AutoCodes – Generic – P06C4

P06C4 Code - Cylinder 12 Glow Plug Circuit Range/Performance

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 #12 glow plug, Cylinder #12 glow plug harness is open or shorted, Cylinder #12 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: P06C4 indicates Cylinder 12 Glow Plug Circuit Range/Performance.
Common causes: Common causes include Faulty cylinder #12 glow plug, Cylinder #12 glow plug harness is open or shorted, Cylinder #12 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 1,234

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
Comments
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Code P06C4 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 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 P06C4 - Cylinder 12 Glow Plug Circuit Range/Performance - AutoCodes.com — P06C4 Code - Cylinder 12 Glow Plug Circuit Range/Performance

What does this mean?

What are the Possible Causes of the DTC P06C4?

Faulty cylinder #12 glow plug
Cylinder #12 glow plug harness is open or shorted
Cylinder #12 glow plug circuit poor electrical connection
Faulty glow plug module

How to Fix the DTC P06C4?

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 P06C4 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.

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Information for Specific Makes

P06C4 Ford — Cylinder 12 Glow Plug Circuit Range/Performance

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.