If you’ve come across the P0672 code, it means there’s an issue with the glow plug in cylinder 2.
So, what should you do next? First, get an OBD-II scanner to verify the problem code. Once you’ve confirmed it, inspect the glow plug and its wiring.
But don’t stop there—also check the connectors and the relay.
So, how do you do these checks, and what tools will you need? Knowing these details can save you time and prevent more engine issues.
Let’s break down the steps to fix this error quickly.
Key Takeaways
- Replace the bad glow plug in cylinder 2 with a new one to make sure the engine starts properly.
- Check and fix any damaged wires and connectors to ensure a solid and clean electrical connection.
- Test the glow plug relay for continuity and voltage; replace it if it’s not working right.
- Clear the error code using an OBD-II scanner after making the necessary repairs.
Understanding the P0672 Code
The P0672 code means there’s a problem with the glow plug for cylinder 2 in your diesel engine.
This glow plug is important for starting the engine, especially in cold weather. If you see this code, it means the glow plug isn’t heating up properly, which can make your engine hard to start and run less efficiently.
To avoid these issues, regularly check and maintain your glow plugs, wiring, and control modules. Doing so ensures your engine starts easily and performs well, no matter the weather.
Causes of the P0672 Code
Bad glow plugs, damaged wiring, and faulty control modules are the main reasons for the P0672 code.
Over time, glow plugs can wear out, affecting how well a diesel engine runs. Regularly checking and maintaining glow plugs is important to keep them working well, especially in cold weather.
Wiring problems, like corrosion or breaks, can stop the glow plugs from heating up properly. The control module that manages the glow plugs can also fail, causing the P0672 error.
Additionally, bad relays or blown fuses can prevent the glow plugs from turning on.
Fixing these problems quickly ensures your diesel engine runs smoothly and starts easily, even in cold temperatures.
Affected Vehicle Models
When dealing with the P0672 code, it’s helpful to know which vehicle models are most affected so you can identify potential issues in your diesel engine. The Chevy Silverado, Ford F-250, and Dodge RAM are particularly prone to this problem because they use advanced diesel engines.
Specifically, the Duramax diesel engine in the Chevy Silverado, the Power Stroke in the Ford F-250, and the Cummins turbo-diesel in the Dodge RAM often have issues.
- Chevy Silverado 2500 HD: Duramax diesel engines often have problems with the glow plug control.
- Ford F-250 Super Duty: Power Stroke engines frequently have issues with the glow plug circuit.
Other diesel vehicles can also have similar issues.
Symptoms of the P0672 Code
If you’re having trouble starting your diesel engine, especially when it’s cold, it might be due to the P0672 code. You could notice that the engine takes longer to start or doesn’t start at all.
Other signs include the engine running rough or misfiring, more exhaust smoke when you start the engine, and the check engine light coming on.
You might also find that your fuel efficiency drops because the engine isn’t running as smoothly. It’s important to fix these issues quickly to keep your diesel vehicle running well.
Diagnosing the Issue
Diagnosing the Issue
To figure out what’s causing the P0672 code, start by using an OBD-II scanner to see if the code is really there in your car’s system.
Next, try different methods to find the exact problem. Check the glow plug in cylinder 2 for any damage or wear.
- Look at the wiring and connectors: See if there’s any corrosion or breaks that might mess up the circuit.
- Check the glow plug relay: Make sure it works properly to turn on the glow plug.
Checking Glow Plugs
After checking the diagnostic code, the next step is to inspect the glow plugs in cylinder 2.
Use a multimeter to see if they’re damaged or worn out. First, unplug the glow plug’s electrical connector. Set your multimeter to measure ohms, then place the probes on the glow plug terminal and the engine ground. A good glow plug should read between 0.5 and 2 ohms. If the reading is outside this range, you need to replace the glow plug.
Regularly checking your glow plugs helps keep your diesel engine running smoothly and can prevent startup problems, especially in cold weather.
Inspecting Wiring and Connectors
Inspecting the wiring and connectors means taking a close look at each part to see if there’s any corrosion, damage, or loose connections that might mess up the glow plug circuit. Start by looking over the wiring for any visible breaks or fraying. Gently pull on the wires to make sure they’re securely connected. Check the connectors for any signs of rust or wear because corrosion can block the electrical flow.
- Look for any discoloration or rust on the connectors.
- Check if any wires are pinched or have exposed copper.
Pay extra attention to the wiring and connectors, because even small issues can stop the glow plug from working right, causing the P0672 code.
Testing the Relay
When testing the relay, make sure you have a multimeter for accurate measurement of continuity and voltage.
First, unplug the relay from its socket. Use the multimeter to check if there’s a continuous path between the relay’s terminals; this confirms the relay is working.
Next, measure the voltage at the control circuit to ensure it’s within the correct range. If the relay fails either test, it’s a sign that it’s not working properly.
Before deciding to replace the relay, make sure all connections are tight and free of corrosion. Bad relays can mess up the glow plug control circuit, causing the P0672 code.
Always compare your results with the vehicle’s service manual to ensure they’re correct and reliable.
Repair Solutions
To fix the P0672 code, start by replacing the bad glow plug in cylinder 2 to get the glow plug control circuit working right.
Here’s what you need to do:
- Replace the glow plug: Take out the faulty glow plug and put in a new one.
- Check the wiring: Look for and fix any damaged or corroded wires and connectors.
After you finish these repairs, clear the error code using an OBD-II scanner and take a test drive to make sure the problem is fixed.
Doing these repairs right will help your diesel engine run smoothly and efficiently.
Preventive Measures
Regularly taking care of your diesel engine’s glow plugs and related parts will greatly lower the chances of getting the P0672 code.
Start with routine checks by looking at the glow plugs for any signs of wear. Replace them if needed to keep your engine running well.
Also, check the wiring and connectors for any rust or damage, as this can affect how the glow plugs work. Use good-quality fuel to avoid deposits that can hurt performance.
Keep your engine’s battery in top shape because it’s crucial for glow plug activation. Stick closely to the maintenance schedule provided by your engine’s manufacturer.
Spotting starting issues early allows for quick fixes, making sure your engine runs efficiently and preventing the P0672 code from causing problems.
More OBD-II Codes
Frequently Asked Questions
Can Weather Conditions Affect the Occurrence of the P0672 Code?
Yes, weather can impact the occurrence of the P0672 code. Cold weather can make glow plug problems worse, making it harder to start the engine. Make sure your glow plugs are working well to reduce this risk.
Is It Safe to Continue Driving With a P0672 Code?
Think of driving with a pebble in your shoe; it’s uncomfortable and could cause problems. Driving with a P0672 code isn’t safe. It can mess with your engine’s performance, leading to misfires and trouble starting.
How Much Does It Typically Cost to Fix a P0672 Code?
Fixing a P0672 code usually costs between $100 and $300. The price can go up if you need a professional to diagnose the problem or if you have to replace several parts.
Can a P0672 Code Cause Long-Term Engine Damage if Ignored?
Don’t ignore a P0672 code. It can cause your engine to run poorly and use more fuel. If you don’t fix it, you could end up with serious engine damage and expensive repairs later on.
Are There Any DIY Tools Recommended for Diagnosing the P0672 Code?
To diagnose the P0672 code, you can use a diagnostic scanner to confirm the code and a multimeter to test the glow plugs and wiring. These tools help you find the problem quickly and accurately.
Conclusion
You’re now ready to handle the P0672 code. By following these steps, you can quickly find, fix, and prevent future issues.
Don’t let a bad glow plug leave you stranded. Use your OBD-II scanner, multimeter, and inspection skills to keep your engine running smoothly.
After making repairs, clear the code and drive with confidence, knowing you’ve solved the problem.
