AutoCodes – Ford – P066E Ford

P066E Ford Code - Cylinder 3 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 #3 glow plug, Cylinder #3 glow plug harness is open or shorted, Cylinder #3 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: P066E Ford indicates Cylinder 3 Glow Plug Control Circuit Low.
Common causes: Common causes include Faulty cylinder #3 glow plug, Cylinder #3 glow plug harness is open or shorted, Cylinder #3 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 2,000

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 P066E 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 P066E Ford - Cylinder 3 Glow Plug Control Circuit Low - AutoCodes.com — P066E Ford Code - Cylinder 3 Glow Plug Control Circuit Low

What does this mean?

What are the Possible Causes of the DTC P066E Ford?

Faulty cylinder #3 glow plug
Cylinder #3 glow plug harness is open or shorted
Cylinder #3 glow plug circuit poor electrical connection
Faulty glow plug module

How to Fix the DTC P066E 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 P066E 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 P066E Ford code?

Need more information on how to fix the P066E 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 P066E Ford Code

1. What does the OBDII code P066E mean on a Ford vehicle?

P066E indicates a problem with the Cylinder 3 Glow Plug Control Circuit, specifically that the voltage is lower than expected.

2. What are the common symptoms of code P066E?

Symptoms may include difficulty starting the engine in cold weather, rough idling, reduced engine performance, and an illuminated check engine light.

3. What causes the P066E code to appear on a Ford vehicle?

Common causes include a faulty glow plug, damaged wiring or connectors, a malfunctioning glow plug control module, or issues with the engine control module (ECM).

4. Can I still drive my Ford with the P066E code active?

While the vehicle may still be drivable, ignoring the code can lead to poor cold-start performance and potential engine damage over time.

5. How do I diagnose the P066E code?

Start by inspecting the glow plug, wiring, and connectors for damage or corrosion, and use a multimeter to test the voltage in the circuit. A diagnostic scan tool can also help verify the issue.

6. How do I fix the P066E code on my Ford vehicle?

Common fixes include replacing the faulty glow plug, repairing or replacing damaged wiring or connectors, or replacing the glow plug control module if necessary.

7. How much does it cost to repair a P066E code?

The cost can vary, but replacing a single glow plug typically costs $50â€“$150, while more extensive repairs like module replacement can range from $200â€“$500, depending on labor rates.

8. Can a bad glow plug cause other engine issues?

Yes, a bad glow plug can lead to poor engine performance, increased emissions, and difficulty starting in cold temperatures.

9. Do I need special tools to fix the P066E code?

You may need a multimeter, an OBDII scan tool, and basic hand tools to diagnose and repair the issue.

10. What should I do if the P066E code keeps coming back after repairs?

If the code persists, double-check all repairs, inspect for hidden wiring issues, and consider having the ECM reprogrammed or further diagnosed by a professional.