GM OBD Trouble Code 87

EEPROM error (flash memory error)

If the ECM detects an internal fault with the EEPROM code 87 will set. The EEPROM is a special "chip" that is installed in the ECM, based on the particular vehicle configuration.

Fault Code Description

  • 87 - EEPROM error (flash memory error)


  • Engine may not start
  • Poor engine performance

Common Problems

  • Internal fault with EEPROM
  • EEPROM incorrectly installed in ECM

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I have a 2000 ranger 3.0l flexfuel 4x4. where is the ecm located? and is it easily accessable? thank you for the help!
Is there anyone other than the dealer that can do this?