This code came up when I had autozone scan my crd. Now I'm asking the experts. What is it and what's the remedy

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2005 Crd Silver Limited- arps, rockers, 7v etechno's, egr deleted, v6 airbox, metal cac's. Yeti's stage 2 tune. Euro TC, Ram tcm, pml transmission pan, facet lift pump

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2005 Jeep Liberty Limited CRD, JBA coilovers-4.5 Arms, 5xMoab's with 265-75-16 Mickey Thompson Baja ATZ, Safari snorkel, Suncoast T/C, GDE Hot tune, Mandrel bent CAC Tubes, EHM to airbox, Mopar skid's, Fumoto Drain Valve, 3% Tint, ARB front bumper, Full set of Miller tools (9599) to loan within my immediate vicinity.

Thanks for the link.

It says glow plug #1 circuit low

What does that mean

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2005 Crd Silver Limited- arps, rockers, 7v etechno's, egr deleted, v6 airbox, metal cac's. Yeti's stage 2 tune. Euro TC, Ram tcm, pml transmission pan, facet lift pump

Bad Glow plug..... check circuit.

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2006 Liberty Limited CRD, Deep Beryl Green, Yeti tune, Arp studs, new cams, rockers, lifters, TB. "Green Monster"
2005 Liberty Sport CRD, Deep Beryl Green, GDE Hot Tune, ARP studs. "Rocket"
1982 Fiat 124 Spider Convertible. "Fiona"

trace any of the glow plug wires up to the 4 way connector
pull that and measure the contact to ground - good is ~ 1-2 ohms (some meters don't read that low very well)
bad is typically ~100-200 ohms.
(numbers aren't always right - the wires are)

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2005 CRD
stuff
Skeptic quod gratis asseritur, gratis negatur