P0672 code — how to fix error fast
When the P0672 code emerges, it's time to focus on the glow plug circuit. Grasp its relevance for a warm start.
If the code P0672 turned up on your diagnostic scanner, you may be pretty frightened as it clearly stands for a powertrain-related code due to the “P” mark. However, it takes knowing more about the code to figure out just how severe it can be for your engine, and the same goes for figuring out a solution.
This code is mostly relevant to diesel-powered cars, and since these operate a bit differently from petrol engines, you’ll need some more insight on the P0672 code meaning. That doesn’t mean you have to find professional help for this alone, since we’ll guide you through the code and potential reasons behind it to give you a complete breakdown of the issue.
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What does the P0672 code mean?
The P0672 code is a diagnostic trouble code related to the glow plug control circuit. Glow plugs are used in diesel engines to heat the engine cylinders before starting. When the engine is cold, the glow plugs to heat up the combustion chamber to ensure smooth engine startup. The P0672 code indicates that there is an issue with the glow plug control circuit, which could cause problems with engine starting and performance.
This code is one of the most common reasons behind diesel cars not firing up the engine, so make sure to read through the main causes of it to prevent this from happening to you.
What causes the P0672 code?
There are several potential causes of the P0672 code and they all bring along different symptoms. You may notice how it takes longer for your car’s engine to crank if the code is activated, so here’s what might have caused it:
Faulty glow plugs
One of the most common causes of the P0672 code is faulty glow plugs. Glow plugs can wear out over time, and if they are not functioning properly, it can cause problems with the engine starting and performance.
Glow plug control module failure
Another potential cause of the P0672 code is the failure of the glow plug control module. This module is responsible for controlling the glow plugs and ensuring that they are functioning properly. If the module fails, it can cause problems with the glow plugs and lead to the P0672 code.
Wiring issues
Wiring issues can also cause the P0672 code. If there is a problem with the wiring that connects the glow plugs to the control module, it can cause problems with the glow plugs and lead to the code.
Other potential causes
Other potential causes of the P0672 code include a faulty relay, a bad fuse, or a problem with the engine control module.
Which car models does the P0672 code affect the most?
The P0672 code is most commonly found in diesel vehicles. Some of the car models that are most likely to experience this code include vehicles powered by diesel engines since glow plug issues can’t affect petrol-based cars. We’ve done some more digging on this problem and came up with this list of commonly affected cars:
- Chevy Silverado 2500 HD: This heavy-duty pickup truck is equipped with a Duramax diesel engine that uses glow plugs to start the engine in cold weather conditions. A faulty glow plug control module can trigger DTC P0672 and cause starting problems.
- Ford F-250 Super Duty: Another popular heavy-duty pickup truck, the F-250 Super Duty is also prone to glow plug control circuit issues. Its Power Stroke diesel engine uses glow plugs for cold starts, and a failed control module can cause DTC P0672 and other related codes.
- Dodge RAM 2500: The Ram 2500 is a powerful pickup truck that features a Cummins turbo-diesel engine. Glow plugs are used to start the engine, and a malfunctioning controller can cause DTC P0672 and other issues.
How to diagnose the P0672 code
Diagnosing the P0672 code requires a diagnostic scan tool and a multimeter. Here are the steps to diagnose the code:
Check the glow plugs
The first step is to check the glow plugs for proper operation. Using a multimeter, you can test the resistance of each glow plug to ensure that it is functioning properly.
Check the glow plug control module
Next, you should check the glow plug control module for proper operation. This can be done using a diagnostic scan tool to check for fault codes and monitor the module’s performance.
Check the wiring
Finally, you should check the wiring that connects the glow plugs to the control module. Look for any signs of damage or corrosion that could be causing problems with the circuit.
How to fix the P0672 code
Fixing the P0672 code will depend on the underlying cause of the problem. There are various potential solutions that vary depending on the problem behind the code, so here’s what you can do to fix and remove the code:
Replace faulty glow plugs
If the glow plugs are faulty, the best solution is to replace them. This is a relatively simple fix that can be done by a professional mechanic or a skilled DIYer.
Replace the glow plug control module
If the control module is faulty, it will need to be replaced. This is a more complex fix that should be done by a professional mechanic.
Repair wiring issues
If there is a problem with the wiring, it will need to be repaired or replaced. This is a more complex fix that should be done by a professional mechanic.
Seeking professional help
If you’re not comfortable diagnosing or fixing the P0672 code on your own, it’s best to seek professional help. A skilled mechanic can diagnose and fix the problem quickly and efficiently, ensuring that your vehicle is running smoothly once again.
How to prevent the P0672 code
Properly maintaining the glow plug system can help prevent problems and ensure that the system is functioning properly. This includes checking the glow plugs regularly and replacing them as needed, but there are other ways you can prevent the issue as well:
- Performing routine maintenance
- Using high-quality parts
- Properly maintaining the glow plug system
By doing this, you can save yourself the trouble of having to go through the problem with the code P0672 all over again, which is probably something you didn’t like the first time around.
Our take
By understanding the P0672 code and its causes, you can take steps to prevent it from appearing and fix it quickly if it does. With proper maintenance and attention to the glow plug system, you can keep your vehicle running smoothly and efficiently.
We hope that this guide will help you achieve all of these and also learn something along the way which can be crucial for avoiding such codes in the future.
What are the symptoms of DTC P0672?
Symptoms can include difficulty starting the engine or an illuminated check engine light. In some cases, there may be no noticeable symptoms at all.
Can I still drive my vehicle if it has DTC P0672?
If your vehicle is still running and not experiencing any drivability issues, you may be able to continue driving it. However, it’s best to have it diagnosed and repaired as soon as possible to avoid potential damage to other components.
How is DTC P0672 diagnosed?
A qualified mechanic will use a scan tool to read the code and then perform tests on the glow plug control module and related components to determine the cause of the issue.
