2005 Thunderbird goes into limp home mode with lighted wrench code on dash. Dealership cannot solve the problem.
Wrench light comes on. Car won't accelerate past 5 mph. Shut car off and it resets the light. Happens intermittently. Dealership cannot find the problem nor can they duplicate it.
There should be a code stored in memory of the computer unless it is loosing it's keep alive power, but they should have checked that at the dealer. You might want to double check that yourself by testing the fuses in both places, under the hood and in interior.
This happened to my '04 Bird. It turned out to be the coil packs. At the time, Ford had a recall on the packs and they replaced 7 of the 8 packs. The problem was solved. I also own a '04 Lincoln LS (with the same drive train as the T-Bird). It had the same symptoms but it turned out to be the throttle body controller.
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