Post-reset
P1000 After Battery Disconnect or Replacement
Power loss can clear keep-alive memory and return OBD monitors to not ready. P1000 in that setting is expected status, not automatic proof the battery is defective.
The new battery is not automatically bad
A weak battery or poor connection can cause other symptoms and codes. P1000 after a successful replacement, however, commonly reflects lost readiness memory. Confirm the vehicle charges and cranks normally, then read monitors.
Inspection readiness may be affected
If you have an emissions appointment soon after a battery job, incomplete monitors can matter even when the truck drives well. See P1000 and smog check — rules are local.
Do not repeatedly disconnect the battery to “fix” it
That restarts readiness
Also check other codes
It often drops after required monitors complete. There is no guaranteed mile count. Recheck with a scan tool.
This site provides general diagnostic information. Vehicle procedures vary by model, year, engine, and calibration. Follow Ford service information and local regulations, and use a qualified technician when diagnosis or repair exceeds your experience.