12-05-09, 09:55 PM
Just finished changing my head gaskets 3 weeks ago:banghead:. While the cradle was down I replace the TCC solenoid because I had the P0741 code. Well, after the change I still have the code. I have verified the TCC does not work (See numerous other posts). My old solenoid looked fine. Any further suggestions? I know it's not major but since I did go through the trouble to do the hard part (changing the solenoid), it would be nice to not have the SES light on all the time.
12-06-09, 12:55 PM
pull the light bulb? LOL
soiunds like the seals in th TC are gone
12-06-09, 06:41 PM
there's a problem internally. If you didn't have code p1860 before the solenoid was changed, it likely wasn't the solenoid at all.
Could be the torque converter - I think the TSB says to change that also to be sure to correct the problem
12-12-09, 07:27 PM
Well, I finally got the check engine alarm off after getting the engine tuned up.Cylinder 2 was not firing so I changed out the coil after checking the wires, plugs, cap and injectors. Can't trust even computers to give the right info. I bought this 1999 deville in 2006 from an ebay auction with 101k miles, ran good so I completed the purchase. On the way home the check engine light came on, but I never had it fixed. The tranny place wanted $1400 to try and fix it though he couldn't guarantee that price to finish the fix. Heck, I paid $4900 for it. The tranny was working fine as I've been driving it for 20k miles to date.
Ebay guarantees purchases if you buy a lemon, but the price has to be much more, like a new tranny.
In NW Indiana we have emmissions test every 2 years and they would not test it because of the error. Finally had to get the emmission boss out to give me a pass the 1st time, he did. 2 years later, I had to disconnect the battery overnight to get it emmission tested and passed before the computer could put out the p0741 alarm again. (found the computer took a while to get it after swapping the battery for a new one). Oh, the trial of caddy owners.
07-15-10, 12:37 AM
If you have P0741 and P1860:
Check to see if the circuit from the brake switch has an open between the brake pedal and the PCM.
Check the circuit from the PCM to the AT 20-way connector terminals U and V for a short to ground, voltage or an open.
Check the circuit from the AT 20-way connector to the TCC solenoid for a short to ground.
If you have P0741, but do not also have P1860:
There is another valve activated by the TCC solenoid that should be checked. Also verify that the torque convertor is ok.
In either case:
Read this tech tip thread for more tips