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Discussion Starter #1
Took truck to dealer and they said problem undetermined, OK to drive till next week when they can look at it.
Odd to me that they don't know what the code is but says OK to drive.

This same thing happened a few months back while out of town and light went off before I returned and didn't come on till yesterday.

Any ideas?

2018 L5P GMC 3500
 

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Glowplug on cylinder 5 is bad. I’ve heard it can be remedied by doing a glowplug relearn, but usually that code means it’s bad.


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Discussion Starter #3
Glowplug on cylinder 5 is bad. I’ve heard it can be remedied by doing a glowplug relearn, but usually that code means it’s bad.


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Thanks for response....

Glow plug not needed in our temps right now so OK to drive....????

20,000 mile truck and third time light has come on.
 

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You’re fine, even with a glow plug or two out, even in colder temps.

They can be temperamental, throwing codes for the littlest stuff.


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