gunther4272001 Posted July 23, 2014 Share Posted July 23, 2014 My 1998 Legacy Outback is showing a p0740 code, the check engine light will come on for around four start cycles then goes back off. Comes back on again after a few more start cycles any ideas Link to comment Share on other sites More sharing options...
john in KY Posted July 23, 2014 Share Posted July 23, 2014 http://www.obd-codes.com/p0740 Link to comment Share on other sites More sharing options...
MilesFox Posted July 23, 2014 Share Posted July 23, 2014 The code is related tot he torque converter lock-up solenoid. Link to comment Share on other sites More sharing options...
Fairtax4me Posted July 23, 2014 Share Posted July 23, 2014 (edited) Possibly the wiring for the TCC solenoid inside the trans is chafed or pinched and is shorting. Very little clearance between the pan and the valve body and there are several wires and solenoids in there that can be damaged if something pushes against the pan. I would unplug the large connector for the trans wire harness up by the firewall and check for corrosion there first. Then check the harness where it runs down the side of the trans for chafed wires. If that's clean the pan will probably need to be dropped to check the wiring inside the trans. Edited July 23, 2014 by Fairtax4me Link to comment Share on other sites More sharing options...
johnceggleston Posted July 23, 2014 Share Posted July 23, 2014 is the oil pan on the trans dented?????? Link to comment Share on other sites More sharing options...
gunther4272001 Posted July 24, 2014 Author Share Posted July 24, 2014 doesnt look dented and is now not shifting to overdrive. someone told me to check the tps sensor dont see how that would do anything never know though Link to comment Share on other sites More sharing options...
gunther4272001 Posted July 26, 2014 Author Share Posted July 26, 2014 changed the tps sensor and the light went out and shifted into overdrive again. light hasnt came back on but stopped shifting into overdrive again could there be a code stored in the computer? Link to comment Share on other sites More sharing options...
Fairtax4me Posted July 26, 2014 Share Posted July 26, 2014 Possibly a fault with the TCC solenoid in the trans. I still think you need to pull the pan. You won't get circuit fault codes for the lockup solenoid because of the TPS. Link to comment Share on other sites More sharing options...
gunther4272001 Posted July 26, 2014 Author Share Posted July 26, 2014 (edited) just seemed funny changed the tps the light went out and was shifting again. hasnt came back on since usually comes back on within a few starts Edited July 26, 2014 by gunther4272001 Link to comment Share on other sites More sharing options...
gunther4272001 Posted August 15, 2014 Author Share Posted August 15, 2014 the trans started shifting again but does it intermittingly will shift fine for short times then stops. Transmission guy said sounds like a wiring problem any ideas where to start at Link to comment Share on other sites More sharing options...
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