fault code P0740 - JeepForum.com
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post #1 of 3 Old 10-22-2010, 02:31 PM Thread Starter
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2001 TJ Wrangler 
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Location: tyler, TX
Posts: 211
fault code P0740

says its the torque converter circuit malfunction. engine light came on during one of the violent shaking after i lifted. it seems to be running rough now. anyone got idea what this is or what problem could be?

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post #2 of 3 Old 10-22-2010, 02:40 PM
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Location: Winchester
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The torque converter solenoid is unpluged, or the wires are cut, or grounded against the body, or solenoid is bad, etc.

The connector is on the rear of the tranny. It's a 2-pin connector, held on with a metal clip. To disconnect it (if it's plugged in), push inward on the metal clip, while pulling the plug off. It looks like this metal clip needs to come off, but it doesn't... just push it inward.

If the plug is connected, pull it off and spray some contact cleaner on the pins (both sides), and re-connect. If that doesn't work, trace these wires back and see if they may be cut somewhere and/or a plug is connected up the line (won't hurt to clean those contacts neither).

If the solenoid is bad, it's a fairly simple fix at home. It's accessible when you take the pan off (change the filter/oil while you're in there). Follow the procedure for changing the filter, and you'll see it in there by following the wires. I don't think that's your problem tho... You're plug is probably disconnected.

2001 TJ; 1999 XJ; 1993 ZJ

Last edited by Yuri; 10-22-2010 at 02:49 PM. Reason: added content
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post #3 of 3 Old 10-22-2010, 02:57 PM Thread Starter
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Location: tyler, TX
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awesome maybe became disconnected during shaking? ill check this out here in a bit. u got a pic of what it looks like?

& wheres the solenoid? hard/expensive to replace?
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