Code 12: System Normal

WARNING: This page is about a different car, the 1990 Isuzu Trooper, 1990 Isuzu Pickup, and 1990 Isuzu Amigo. However, it is still accessible from the selected car via links, so may be relevant.

Code 12 is always displayed when the key is in the "ON" position and the engine is not running and ONLY means that the engine is not running. Code 12 is not stored in memory.

NOTE: If Code 12 is only displayed when the function key is operated after clearing the memory, it indicates that the ECM electrical circuits and self-diagnosis system are functioning properly.