RAM Truck Error Code P0672: How to Fix It
Medium 1-2 hours Medium Severity
Verified June 2026
- Error Code
- P0672
- Brand
- RAM
- Product Type
- automotive
- Severity
- Medium
- DIY Difficulty
- Medium
- Estimated Fix Time
- 1-2 hours
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Tools You'll Need
- OBD2 scanner
- Multimeter
- Socket wrench set
- Electrical contact cleaner
- Anti-seize compound
- Torque wrench
How to Fix Error Code P0672
-
Scan and Clear the Code
Always record error codes before clearing them, as they provide valuable diagnostic information. -
Locate Cylinder 2 Glow Plug
Ensure the engine is cool before working on glow plugs to prevent burns. -
Test Glow Plug Resistance
-
Check Wiring and Connections
Disconnect the battery negative terminal before working on electrical connections. -
Test Glow Plug Control Module
-
Replace Faulty Components
Do not over-tighten glow plugs as this can damage the cylinder head threads. -
Clear Codes and Test
Parts You May Need
Glow plug
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Glow plug control module
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Electrical connector
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Anti-seize compound
Check Price on Amazon
Glow plug
Check Price on Amazon
Glow plug control module
Check Price on Amazon
Electrical connector
Check Price on Amazon
Anti-seize compound
Check Price on Amazon
Glow plug
Check Price on Amazon
Glow plug control module
Check Price on Amazon
Electrical connector
Check Price on Amazon
Anti-seize compound
Check Price on Amazon
Glow plug
Check Price on Amazon
Glow plug control module
Check Price on Amazon
Electrical connector
Check Price on Amazon
Anti-seize compound
Check Price on Amazon
Glow plug
Check Price on Amazon
Glow plug control module
Check Price on Amazon
Electrical connector
Check Price on Amazon
Anti-seize compound
Check Price on Amazon
Glow plug
Check Price on Amazon
Glow plug control module
Check Price on Amazon
Electrical connector
Check Price on Amazon
Anti-seize compound
Check Price on Amazon
Glow plug
Check Price on Amazon
Glow plug control module
Check Price on Amazon
Electrical connector
Check Price on Amazon
Anti-seize compound
Check Price on Amazon
Glow plug
Check Price on Amazon
Glow plug control module
Check Price on Amazon
Electrical connector
Check Price on Amazon
Anti-seize compound
Check Price on Amazon
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When to Call a Professional
Call a professional if you're uncomfortable working with electrical systems, if the glow plug control module needs programming after replacement, or if multiple glow plugs are failing which could indicate a deeper engine problem requiring diagnostic expertise.Frequently Asked Questions
Can I drive my RAM truck with error code P0672?
You can drive short distances, but the truck may be difficult to start, especially in cold weather. The engine may run rough and produce white smoke until it warms up. It's best to fix this issue promptly to avoid potential engine damage.
How much does it cost to fix RAM error code P0672?
A glow plug replacement typically costs $50-150 for the part plus labor. If the glow plug control module needs replacement, costs can range from $200-500. DIY repairs can save significantly on labor costs.
What causes glow plugs to fail in RAM trucks?
Glow plugs commonly fail due to normal wear after 60,000-100,000 miles, excessive heat cycles, carbon buildup, or electrical issues. Poor fuel quality and contaminated fuel can also accelerate glow plug failure.
How long do RAM truck glow plugs last?
Glow plugs typically last 60,000-100,000 miles under normal driving conditions. Severe cold weather operation or frequent short trips may reduce their lifespan.
Will a bad glow plug damage my RAM engine?
A single bad glow plug won't immediately damage the engine, but it can cause incomplete combustion, increased emissions, and potential carbon buildup over time. Multiple failed glow plugs can cause more serious issues and should be addressed promptly.