one time tranmission warning - Ford Forums - Mustang Forum, Ford Trucks, Ford Focus and Ford Cars

NCVinVT · 01-30-2011, 10:26

2002 XLT V8 with 162,000 miles and 58,000 miles on Ford rebuilt transmission. Had a Ford shop do a tranmission flush etc after 30,000 miles on the rebuilt. One afternoon last week I got flashing O/D warning on start up. I think it was shifting somewhat erratically when I drove straight to local mechanic for a scan: PO733 incorrect 3rd gear ratio. He did not erase the codes or the warning. Since then with 4 or 5 successive start ups and short trips I get no flashing O/D and transmission seems to shift OK. I'm hoping that it was just an electronic hiccup. I don't want to spend another $3,000+ on another tranmission job on this SVU. Ideas?

**360ci** · 02-19-2011, 20:50

I believe it's just a communication problem, or the wiring harness to the trans might have a wire with a broken or worn casing causing a short, and hence the odd warning light. For it to flash the same code however might mean it's sensor related.

In other cases (mostly with Dodge products) of engines of similar years, the IAC, or TPS can cause a transmission to shift erratically. Both sensors, the Idle air control and throttle position sensor are found on the throttle body. Both are about $50 or less, so shop around, stay away from dealer parts as they'll be $100 each, if not more - I made that mistake.

Another thing is to take it on a 100 mile or so drive, crank the tunes, or whatever, and go. Warm it up for a good half hour, pull over, check the level, and head home. As long as the light doesn't stay on, I wouldn't worry if it only flashes periodically, although I know it can be an annoyance. As vehicles age, some things (mostly emission related) cause the engine/trans light to be on all the time....