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
Error code P0672 in your RAM truck indicates a problem with the glow plug circuit in cylinder 2. This error typically occurs in diesel engines when the glow plug system fails to heat properly, which can cause hard starting or rough idling, especially in cold weather.
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Tools You'll Need

How to Fix Error Code P0672

  1. Scan and Clear the Code

    Always record error codes before clearing them, as they provide valuable diagnostic information.
  2. Locate Cylinder 2 Glow Plug

    Ensure the engine is cool before working on glow plugs to prevent burns.
  3. Test Glow Plug Resistance

  4. Check Wiring and Connections

    Disconnect the battery negative terminal before working on electrical connections.
  5. Test Glow Plug Control Module

  6. Replace Faulty Components

    Do not over-tighten glow plugs as this can damage the cylinder head threads.
  7. Clear Codes and Test

Parts You May Need

Glow plug control module
Check Price on Amazon
Electrical connector
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Anti-seize compound
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Glow plug control module
Check Price on Amazon
Electrical connector
Check Price on Amazon
Anti-seize compound
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 control module
Check Price on Amazon
Electrical connector
Check Price on Amazon
Anti-seize compound
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 control module
Check Price on Amazon
Electrical connector
Check Price on Amazon
Anti-seize compound
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 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.