Note On Intermittents

This code sets due to a false start condition which engine speed exceeds 568 RPM but does not start.

Fig 1: Code P053 Schematic, 4X Reference Signal Interrupt From Ignition Control Module

Courtesy of GENERAL MOTORS CORP.

Fig 2: Code P053 Diagnostic Flow Chart, 4X Reference Signal Interrupt From Ignition Control Module

Courtesy of GENERAL MOTORS CORP.