My 2004 SES recently showed this warning light/buzzer after driving about 20 highway miles - no other symptoms. I checked fluid level and found it very low; filled w/Mercon V into hatched area per instruction manual. No issues until a few days ago, when it showed the same warning on a 1.5 hr highway trip.
I bought this car used at 102K and it now has 192K. I haven't changed the trans fluid or filter, & don't know the car's previous history. The fluid on the dipstick doesn't look black or smell bad. Car shifts well and shows no trans issues besides the warning light.
After this latest incident I got zero codes listed when I checked with my Bluetooth OBD-II reader.
Could a clogged trans filter, by itself, trigger the warning light?
Do trans codes show only on a pro-level OBD-II reader, or can I trust my reader's output?
Should I have the pan dropped and replace fluid/filter ASAP, then continue to replace more fluid every few thousand miles?
Any other advice?
[cross-posted at TCCA site]