My Liberty is throwing an engine code for a bad glow plug. It shouldn't be a big deal to replace, but I don't know if it has the old 5v or the new 7v glow plugs. Is there a simple way to tell so I can be sure that I am ordering the correct part?

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2005 White CRD.

For the glow plugs, you can simply look at them and there should be a colored ring near the end where the plug slides over it:

White = Bosch 7v Ceramics
Red= Bosch 5V Steel, Jeep's replacement for the ceramic s
No Ring = Etencno Steel

The above info is a quote that I copied from a winterizing thread. This information was supplied by Masshole.

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2020 Ram 1500 CC Ecodiesel Limited
1995 Dodge Ram 2500 4x4, 5.9 Cummins, 47RH, Reg Cab
2005 Liberty CRD,fixed the rockers and a couple more things,GDE Hot tune,Weeks Stage 1 and 2 EGR delete,Hot Diesel solutions Tstat assembly(wonderful heat!), ARP studs, OME 1.5" lift.....thanks Seth! (Sold)
2006 Liberty CRD....The Moose Hit

Or you can just open it up and check the rim around the threads. It will have voltage written on the rim.

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'06 Liberty CRD Limited. Bought at 91K miles.
ARP studs, New rockers, Stant inline tstat, Weeks 1&2, Provent, IDParts Silicone hoses,
2-1/2" Full OME lift, Timing belt, Water pump, TransGo kit, Plastic fan, Fumoto
2nd gen fuel head with 2nd stage 2 micron filter, in-tank lift pump, G2 Rear Diff Cover