AutoCodes – Ford – P066C Ford

P066C Ford Code - Cylinder 2 Glow Plug Control Circuit Low

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 #2 glow plug, Cylinder #2 glow plug harness is open or shorted, Cylinder #2 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: P066C Ford indicates Cylinder 2 Glow Plug Control Circuit Low.
Common causes: Common causes include Faulty cylinder #2 glow plug, Cylinder #2 glow plug harness is open or shorted, Cylinder #2 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 2,281

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on May 08, 2019

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P066C 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 P066C Ford - Cylinder 2 Glow Plug Control Circuit Low - AutoCodes.com — P066C Ford Code - Cylinder 2 Glow Plug Control Circuit Low

What does this mean?

What are the Possible Causes of the DTC P066C Ford?

Faulty cylinder #2 glow plug
Cylinder #2 glow plug harness is open or shorted
Cylinder #2 glow plug circuit poor electrical connection
Faulty glow plug module

How to Fix the DTC P066C 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 is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P066C 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.

Need more information about the P066C Ford code?

Need more information on how to fix the P066C Ford code? Get Access to Factory Service Manuals

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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 P066C Ford Code

1. What are the common symptoms of OBDII code P066C in a Ford vehicle?

- Common symptoms include rough idling, decreased engine performance, and the illumination of the Check Engine Light.

2. What causes the OBDII code P066C related to the Cylinder 2 Glow Plug Control Circuit Low in a Ford vehicle?

- The code may be caused by a faulty glow plug, damaged wiring, or a malfunctioning glow plug control module.

3. How can I diagnose the Cylinder 2 Glow Plug Control Circuit Low issue in my Ford vehicle?

- Diagnose the issue by inspecting the glow plug, checking the wiring for any damage, and testing the glow plug control module for proper functioning.

4. Can I still drive my Ford vehicle with OBDII code P066C present?

- It is not recommended to drive the vehicle with this code present as it can lead to further engine damage and decreased performance.

5. How do I repair the Cylinder 2 Glow Plug Control Circuit Low issue in my Ford vehicle?

- Repair options include replacing the faulty glow plug, repairing any damaged wiring, or replacing the glow plug control module if necessary.

6. Are there any DIY tips for fixing the OBDII code P066C in a Ford vehicle?

- While some basic inspections and tests can be done by DIY enthusiasts, it is recommended to have a professional mechanic diagnose and repair the issue to ensure proper resolution.

7. What are the potential risks of ignoring the OBDII code P066C in my Ford vehicle?

- Ignoring this code can lead to reduced fuel efficiency, engine misfires, and potential damage to other engine components over time.

8. How long does it typically take to repair the Cylinder 2 Glow Plug Control Circuit Low issue in a Ford vehicle?

- The repair time can vary depending on the exact cause of the issue, but it usually takes a few hours to diagnose and fix the problem.

9. Can a faulty glow plug cause other issues besides triggering the OBDII code P066C in a Ford vehicle?

- Yes, a faulty glow plug can lead to hard starting, increased emissions, and poor engine performance if not addressed promptly.

10. Is it possible to prevent the Cylinder 2 Glow Plug Control Circuit Low issue from occurring in my Ford vehicle?

- Regular maintenance, such as checking the glow plugs during service intervals, can help prevent issues like the Cylinder 2 Glow Plug Control Circuit Low error from occurring.