rd gear... it has to be along the pressure line.valve body controls the pressure.. and solenoid activates the on/off.  and of course.. and pressure switch..  these three elements controls the whole sequence of gear change..i guess the best thing to do is to send it in for a bench test.. EH in kepong does that.. they take out the whole gb and put it on a bench test and real time diagnostic...seems like u have a blocked valve body... if that is the case.. EH can do a ultrasonic cleaning.. they dun tell you though.</blockquote>