2006 Mazda MPV ESFACTORY OEM SERVICE PROCEDURE

DTC P1623: Notes

DTC P1623 [AJ] DETECTION CONDITION AND POSSIBLE CAUSES

DTC P1623 Code word or key ID number read/write error in PCM
DETECTION CONDITION 
  • PCM internal EEPROM damaged.
POSSIBLE CAUSE 
  • PCM internal EEPROM damaged.
Factory Service Tools

Use the Manual With the Right Hardware

Pair factory procedures with proven DIY tools so the instructions are easier to execute.

Disclosure: Verified tool recommendations may earn an affiliate commission at no cost to you.

When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.