Question about 2001 Dodge Ram 2500 Truck

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2002 Dodge 2500 diesel auto

Can anybody tell me why my truck would shift in and out of lockup when the torque converter locks in around 40-50 mph in overdrive?
Thx

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  • jumper9954 Nov 19, 2008

    My 2002 has the same problem. It only happens on light load.

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Could be a bad lockup solenoid or a bad torque converter

Posted on Aug 28, 2008

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Trans axle humming noise


If you go really easy on the gas you should hear & feel
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You should also feel converter clutch lock-up when in
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You can lightly hold the brake down & the (TCC) Torque Converter
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That is the speed when it would normally shift into overdrive or the torque converter would go into lockup.
It is also when the engine would be working hard and a slight miss could be magnified.
You may want to have a transmission shop test drive it for their opinion.

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It seems as though your electronic "lock up" on the torque converter is not actuating. TCC lockup/Torque Converter Clutch lockup.

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Wont shift into overdrive


Good chance that your TCC (Torque Converter Clutch Solenoid) has gone bad and will need to be replaced. Go to Auto Zone and have them scan the van for the DTC codes, I think the DTC code will be P0740. I looked this up and it's "Torque Converter Clutch lockup"

To check for Converter Clutch lock up, when you are going down the highway about 55 MPH, tap the brake pedal with your lefty foot just enough to make the brake lights come on but not enough to apply the brakes as you keep the gas peddle at the same position. You should get/feel about a 300 RPM rise in the engine. If you don't, then the clutch didn't lock up.

Good luck and thank you for using fixya.

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