Code P0446 in a 2003 Lesabre.

[Jim Sparr]

I am the OP regards the OBD II code no. P0446 on my 'new to me' 2003. I think I may have found the cause and the solution of this code. I am in the middle of flushing and replacing the old leaking radiator, the thermostat, and both upper and lower radiator hoses. I found a broken plastic vacuum line. If you will look at BGFM post no. 9 above on this topic, you will see a great photo of the entire device now known as GM part no. 24506671 which is a combination of a purge valve, MAP sensor, and a fuel pressure regulator. Please note the small plastic line that starts just to the right of center with a 'L ' shaped 'sock' connection and goes via a thin plastic line to the large round connection on the far right end. I found the 'thin plastic line' was cracked where it entered into the 'large round connection on the right end'. Solution: I went to my friendly auto parts store and bought a Dorman part no. 47430 which is an assortment of 4 different vacuum hose connectors in 4 diff. sizes. One size fitted the broken hose and was a perfect fit. Cost of these four connectors was $6.99 plus tax .
Since I am in the middle of replacing the radiator and associated parts, I am not able to drive it right now to see if the code P0446 goes away. I have already purchased the combo part above from Rock Auto. If this small connector solves this problem, I will replace it with the new combo harness of GM part no. 24506671--cost =$19.88. Once I have the new rad. installed and drive it, I will let you know if this simple vacuum leak fix does or doesn't solve this P 0446 problem. In the meantime, I recommend carrying the four piece vacuum hose connectors in the Glove box. Just in case.

 

[02LTD]

With an old car you should have at least a foot of vacuum tubing on hand. It’s pretty cheap and available at most auto parts stores. If you buy a pack of tee fittings and connectors by Dorman you can repair most vacuum leaks without having to hunt for vehicle specific lines which will be more costly. A good counter man at the parts store will point you to what you need.

 

[Jim Sparr]

I would like to start a separate thread on items to carry such as these vacuum hose connectors or a length of vacuum hose to have on hand in case of an emergency. I will start the thread with my favorite HFT /Harbor Freight Tool which is a 5/16 inch GM battery side terminal wrench. It is less than $20 and very slim and light weight. It can be carried in the Glove box, door pocket, console or trunk tool kit. When you replace your serpentine belt, save the old one in a plastic bag to have for emergencies. It may get you home after a long weekend trip.