Join Date: Aug 2005
Location: Arlington Texas
Been there, done that!
P1776 is the code for soleniod stuck in low/reverse. This is a fairly common problem and can be prevented most of the time by keeping the fluid clean. Sometimes they leak, but most of the time, they get clogged with debris.
I had this happen to mine because the previous owner didn't change the fluid at the specified inteval and to add insult to injury, the dealer didn't put the dipstick all the way down! Needles to say, mine clogged!
Get the transmission fluid flushed completely and have a new filter installed and install a new solenoid pack. It should work fine after the above maintenance and repair is completed. Change the fluid and filter every 30000 miles. Get it done at the dealership or a GOOD transmission shop. (DO NOT take it to AMMCO!)
Use ONLY ATF+4 fluid! Anyother fluids may cause reduced performance and in some cases, damage.
2004 300M Special...157K miles. Needs more mods!