Car will go into limp mode daily?

2007 FORD FIVE HUNDRED
120,000 MILES • AUTOMATIC
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JUGGALO45
Car will go into limp mode daily . Shut it down. Wait a few. Start back up and fine. P2544 code. Cleaned throttlebody and corroted battery cables. Now runs better, only does it maybe once every other day if that but still does it.
May 30, 2026 at 2:04 AM
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AL514
  • ASE Certified Mechanic
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  • ASE Certified Mechanic
Hello, If you are finding corroded battery connections and probably other ground connections as well, that might be the cause. Go through and clean all the ground wires connected to the engine block, frame/body, and finally the wiring right at the battery. The battery cables can corrode inside as well, so look for green or white crusties in any connectors or sections of the wiring harness. It would be nice if this is just a bad ground somewhere. I will look that code up further.

May 30, 2026 at 7:45 PM
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AL514
  • ASE Certified Mechanic
  • 5,541 POSTS
  • ASE Certified Mechanic
So I dont see this code in service info, but a quick search looks like the code is a "Torque management request input Signal A malfunction". This is flagging a communications problem between the TCM (transmission control module) and the PCM (engine computer). Which would make sense that it is going into limp mode, because the false safe for the transmission is limp mode a lot of times to prevent damage to it or the engine. So its something that will need to be looked into further, but from what you are desribing with the wiring, start checking connectors for corrosion inside, look at the pins inside the connectors for any green corrosion growing in there. The modules communicate on a data network, so any issues with communications on the Canbus network can cause this same type of fault. The transmission control module itself might have codes stored in it, but you will need a scan tool capable of communicating with more than just the engine computer.
May 30, 2026 at 7:56 PM
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