What causes GM code 87?

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

How do I fix GM code 87?

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

87 EEPROM Error

Q: What does GM code 87 mean?

GM code 87 — EEPROM Error. Applies to 1992-1995 Corvette, Camaro, Caprice, C/K trucks.

Make: GM (1982-1995)
Category: Powertrain - Computer and Auxiliary Controls
Severity: Check Engine Light
Applies to: 1992-1995 Corvette, Camaro, Caprice, C/K trucks

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.

What does GM code 87 mean?

87 — EEPROM Error. This code sets when your vehicle computer detects eeprom error.

Common causes of 87

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

How to fix 87

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