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2000 Cadillac DeVille error code


Tomsrig

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Recently I got a check engine light. The code that was set said "the torque converter clutch was stuck off"

Is this bad? I mean, I only have 110,000 miles on the car. Certainly new American cars don't have this kind of problem, do they?

What should I do?

Tomtom

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How is the car driven? Is it mostly highway miles or city? How is your tranny fluid? Is it reddish purple or is it brownish and smell a little burnt?

What's the actual code that is being thrown, I mean the P*** code. I think I used to get that too. Was it something like P039? If so I have an idea.

-Dusty-

- 02 Seville STS, white diamond

- 93 Sixty Special, Tan with vinyl top

- 79 Coupe DeVille, Tan with Tan top

- 06 GMC Sierra Z71, Black

- 92 Silverado C1500, black and grey

- 83 Chevy K10 Silverado, Black and Grey

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What was the number of the code? DTC P0741 TCC System Stuck Off?

DTC P0741 TCC System Stuck Off

Circuit Description

The Powertrain Control Module (PCM) controls the Torque Converter Clutch Solenoid Valve (TCC Sol. Valve) pulse width modulation (PWM). The solenoid controls the hydraulic fluid for TCC apply and release. When the TCC is applied, the engine is coupled directly to the transmission through the TCC. The TCC slip speed should be near 0.

If the PCM detects high torque converter slip when the TCC is commanded ON, then DTC P0741 sets. DTC P0741 is a Type B DTC.

Conditions for Setting the DTC

• No MAF DTCs P0101, P0102, or P0103.

• No TP DTCs P0121, P0122, or P0123.

• No VSS DTCs P0502, or P0503.

• No A/T ISS DTCs P0716, or P0717.

• No TCC Stuck ON DTC P0742.

• No TFP Val. Position Sw. DTC P1810.

• No TCC PWM Sol. Valve DTC P1860.

• The engine has been running for more than 5 seconds.

• The engine is not in fuel cut off.

• The TFP Val. Position Sw. indicates D4.

• The transmission gear ratio indicates 2nd, 3rd, or 4th gear.

• The throttle angle is greater than 8 degrees.

• The transmission fluid temperature is -18-130°C (0-266°F).

• Delivered torque is between 43-202 N•m (32-150 lb ft).

• The TCC Sol. Valve is commanded ON at maximum duty cycle.

• The TCC slip must not exceed torque limits.

Action Taken When the DTC Sets

• The PCM illuminates the Malfunction Indicator Lamp (MIL).

• SERVICE ENGINE SOON, SERVICE TRANSMISSION displays on the Driver Information Center (DIC).

• The PCM inhibits TCC engagement.

• The PCM inhibits 4th gear if the transmission is in hot mode.

• DTC P0741 is stored in the PCM history.

1. Inspect for the following conditions:

o The TCC control valve is stuck OFF due to sediment or binding.

o The TCC regulator valve is stuck OFF due to sediment or binding.

o The TCC feed valve is stuck OFF due to sediment or binding.

o The oil pressure screen is clogged.

o The TCC Sol. Valve O-ring is leaking or cut.

o The turbine shaft seals are worn or cut.

o The torque converter for ballooning.

Check your fluid, for unusual color or foaming also check for correct level when tranny is at operating temp

Pre-1995 - DTC codes OBD1  >>

1996 and newer - DTC codes OBD2 >> https://www.obd-codes.com/trouble_codes/gm/obd_codes.htm

How to check for codes Caddyinfo How To Technical Archive >> http://www.caddyinfo.com/wordpress/cadillac-how-to-faq/

Cadillac History & Specifications Year by Year  http://www.motorera.com/cadillac/index.htm

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Bottom line is that there is no direct engine to trans lock up any more, so your mileage will suffer by about 1 mpg. I'd live with it as the cost to repair is around $2000.

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IGNORE it ???....... vehicle will not pass inspection, and How did you come up with 2k to correct when you do not know what is wrong??

read bodybyfisher's trouble shooting tree

A tech II scanner and -.5hr will cover

checking for PCM/TCM commanding TCC lockup and then checking for power to solenoid

.then Inspect for the following conditions:

o The TCC control valve is stuck OFF due to sediment or binding.

o The TCC regulator valve is stuck OFF due to sediment or binding.

o The TCC feed valve is stuck OFF due to sediment or binding.

o The oil pressure screen is clogged.

o The TCC Sol. Valve O-ring is leaking or cut.

finally these two get expensive but are way down list

o The turbine shaft seals are worn or cut. .... drivability & other codes would likely show

o The torque converter for ballooning. drivability again would likely have a higher stall

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As bodybyfisher stated ..... post the code, ALSO any other codes, recient repairs, modifications, add on's or aftermarket parts....

JUSt for a quick check, criuse control & brake lights working?

Good suggestion the diagnostic said this also:

1. Inspect the brake switch circuit.

2. Repair the circuit if necessary.

Pre-1995 - DTC codes OBD1  >>

1996 and newer - DTC codes OBD2 >> https://www.obd-codes.com/trouble_codes/gm/obd_codes.htm

How to check for codes Caddyinfo How To Technical Archive >> http://www.caddyinfo.com/wordpress/cadillac-how-to-faq/

Cadillac History & Specifications Year by Year  http://www.motorera.com/cadillac/index.htm

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I could be wrong, but I don't think that the brake switch will give that message.

It won't I don't think, but "checking the brake circuit" is in the P0741 diagnostic tree, and if you think about it, when we press the brake, it cancels the TCC (and the RPM jumps, its the TCC test we do to see if the TCC is engaged), so if the brake switch is adjusted wrong or bad, the brake could appear to be depressed...cancelling the TCC... or stopping it from engaging...making the system THINK its stuck off...

Is their a code for the BRAKE light stuck ON? :lol:

Pre-1995 - DTC codes OBD1  >>

1996 and newer - DTC codes OBD2 >> https://www.obd-codes.com/trouble_codes/gm/obd_codes.htm

How to check for codes Caddyinfo How To Technical Archive >> http://www.caddyinfo.com/wordpress/cadillac-how-to-faq/

Cadillac History & Specifications Year by Year  http://www.motorera.com/cadillac/index.htm

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This is why its $2k. Trans has to drop.

Just a pic showing my car about to have the cradle dropped to repair a burnt TCC solenoid. With me doing the repair..

BTW. The 14mm drop rods are available...Free..

This one was a hard code 1860 causing a false code 741. $30 solenoid part..

There is also a TSB about code 741..

post-2-1172731404.jpg

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....Is their a code for the BRAKE light stuck ON? :lol:

C1294.

Thanks Jim, thats interesting. So if there was a brake circuit problem that stopped the TCC from engaging you should get two codes...?

brake switches are multi contact.....brake lights may work BUT TCC and or Cruise may not

So do you think that the TCC portion of the switch can be shorted "ON" but the brake portion can operate OK? Now I wonder if the TCC portion of the brake switch being shorted ON stopping TCC engagement causes the P0741... I guess so if its in the P0741 diagnostic tree..

Pre-1995 - DTC codes OBD1  >>

1996 and newer - DTC codes OBD2 >> https://www.obd-codes.com/trouble_codes/gm/obd_codes.htm

How to check for codes Caddyinfo How To Technical Archive >> http://www.caddyinfo.com/wordpress/cadillac-how-to-faq/

Cadillac History & Specifications Year by Year  http://www.motorera.com/cadillac/index.htm

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Thanks, all for answering my questions.

The P code is P0741. TCC stuck off.

I've done more google searches on this and many say before I go spending money to fix this I should have the transmission oil and filters changed, then drive it for a while to see if the code comes back on.

I got the $2500 cost from the Cadillac dealer who saw the code. I got a counter bid from a transmission shop of $2200.

When the light first came on back in August last year, I had the codes reset. It did not register another P0741 code until late November. I reset it again and it came back on again in Late Feb this year.

I do mostly town driving, but once a month I take the car on a long 400mile drive in the country.

I change engine oil every 3000 miles. Since th car has 110,000 miles on it now, I am due for a transmission service, so I'll get that done and see what happens.

Finally, a Cadillac mechanic said it will not do any harm driving the car. He has great credentials, and is rather famous, but I won't drop his name.

I'll just keep an eye on this thing. I want to sell the car perhaps by the end of the year.

Thanks again for you guy's thoughtful inputs. What a great site this is.

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Logan,

I'm curious about those 14mm drop rods. I don't need any engine or transmission work at this time, but I'd never seen anything about drop rods before. Is that the hot ticket for dropping the cradle when it's necessary?

photo-36.jpg

Happiness is owning a Cadillac with no codes.

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Logan,

I'm curious about those 14mm drop rods. I don't need any engine or transmission work at this time, but I'd never seen anything about drop rods before. Is that the hot ticket for dropping the cradle when it's necessary?

It was just a idea I had that worked perfectly well. Actually very fast procedure once you get the AC lines...steering column...coolant lines disconnected.

The idea was to mantain control of the powertrain in a safe manner. While dropping it at the same time. Very cheap to do.

I think we are shipping the rods off to bodybyfisher in the next couple of days.

I added a pic. It does not show the rods...but it does show the 10-12 inches the system has to drop to gain access. Note: Front knuckle and extended strut relationship...10-12 inches difference...

post-2-1172904013.jpg

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I am due for a transmission service, so I'll get that done and see what happens.

What ever you do make SURE you get the transmission fluid "drained and refilled" as opposed to a Transmission "flush". Tranny flushes often reasult in Tranny failures shortly thereafter...I can't tell you how many times we have seen the following scenario play out:

Newbie513: "Help, I got my Trans Fluid changed a couple weeks ago and now my tranny won't shift right"

Ranger: "Did you get it changed or get it flushed?"

Newbie513: "Um I got it flushed, Dealership said that was the way to go..."

A.J.

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