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AutoCodes – Generic – P0670

P0670 Code - Glow Plug Control Module 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 Glow Plug Control Module (GPCM), GPCM harness is open or shorted, GPCM 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
P0670 indicates Glow Plug Control Module Circuit Fault.
Common causes
Common causes include Faulty Glow Plug Control Module (GPCM), GPCM harness is open or shorted, GPCM 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 42,564
How popular is this code, among other codes? Medium
What is this?
Table of contents Created and updated by William Orellana on May 05, 2019
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Code P0670 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 P0670 - Glow Plug Control Module Circuit Fault - AutoCodes.com
P0670 Code - Glow Plug Control Module Circuit Fault
What does this mean?

What are the Possible Causes of the DTC P0670?

  • Faulty Glow Plug Control Module (GPCM)
  • GPCM harness is open or shorted
  • GPCM circuit poor electrical connection
  • Faulty Engine Control Module (ECM)

How to Fix the DTC P0670?

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 is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P0670 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.

Need more information about the P0670 code?

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Need Help with the Code?

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Information for Specific Makes

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 P0670 Code

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