One door wont unlock and the cab light wont come on

[love-horsepower]

06 mega cab diesel passenger rear door wont unlock and the cab light wont come on with that door. Windshield wipers wont park, and torque converter locks up at idle. Is their a power train control module that controls all of that everything except wipers just started happening.

 

[jgillott]

Broken wire bundle in the door coming out of the B pillar for light and door lock. Suspect the TIPM for your other issues.

 

[cerberusiam]

Door lock and light is probably door wiring, wipers is probably the control on the motor, TC locking up is probably a failed TC. Is it killing the engine at idle or ???

 

[love-horsepower]

Does kill the engine just lugs it down.

 

[cerberusiam]

If it lugs the engine down at a stop and wants to pull thru the brakes the TC has failed.

 

[dieselshadow]

If it lugs the engine down at a stop and wants to pull thru the brakes the TC has failed.

Can you explain this further please? I don’t see how a failed TC can lockup or begin to “stiffen up” without being loaded up with junk, blown bearings, or something else massively failed. At that point almost nothing would be working in the trans. The TC can’t lockup without fluid from the solenoid within the valve body. It requires pressure within that circuit to activate the lockup clutch. An uncommanded lockup seems like its not the fault of the TC to me.

What am I missing?

 

[cerberusiam]

Actually, the TC can lockup and there be little wrong with the transmission. The TC is heavy and can take a lot of abuse and heat in a diesel application, that can cause the pump cover to warp and bleed pressure into the lockup circuit cause the clutch to drag. However, the typical failure does not involve the TC clutch, rather it is the sprag clutch on the impeller that gives the TC a "stall" that fails and locks like it normally does when wheel speeds go beyond 35 mph or so. The sprag clutch locking is essentially a no stall TC and it is trying to pull all the time, not only does it try to pull thru the brakes at a stop the truck is doggy off the line as the lack of stall won't let the engine rev correctly. Once it is up over 35 mph or so it shifts and works fine. The less common failure is when the sprag completely fails and the truck refuses to move at all, once that sprag fails to lock at all it is just free wheeling. Sometimes you see the result of the failure with excess clutch material or maybe metal fragments in the pan, other times there is almost no FOD to indicate what the issue really is. The OE TC's are notorious for failing the sprag clutches and randomly warping the pump cover causing problems. Ignore the issues long enough and it will require a full trans rebuild.

 

[dieselshadow]

Thanks for explaining that in greater detail. That makes more sense now. Even though I haven’t heard of that or have experienced this, doesn’t mean it doesn’t happen

 

[cerberusiam]

The failed TC's are very common, just misdiagnosed most of the time in favor of rebuilds by shops. The heat exchanger failures are much less common than a TC failure but always garner more attention because it is hard to misdiagnose coolant in the trans fluid. I have 8 of these trucks over a 20 year period, mostly autos in 1st, 2nd, and 3rd gen. Have had 2 TC failures in the sprag clutch, was definitely that when the TC was cut apart and checked. Rebuilt the TC and slapped it back in with no issues. I have never had a heat exchanger failure in millions of miles of normal to hard usage. I have seen one failure traced back to a warped pump cover and it was parts yard trans, I think it just sitting around with the heavy C hanging on the stator support with no support from a flex plate caused it.