Hello Phil,
As most have stated, it is most likely the PNP switch. However, I have also seen many ignition switch faults cause the reverse lights to become inoperative. The electrical part of the ignition switch is a common failure in these cars, leading to many possible symptoms:
-Intermittent reverse lights
-Intermittent ABS lamp on w/ no stored ABS codes
-Headlights don't work, neither do the dash lights
-Shifter stuck in park
Anyway, as others have said, it is likely to be the PNP switch, but I wouldn't rule this one out. A junk ignition switch will also set no DTC's. I hope this helps...
Joe S. - Volvo Master Technician
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