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P0674 Ford Code - Cylinder 4 Glow Plug Circuit Fault

Quick Answer

The glow plug system is used to assist in providing the heat required to begin combustion during cold engine temperatures. Common causes include Faulty cylinder #4 glow plug, Cylinder #4 glow plug harness is open or shorted, Cylinder #4 glow plug circuit poor electrical connection. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

What it means
P0674 Ford indicates Cylinder 4 Glow Plug Circuit Fault.
Common causes
Common causes include Faulty cylinder #4 glow plug, Cylinder #4 glow plug harness is open or shorted, Cylinder #4 glow plug circuit poor electrical connection.
Severity
High - diagnose this code as soon as possible.
Can I drive?
Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
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Code Popularity 21,658
How popular is this code, among other codes? Low
What is this?
Table of contents Created and updated by William Orellana on Jul 18, 2022
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Code P0674 Ford Description

The glow plug system is used to assist in providing the heat required to begin combustion during cold engine temperatures. The glow plugs are heated before and during cranking, as well as initial engine operation. The Engine Control Module (ECM) controls the glow plug ON times by monitoring coolant temperature and glow plug voltage. The California Glow Plug system has eight individual glow plug supply circuits between the controller and the glow plugs. If the feedback voltage from the controller to the ECM is not within range, the ECM sets the OBDII code.
OBDII Code P0674 Ford - Cylinder 4 Glow Plug Circuit Fault - AutoCodes.com
P0674 Ford Code - Cylinder 4 Glow Plug Circuit Fault
What does this mean?

What are the Possible Causes of the DTC P0674 Ford?

  • Faulty cylinder #4 glow plug
  • Cylinder #4 glow plug harness is open or shorted
  • Cylinder #4 glow plug circuit poor electrical connection
  • Faulty glow plug module

How to Fix the DTC P0674 Ford?

Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.

What does this mean?

Code Tech Notes





User Submitted Video

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P0674 Ford code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.

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About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

Frequently Asked Questions about P0674 Ford Code

No Frequently Asked Questions about P0674 Ford Code found.

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  • I have a 2011 f 250 6.7 diesel with the codes p0299 turbo/surpercharger under boost, p0674 cyl 4 glow plug circuit, p0208b reductant pump control range. what could but the best place to start to find the primary cause of complete shut down,

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  • I don't see any relation between the codes, you should start by clearing all the codes and check the code that comes back first. Any other symptoms?

    P0299 FORD - Turbo/Supercharger Underboost
    Read more: https://www.autocodes.com/p...

    P208B FORD - Reductant Pump A Control Range/Performance
    Read more: https://www.autocodes.com/p...

    P0674 FORD - Cylinder 4 Glow Plug Circuit Fault
    Read more: https://www.autocodes.com/p...

    Reply to Comment

  • The truck just died while driving, going about 25-30 mph. The low oil pressure message popped up, then it died. Won't start up. Won't even crank.

    Reply to Comment
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