Engine-Codes.com
Engine-Codes – Generic – P0670

P0670 Code - Glow Plug Control Module Circuit Fault

Quick Answer

The P0670 diagnostic trouble code (DTC) indicates a fault in the glow plug control module circuit. Common causes include Wiring harness damage or corrosion, Faulty glow plug control module, Malfunctioning engine temperature sensor. 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 Wiring harness damage or corrosion, Faulty glow plug control module, Malfunctioning engine temperature sensor.
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.
What is this?
Table of contents Created and updated by William Orellana on Sep 13, 2024
💬 Need more help? Ask Auto Expert for instant answers — it's free!
AutoCodes App

Fix Your Car Smarter

Try the New AutoCodes App!

Get complete OBDII diagnostics, repair solutions, and cost estimates, plus AI chat support on demand.

AutoCodes App on Google Play

Code P0670 Description

The P0670 diagnostic trouble code (DTC) indicates a fault in the glow plug control module circuit. Glow plugs are essential components in diesel engines, as they heat up the combustion chamber to facilitate cold starts. The glow plug control module is responsible for regulating the operation of the glow plugs based on engine temperature and other factors. When this circuit malfunctions, it can lead to difficulties starting the engine, reduced fuel efficiency, and increased emissions.

OBDII Code P0670 - Glow Plug Control Module Circuit Fault
P0670 Code - Glow Plug Control Module Circuit Fault

Common Causes of P0670

  1. Wiring harness damage or corrosion.
  2. Faulty glow plug control module.
  3. Malfunctioning engine temperature sensor.
  4. Poor electrical connections.
  5. Water intrusion or contamination in the circuit.

Symptoms of P0670

  1. Difficulty starting the engine, especially in cold weather.
  2. Rough idling or misfiring.
  3. Reduced engine performance and power.
  4. Increased fuel consumption.
  5. Illumination of the check engine light on the dashboard.

How to Fix P0670

  1. Begin by conducting a thorough visual inspection of the glow plug control module circuit, checking for any visible damage or loose connections.
  2. Use a multimeter to test the continuity of the wiring harness and connections to identify any breaks or shorts.
  3. Test the glow plug control module and engine temperature sensor for proper functionality.
  4. Replace any damaged wiring, connectors, or components as needed.
  5. Clear the DTC from the vehicle's computer system and test the vehicle to ensure that the issue has been resolved.

Cost to Fix P0670

The cost of repairing a glow plug control module circuit fault can vary depending on the extent of the damage and the specific components that need to be replaced. On average, the parts for this repair can range from $100 to $300, while the labor costs may be between $150 and $300. However, it's important to note that these estimates are general guidelines, and actual costs can differ based on factors such as location, vehicle make and model, and the technician's rates. It's recommended to obtain a detailed quote from a reputable auto repair shop to determine the precise cost of addressing this issue.

When is the Code Detected?

The Engine Control Module (ECM) has detected a fault on the Glow Plug Control Module (GPCM) control circuit

Need more information about the P0670 code?

Need more information on how to fix the P0670 code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P0670 code diagnosed by a professional: Find a repair shop in your area

Code P0670 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

No Frequently Asked Questions about P0670 Code found.

Discuss the causes and fixes for P0670 OBDII Code

Submit a New Comment