Cap – GM (23404178)

The cap here is the GM part, numbered 23404178.

• Part number 23404178
• Brand GM
• Category Covers & Caps > Caps & Plugs
• Worth knowing Where a cover sits against a painted panel, a slight shade difference is normal on service parts supplied primed rather than finished.

A cap that vents and a cap that does not are visually similar, and swapping them gives a fault code or a pressure leak rather than a fit problem.

Confirm the number before you order, because a near match will bolt on and still be wrong. Send the VIN if the old marking has gone.