Glow Plug Control Circuit
The MAXXFORCE-P0670-DT (MaxxForce) diesel fault code means: Glow Plug Control Circuit. This is a moderate severity code.
Unverified. We could not confirm this code's definition against freely available manufacturer documentation, so treat the meaning, severity and fix guidance on this page as unconfirmed. Check it against the manufacturer's service information for your exact model and serial range before acting on it. This page is kept out of search engines for that reason, and we are working through this family manual by manual.
- Keep driving?
- Yes, but fix soon
- DIY difficulty
- intermediate
- Estimated cost
- $150-$600
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View pilot availability →What Are the Symptoms of MAXXFORCE-P0670-DT?
- Hard cold start
- CEL
What Causes MAXXFORCE-P0670-DT? (Most Likely First)
- Failed glow plug control module Likely
- Open or shorted glow plug Possible
Can I Still Drive with MAXXFORCE-P0670-DT?
Yes, but fix soon. MAXXFORCE-P0670-DT is rated moderate severity. It is not an immediate stop-driving fault, but it will not clear itself — book the repair rather than ignoring it.
Frequently Asked Questions
What is P0670 on a MaxxForce DT (7.6L)?
P0670 on a MaxxForce DT (7.6L) (2007-2015) indicates: Glow Plug Control Circuit. This is a known fault code on the MaxxForce engine family and typically points to the causes listed above.
Can I drive with P0670 on my MaxxForce?
Yes, you can generally drive with this code, but diagnose soon to prevent secondary damage.
How much does it cost to fix MaxxForce P0670?
Repair cost is typically $150-$600 depending on the underlying cause and shop rate. Many MaxxForce faults (especially EGR cooler, head bolt, and VGT repairs) are major expenses that drove fleet owners to repower with Cummins or retire these trucks early.
Mechanics Guide Step-by-step diagnosis
How Do You Diagnose MAXXFORCE-P0670-DT?
Check glow plug resistance (should be 0.5-1.5 ohms).
Replace GPCM if driver fault confirmed.
Which Vehicles Commonly Get MAXXFORCE-P0670-DT?
- International 4300 DuraStar MaxxForce DT
- International 4400 DuraStar MaxxForce DT
- International 7300/7400/7500 WorkStar MaxxForce DT
- IC Bus CE-Series MaxxForce DT
- IC Bus RE-Series MaxxForce DT
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