GMC Troubleshooting Questions? Ask a Mechanic for Answers
Hi my name is ***** ***** I will be happy to assist with this today.In some cases I may need more info to assist better.I apologize for any delay.
Have you cleared out these codes to see if all of these codes come back again or which codes come back again?
Let me know so we can continue,thanks Pete
And to be sure all of these codes are now coming back again?
O.k.,let me know when your ready.
O.k.,looking into these codes now,Will post back here shortly.
P0670 is glow plug control module circuit fault.This can be one or more of the glow plugs at fault or the glow plug controller as well as wiring issues to the glow plug controller itself.Below is the diagnostic info for this code.
C0055 indicates rear wheel speed sensor both wheels at fault.This leads to a faulty EBCM or PCM in most cases.Below is the diagnostics that need followed for this code here as well.
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