post #1 of Old 12-20-2013, 12:16 PM Thread Starter
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2002 WJ 
Join Date: Apr 2011
Location: Bakersfield
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
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post #2 of Old 12-22-2013, 08:36 PM
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2001 WJ 
Join Date: Nov 2013
Location: Provo
Posts: 95
check the transmission relay and make sure it works properly
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post #3 of Old 12-23-2013, 09:01 AM
Double E
2000 Laredo V8
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2000 WJ 
Join Date: Oct 2003
Location: Raleigh, NC
Posts: 4,569
Test your input sensors:

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. sticker, Visit when you can!
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