Jeep bucking and Check Engine light came on with these codes please help - Jeep Wrangler Forum
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Old 03-04-2010, 09:46 AM   #1
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Jeep bucking and Check Engine light came on with these codes please help

so my check engine came on with these codes can someone please explain whey they mean. this is what it says in my FSM but i still dont understand what to look for or what to do thanks.

SYMPTOMS = off the line my jeep bucks and feels like the trans is slipping i have the 32rh. so idk if it the torque converter, bands, or anything else. and when it shifts it sounds like its in neutral for a second or two than engages

P0740 (M)
Scan tool Display = Torq Con Clu, No RPM Drop at Lockup
Brief Description of DTC = Relationship between engine and vehicle speeds indicated failure of torque convertor clutch lock-up system (TCC/PTU solenoid)

P0743 (M)
Scan tool Display = Torque Converter Clutch Solenoid/Trans Relay Circuits
Brief Description of DTC = An open or shorted condition detected in the torque converter clutch (part throttle unlock) solenoid control circuit. Shift solenoid C electrical fault - Aisin transmission

P0743 (M)
Scan tool Display = Torque Converter Clutch Solenoid/Trans Relay Circuits
Brief Description of DTC = An open or shorted condition detected in the torqueconverter part throttle unlock solenoid control circuit (3 or 4-speed auto. trans. only).

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Old 03-04-2010, 10:51 AM   #2
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Something tells me it may be the Torque Converter Clutch Solenoid. I wish I could help, but I don't even know what that is. Send a PM to Jerry B, I'm sure he knows exactly what to do.

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Old 03-08-2011, 01:04 PM   #3
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the 2-wire plug for the solenoid is on the back of the tranny. you have to remove the pan to change the solenoid. drop the skid plate, siphon the fluid out of the tranny through the dipstick tube or start loosening at one corner and work from there to drain into a pan. remove the filter (might as well replace it while your there anyways and most come with the gasket) and there should be one 10mm bolt holding it in place if memory serves me. its an inexpensive part.
once you are reassembled, disconnect the battery ground for a few to clear the codes then fire it up. be sure to refill the tranny first of course.
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Old 02-09-2012, 01:31 AM   #4
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What size of tire and gears are you running? The TCC only engages during cruising at Highway speed. If you have too big of tires with high gears such as stock gearing it puts alot of stress on the TCC. If this is the case the clutches are probably toast, if not its probably your solenoid. If its your solenoid though your clutches are also probably gone due to lack of pressure, causing the clutches to slip. So either way one or both are bad. Have you done a tranny flush lately?
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