P0673 code — how to fix error fast

While there are a lot of benefits of diesel-powered cars, seeing the code P0673 activated surely isn’t one of them. This code is related to the diesel’s ignition system, but most drivers are unfamiliar with the P0673 code meaning and reasons why it triggers in the first place.

So, our team wanted to help with a complete overview of each of the possible causes, diagnostic methods, and solutions. We’ll give you a clean path so you can figure out a solution for the P0673 code ASAP.

Why you can trust REREV’s OBD2 code advice: Our automotive expert researchers with experienced mechanics undertakes a thorough research methodology to deliver precise insights on OBD codes. Find out more about OBD2 codes research process..

What does the P0673 code mean?

P0673 is a diagnostic trouble code (DTC) that relates to the glow plug control circuit. It is a generic code, meaning that it can be used with any vehicle equipped with an OBD-II system.

The glow plug control circuit is responsible for controlling the glow plugs, which are used to preheat the combustion chambers in diesel engines. When the engine is cold, the glow plugs are activated to help the engine start more easily.

What causes the P0673 code?

There are various possible reasons behind the P0673 code and it takes knowing about all of these to properly deal with the situation at hand. Also, each of these potential causes can have its own unique symptoms that may be present with the code. So, here’s a list for better understanding:

Faulty glow plug

A faulty glow plug may cause the engine to run rough or emit white smoke from the tailpipe. A damaged wiring harness may cause the glow plugs to not receive power, resulting in difficult starting and poor performance.

Faulty glow plug relay

The glow plug relay is responsible for controlling the flow of electricity to the glow plugs, which heat up the engine’s diesel fuel. If this relay is faulty or damaged, it can cause the P0673 code to appear.

Blown fuse

The glow plug circuit relies on a fuse to protect the electrical system from damage. If this fuse blows, it can cause the circuit to fail and trigger the P0673 code.

Wiring issues

Damaged or corroded wiring in the glow plug circuit can prevent proper electrical current flow, causing the P0673 code to appear.

Which car models does the P0673 code affect the most?

The P0673 code can appear in any vehicle that uses glow plugs, but it is more commonly found in diesel engines. These models are particularly susceptible to the P0673 code because they have a high reliance on the glow plug system. Some car models that may be affected by the P0673 code include:

• Ford F-150 Powerstroke: The Powerstroke is a popular diesel engine used in Ford trucks and vans. Glow plug issues are common in these engines, and the P0673 code is often reported.
• Chevy Silverado Duramax: The Duramax is another popular diesel engine used in Chevy and GMC trucks. Like the Powerstroke, glow plug issues are common in these engines and can trigger the P0673 code.

How to diagnose the P0673 code

Once the underlying issue has been identified, the mechanic can then proceed with repairs or replacement of any faulty components. That’s why it’s so important to figure out the cause of the code and here are some of the main ways of doing it:

Using an OBD2 scanner tool

An OBD-II scanner can be used to read the diagnostic trouble codes stored in a vehicle’s computer. This tool can help identify the specific code that is triggering the check engine light, which in this case would be the P0673 code.

Having the glow plug inspected

A mechanic may visually inspect the glow plugs for signs of damage or wear. They may also use a multimeter to test the resistance of each glow plug and compare it to manufacturer specifications.

Checking the glow plug relay

The glow plug relay can be tested using a multimeter to ensure that it is functioning properly. If the relay is faulty, it may need to be replaced.

Checking the fuse box

You can also visually inspect the fuse box and wiring in the glow plug circuit for any signs of damage or corrosion. If there’s a blown fuse, solving the issue can be as simple as replacing it, so that’s always a good check for this code.

How to fix the P0673 code

Fixing the P0673 code may involve several different steps, depending on the underlying cause of the issue. Some of the main ways of fixing this code include:

Replacing faulty glow plugs

If one or more glow plugs are found to be faulty, they will need to be replaced. Glow plugs are relatively inexpensive and can often be replaced quickly by a qualified mechanic.

Repairing damaged wiring

If the wiring in the glow plug circuit is found to be damaged or corroded, it will need to be repaired or replaced. This may involve splicing in new wire or replacing entire sections of the wiring harness.

Replace a blown fuse

If a blown fuse is identified as the cause of the P0673 code, it will need to be replaced with a new one to remove the code.

Replacing the glow plug relay

If the glow plug relay is found to be faulty, it will need to be replaced. This component can typically be replaced relatively quickly and easily by a qualified mechanic.

How to prevent the P0673 code

To prevent the P0673 code from appearing in the future, it is important to properly maintain the glow plug system. This can include:

• Regularly checking and replacing glow plugs as needed
• Inspecting the glow plug relay and wiring for any signs of damage
• Keeping the vehicle’s battery in good condition to ensure proper electrical flow
• Performing routine maintenance on the vehicle’s engine and electrical systems

By taking these preventative measures, the likelihood of the P0673 code appearing can be minimized

Our take

In the end, it turns out that the code P0673 is an easy fix if it’s just caused by faulty glow plugs or blown fuses.. Still, it’s worth checking all the options since your car may not be able to start if you don’t fix the issue causing the code P0673.

In that light, we hope that our team was able to help you out with fixing the code and preventing it from happening again.