P0672 - DTC P0672 - Glow Plug Circuit High Input (Common in 2003-2010 Ford 6.0L Diesel Engines)

Quick Answer

P0672 means: P0672 indicates a high input from the glow plug circuit for cylinder 2 in diesel engines.

Fix: Check and replace faulty components Cost: $100 - $300 Time: 90-180 minutes

Can I drive with P0672? Address this issue as soon as possible to prevent starting problems.

Common Questions

What does P0672 mean and how does it affect my car?

P0672 indicates that there is a problem with the glow plug circuit for cylinder 2, which can cause hard starting, rough idling, and decreased fuel efficiency. If left unaddressed, it can lead to more significant issues like engine misfires or damage to the diesel particulate filter.

What are the most common causes of P0672 and how much does it cost to fix?

The most common cause of P0672 is a faulty glow plug, which can cost between $100 to $300 to replace. Other causes include wiring issues, which can range from $50 to $150, while replacing the ECM could be as high as $1500.

Can I drive my car with P0672 or should I stop immediately?

It's best to avoid driving your vehicle if you have a P0672 code, especially in cold weather, as this could lead to hard starting and performance issues. Ignoring the code can exacerbate the problem and lead to more costly repairs.

How can I diagnose P0672 myself using GeekOBD APP?

Using the GeekOBD APP, you can scan for codes and retrieve freeze frame data. This will help you understand the conditions under which the P0672 code was triggered, allowing you to pinpoint the issue more effectively.

What vehicles are most commonly affected by P0672?

P0672 is frequently found in diesel engines, particularly in models like the 2003-2010 Ford 6.0L diesel engines. Owners of these vehicles should be vigilant for symptoms related to this code.

How can I prevent P0672 from happening again?

Regular maintenance, including checking and cleaning electrical connections, testing glow plugs, and using diagnostic tools like the GeekOBD APP, can help prevent the recurrence of this issue.

What is P0672?

The diagnostic trouble code P0672 indicates a problem with the glow plug circuit for cylinder 2 in diesel engines. Glow plugs are essential for starting a diesel engine, especially in cold weather, as they preheat the air in the combustion chamber. When the engine control module (ECM) detects that the glow plug circuit for cylinder 2 is drawing too much voltage (high input), it triggers the P0672 code. This can lead to hard starting, rough idling, and increased emissions. In real-world terms, if your vehicle has this code, it may struggle to start on cold mornings or exhibit a lack of power during acceleration. Ignoring this code could lead to more severe issues, like engine misfires or damage to the diesel particulate filter (DPF). Therefore, addressing a P0672 code promptly is crucial for maintaining your vehicle's performance and longevity.

System: P - Powertrain (Engine, Transmission, Emissions)

Symptoms

Common symptoms when P0672 is present:

The check engine light illuminates, remaining on until the issue is resolved, indicating a malfunction in the glow plug circuit.
Engine hesitates during acceleration, especially when cold, as a result of inadequate preheating of the air-fuel mixture.
Fuel economy decreases by 10-15%, as the engine struggles to operate efficiently without proper glow plug function.
Rough idling can occur, leading to a shaky driving experience and potential vibrations within the vehicle.
Hard starting in cold weather is common, as the glow plugs are not sufficiently warming the combustion chamber.

Possible Causes

Most common causes of P0672 (ordered by frequency):

{'cause': 'Faulty glow plug (60%) - The most common issue is a failed glow plug that cannot heat properly, preventing the engine from starting smoothly.', 'details': 'Over time, glow plugs can wear out, especially in diesel engines that see heavy use or extreme temperatures.'}
{'cause': 'Short circuit in wiring (20%) - Damaged or corroded wiring can cause electrical shorts, leading to high input readings.', 'details': 'Inspecting the wiring harness for signs of wear or damage is essential, as this can often be the root of the problem.'}
{'cause': "Malfunctioning ECM (10%) - In rare cases, the engine control module itself may be at fault, misreading the glow plug's condition.", 'preventionTips': 'Regular diagnostics with tools like GeekOBD APP can help catch ECM issues early.'}
{'cause': 'Blown fuse (5%) - A blown fuse can interrupt the power supply to the glow plug circuit, throwing the code.', 'details': 'Checking the fuse panel and replacing any blown fuses can resolve the issue quickly.'}
{'cause': 'Poor electrical connections (5%) - Rust or corrosion at connection points can disrupt the electrical flow.', 'details': 'Cleaning and securing all connections can prevent intermittent failures and P0672 codes.'}

P0672 Repair Costs

Cost Breakdown by Repair Type

Glow Plug Replacement

Replacing the faulty glow plug for cylinder 2.

Total: $100 - $300
Success rate: 90%

Wiring Repair

Repairing or replacing damaged wiring or connectors.

Total: $50 - $150
Success rate: 80%

ECM Replacement

In rare cases, replacing a malfunctioning ECM may be necessary.

Total: $500 - $1500
Success rate: 70%

Money-Saving Tips for P0672

Start with the most common and least expensive repairs first
Use GeekOBD APP to confirm diagnosis before replacing expensive parts
Consider preventive maintenance to avoid future occurrences
Compare prices for OEM vs aftermarket parts based on your needs
Address the issue promptly to prevent more expensive secondary damage

Diagnostic Steps

Professional P0672 Diagnosis Process

Follow these systematic steps to accurately diagnose P0672. Each step builds on the previous one to ensure accurate diagnosis.

Step 1: Step 1: Initial visual inspection - Check for obvious signs like damaged wiring, loose connections, or corrosion (5-10 minutes)

Step 1: Initial visual inspection - Check for obvious signs like damaged wiring, loose connections, or corrosion (5-10 minutes).