Test Description

WARNING: This page is about a different variant/trim than selected.

NOTE: Test numbers refer to numbers on diagnostic chart.

Code 67 will set if PCM does not detect an A/C pressure change when A/C clutch has been cycled.
If relay power feed is intermittent, A/C clutch status terminal may not detect voltage when A/C is commanded on.
Check A/C electrical harness for problems. If A/C clutch status line becomes intermittently open or shorted while compressor is on, PCM will be wrongly detecting A/C clutch going on and off. When this occurs and clutch remains engaged, PCM will not detect pressure change and a Code 67 will be set.
If A/C compressor clutch status circuit is intermittently open or shorted while compressor is on, PCM will wrongly detect compressor cycling on and off, but PCM will detect no pressure change and a Code 67 will set.

Fig 1: Code 67 Schematic (Corvette) A/C Pressure Sensor

Fig 2: Code 67 Diagnostic Flow Chart (Corvette) A/C Pressure Sensor