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Battery drained; I charged the battery now the car does not run correctly?

Tiny
DEAN37751
  • MEMBER
  • 2005 FORD FIVE HUNDRED
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 216,000 MILES
Yes, I have the car listed above and I left the key in the ignition and the battery drained. Then I charged it and tried starting it, the motor will run but not correctly. The instrument cluster, gas pedal, and the A/C do not work. When I try cranking it, the headlights and taillights stay on for about 15 minutes without me turning them on. What could that be?
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Sunday, October 30th, 2022 AT 10:38 AM

1 Reply

Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 47,513 POSTS
This happens when the electronics get reset sometimes, I would disconnect the battery overnight to allow to memory capacitors to discharge, then reconnect the battery and the systems should go back to normal. You can try a hard reboot which is done by removing the negative side of the battery, with the cable loose from the negative side of the battery, hold it to the positive terminal for 1 minute this will discharge the memory capacitors in the BCM and PCM allowing the system to reboot. Please let us know what happens.
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Monday, October 31st, 2022 AT 10:01 AM

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