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?

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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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I think this is an electronic trans with no modulator. Overdrive is really not a gear but rather torque converter lockup. Torque converter may have completely failed.

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The lockup converter will only drop the engine speed about
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There is no part called the lockup sensor, the lock up occurs when the Vehicle speed sensor sends a signal to the Transmission control module that the truck has reached the minimum speed and throttle angle for lock up to take place, it then activates a switch inside the transmission that locks up the torque converter clutch.

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Trans axle humming noise

If you go really easy on the gas you should hear & feel
all 4 or 5 gears shift,whichever you have

You should also feel converter clutch lock-up when in
the top gear, which you call overdrive.
That will occur around 40 mph if you stay steady on the gas

You can lightly hold the brake down & the (TCC) Torque Converter
should unlock & the engine RPM go up

I suspect you have no lockup thus wrong dash speed indicated

That will eventually over heat the trans

You get lock-up in other gears under certain load conditions

You could have a bad solenoid in transaxle & any other sensors
that play a role in shift strategy

Sep 28, 2012 | 1998 Oldsmobile 88

1 Answer

1995 oldsmobile- car makes a surging or jerking at 45 mph

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.

Aug 21, 2012 | 1995 Oldsmobile Eighty Eight

1 Answer

Transmission light on. Rpm go to 3000 when I'm doing not going into 4th gear (overdrive) what's wrong with my truck?

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

Oct 05, 2010 | 1996 Dodge Ram 1500 Club Cab

1 Answer

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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My speedometer broke which in some didn't send a signal to the transmission that it had to be cooled. I burned up 2 transmissions in less 3 days...this is related to lockup....Can someone tell me what...

Lock up is a feature within the transmission torque converter which is a fuel saving measure.At cruising speeds,the torque converter "locks up" creating a 1:1 ratio from engine rpm to transmission input.This is somewhat like overdrive in a sense. TCC (torque converter clutch ) depends on the vehicle speed sensor input to determine cruising speeds and conditions where TCC is permissable.Incorrect TCC operation can cause subsequent damage and/or serious driveability problems.

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This sound like you are feeling the transmissions torque converter going in and out of lock up. When the torque converter goes into lock up it feels like a shift . One way to tell if it is the converter you are feeling is to push the od button disabling overdrive and see if it still does it. The converter will still go into lock up .

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