Close

GM OBD Trouble Code 85

OBD I Code 85 - PROM error

If the ECM detects an internal fault with the PROM code 85 will set. The PROM is a special "chip" that is installed in the ECM, based on the particular vehicle configuration.

Fault Code Description

  • 85 - PROM

Symptoms

  • Engine may not start
  • Poor engine performance

Common Problems

  • Internal fault with PROM
  • PROM incorrectly installed in ECM

No comments yet...

Sign in to comment

Related Questions

See what others have asked about this, or visit the Questions page to ask your own question.
After a replacement of our serpentine belt, our heat blows cold. the temp display blinks. i heard i need to reset t...
My battery terminals were hooked up backwards. the 120 fuseablelink was blown. i replaced that and the car finally st...