April 5, 2026: LEMON Manuals is launched! Read the announcement.

ECM Code EO90: VCC Brake Switch Input Problem: Action:

WARNING: This page is about a different car, the 1990 Cadillac Seville and 1990 Cadillac Eldorado. However, it is still accessible from the selected car via links, so may be relevant.

ECM will set Code EO90 and turn on SERVICE ENGINE SOON light.

Fig 1: ECM Code EO90 Circuit Diagram

Fig 2: ECM Code EO90 Flow Chart