OBD-I Codes List

GM 87 EEPROM Error

Make
GM (1982-1995)
Category
Powertrain - Computer and Auxiliary Controls
Severity
Check Engine Light

How to read it

Code 87 reads as 8 flashes, pause, 7 flashes on the check-engine light. Jump terminals A and B on the ALDL connector with the key off, then turn the key on with the engine off and count the check-engine flashes.

New to flash codes? The How to Read GM OBD-I Codes with a Paperclip walks through the test and what the numbers mean. The general OBD-I guide covers the rest.

What does GM code 87 mean?

EEPROM Error

Common causes of 87

  • Internal ECM memory failure
  • Low voltage during write
  • Corroded ECM connectors
  • Failed ECM

How to fix 87

  1. Read codes with a paperclip jumper or scan tool
  2. Check battery and charging voltage
  3. Clean ECM power and ground connections
  4. Clear the code and see if it returns on restart
  5. Try a known good MEMCAL where fitted
  6. Replace the ECM if code 87 keeps returning

Source

Qualified source review

Sources and review

Review: qualified. Read the source limits below.

  • GM and Chevrolet OBD1 Trouble Codes (ALDL Fault Code List)

    live reference page (troublecodes.net)

    Supports: code identity and GM meaning

    Fetched directly. Single publisher, so the record is qualified, not verified. Causes and check order are curator-written from the circuit the code names.

    https://www.troublecodes.net/gm/

Last updated 2026-09-19.

Report a correction for 87. Include your vehicle, the issue and a source if you have one.

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