AutoCodes – Ford – P066D Ford

P066D Ford Code - Cylinder 2 Glow Plug Control Circuit High

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: P066D Ford indicates Cylinder 2 Glow Plug Control Circuit High.
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 1,678

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 P066D 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 P066D Ford - Cylinder 2 Glow Plug Control Circuit High - AutoCodes.com — P066D Ford Code - Cylinder 2 Glow Plug Control Circuit High

What does this mean?

What are the Possible Causes of the DTC P066D 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 P066D 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 P066D 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 P066D Ford code?

Need more information on how to fix the P066D 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 P066D Ford Code

1. What are the common symptoms of OBDII code P066D Ford?

The common symptoms of code P066D Ford include engine misfires, rough idling, decreased fuel efficiency, and the illumination of the check engine light.

2. What does the OBDII code P066D Ford indicate?

Code P066D Ford indicates a high voltage condition in the cylinder 2 glow plug control circuit, signaling a potential issue with the glow plug system.

3. What are the possible causes of OBDII code P066D Ford?

Possible causes of code P066D Ford include a faulty glow plug, damaged wiring or connectors in the glow plug circuit, a malfunctioning glow plug control module, or a problem with the engine control module.

4. How can I diagnose the OBDII code P066D Ford?

Diagnosing code P066D Ford typically involves inspecting the glow plug, checking the wiring and connectors for any damage, testing the glow plug control module, and using a diagnostic scanner to pinpoint the exact cause of the issue.

5. Can I still drive my vehicle with OBDII code P066D Ford?

It is not recommended to drive your vehicle with code P066D Ford, as it can lead to further damage to the engine and emissions system. It is advisable to address the issue promptly to prevent any potential complications.

6. How can I repair OBDII code P066D Ford?

Repairing code P066D Ford may involve replacing the faulty glow plug, repairing or replacing damaged wiring and connectors, testing and potentially replacing the glow plug control module, and clearing the code with a diagnostic scanner.

7. Are there any preventive measures to avoid OBDII code P066D Ford in the future?

To prevent code P066D Ford in the future, it is advisable to perform regular maintenance on the glow plug system, inspect the wiring and connectors for any signs of wear or damage, and address any issues promptly to avoid further complications.

8. Is it safe to reset the check engine light after repairing OBDII code P066D Ford?

Once you have repaired code P066D Ford, it is safe to reset the check engine light using a diagnostic scanner. However, if the issue persists, the light may come back on, indicating that further diagnosis and repairs are needed.

9. How much does it cost to repair OBDII code P066D Ford at a repair shop?

The cost of repairing code P066D Ford at a repair shop can vary depending on the exact cause of the issue, the cost of parts and labor, and the shop's hourly rate. It is recommended to obtain quotes from multiple shops for an accurate estimate.

10. Can a DIY enthusiast fix OBDII code P066D Ford at home?

While some DIY enthusiasts may have the skills and tools to diagnose and repair code P066D Ford at home, it is recommended to have the issue addressed by a professional if you are not experienced in working on automotive electrical systems to avoid causing further damage.