dci 1.5 glowplug module open circuit query

Hi all. . Wondering if any of you can answer this. .I have lumpy idling on my 54 plate dci clio.. Very well serviced . Had the codes read. . Came up with the glowplug module circuit open fault. . Im having no starting issues at all. . Hot or cold. ..it drives fine with good mpg... Would this fault cause lumpy idling? I know electric faults can cause many issues but thought I'd ask you for any input. Occasionally I get the engine management light with stop. . As soon as I lift off pedal it goes out after a second or . Many thanks for any help