Note On Intermittents

WARNING: This page is about a different car, the 1995 Cadillac Eldorado. However, it is still accessible from the selected car via links, so may be relevant.

Manipulate circuits No. 1230 and 1231. Look for EMI sources, such as sensor wires running along spark plug cables or high power transmitters in vicinity.

Fig 1: Code P056 Schematic, Transaxle Input Speed Sensor Circuit Problem

Courtesy of GENERAL MOTORS CORP.

Fig 2: Code P056 Diagnostic Flow Chart, Transaxle Input Speed Sensor Circuit Problem

Courtesy of GENERAL MOTORS CORP.