Glow plug module, or glow plugs?

[spyro235]

My code is 004A2E "Glow plug cylinder 5, control"

All- I'm very familiar with the fact that glow plugs go on the diesels. I did have a failed thermostat, and had to drive on it for a bit. I would assume I'd have to replace the module. What I'm wondering, is maybe it's just the control module? Being that I could replace the control module without pulling the intake, what're the chances that a new module will fix the issue? I suspect I'm fully capable of taking the manifold off, but right now I have no leaks or issues, and I really prefer to avoid removing the manifold if I can.