Code 53: System OVERVOLTAGE
WARNING: This page is about a different car, the 1990 Pontiac Firebird and 1990 Chevrolet Camaro. However, it is still accessible from the selected car via links, so may be relevant.
This code indicates a basic charging system problem. Code 53 will set if voltage on ECM battery voltage line increases to greater than 17.1 volts for 2 seconds or more. Check and repair charging system as necessary. During the time this fault is present, ECM outputs will cease. Additional codes may also set in memory.