Diagnostic Aids

Control module will not go into closed loop if Code 13 is set. Code 13 may set if vehicle runs out of fuel or stalls while vehicle is in motion. If O2 sensor ground becomes loose, a false O2 sensor reading will occur. This can result in a Code 13 being set.

Fig 1: Code 13, Schematic, Open Oxygen (O2) Sens Ckt

Courtesy of GENERAL MOTORS CORP.

Fig 2: Code 13, Flow Chart, Open Oxygen (O2) Sensor Ckt

Courtesy of GENERAL MOTORS CORP.

Fig 3: Code 13 Flow Chart