P 0740 transmission code - JeepForum.com
Sign Up   Today's Posts
User: Pass: Remember?
Advertise Here
Jeep Home Jeep Forum Jeep Classifieds Jeep Registry JeepSpace Jeep Reviews Jeep Gallery Jeep Clubs Jeep Groups Jeep Videos Jeep Events Jeep Articles
Go Back JeepForum.com > Models > Jeep Grand Cherokee & Commander Forums > WJ Grand Cherokee Forum > P 0740 transmission code

Advance Adapters SYE KitsFS: Jeep Fog Light LED Bulbs! Several Brightness Options! Rough Country Lift Kits and Parts!

Unread 12-20-2013, 12:16 PM   #1
Registered User
2002 WJ 
Join Date: Apr 2011
Location: Bakersfield, California
Posts: 305
Wj P 0740 transmission code

Just the other day on the highway my jeep decided to turn on the check engine light.

Checked the odometer code, got a p 0700, so I took it to get the codes read and discovered its a p 0740 which is a torque converter lockup malfunction code. The ODB II meter also said it was an open circuit.

I have no huge symptoms other than the transmission not shifting all the way into overdrive sometimes, or taking a long time to shift into overdrive.

Transmission fluid level is good, and it doesn't smell burnt.

What are some easy things to check first?

My Build Thread for the old WJ
justn is offline   Reply With Quote
Unread 12-22-2013, 08:36 PM   #2
Registered User
2001 WJ 
Join Date: Nov 2013
Location: Provo, UT
Posts: 95
check the transmission relay and make sure it works properly
link375 is offline   Reply With Quote
Unread 12-23-2013, 09:01 AM   #3
Double E
2000 Laredo V8
Double E's Avatar
2000 WJ 
Join Date: Oct 2003
Location: Raleigh, NC
Posts: 3,503
Test your input sensors: http://www.jeepforum.com/forum/f13/s...ailure-561977/
2000 Laredo 4.7L Selec-Trac. 177K miles, Leather, 245 tires, tow package, crappy CD changer, full size spare, roof cross-rails & sunroof.
Changes & fixes: Rear Addco sway bar & greasble bushings, upgraded headlights, upgraded tail lights, new hood struts (replaced 2X), new rear hatchglass struts, new radiator (replaced 3X), new oil pressure sending unit (replaced 4X), 2 new speed sensors, 2 new door lock actuators, new ignition key cylinder, chrome front tow hooks, Mobil 1 Synthetic 5/30, Purolator Pure One oil filter, EBC slotted & dimpled rotors, EBC Greenstuff pads, new front shocks (replaced 3X), new rear shocks (replaced 2X), new IRO steering stabilizer, new timing chain cover, new water pump, thermostat, new thermostat housing, new high pressure power steering hose, Michelin-X radials, new sunroof assembly, new single-piece lug nuts, new exhaust manifold studs & gasket on driver's side, new Durango alternator. Jeepforum.com sticker, Visit cobaltboatsforum.com when you can!
Double E is offline   Reply With Quote

Jeep, Wrangler, Cherokee, Grand Cherokee, and other models are copyrighted and trademarked to Jeep/Chrysler Corporation. JeepForum.com is not in any way associated with Jeep or the Chrysler Corp.