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Troubleshooting the P0380 Duramax Trouble Code

Do you need help with the p0380 duramax? Well, if you’ve detected this P0380 fault code, this means there’s a problem with the glow plug heater circuit.

A glow plug heater circuit mainly provides the required heat for ignition during cold engine temp. But do you know why the code appears and how to fix it?

However, in this write-up, we will discuss all this error code and how you would troubleshoot it. So without any further talk, let’s jump into the discussion.

P0380 Duramax

The P0380 is a powertrain code or, specifically, trouble code. This standard OBD-II trouble code signifies an issue within the glow plug heater circuit A.

The diesel engine of your vehicle won’t start without a glow plug. It generates heat to warm up the cold engine and start fuel combustion.

The PCM detects a voltage variation in the A area when any defect or malfunction occurs. That’s when the error code shows up.

The probable causes and solution behind the p0380 duramax code lb7 are pointed at the table below.

CausesSymptoms
Defective glow plugsExcessive noise during startup
Open fuseExhausting white smoke
Difficulty in starting
Faulty glow plug timerMIL illumination
Inadequate wiring and connectorsPoor acceleration
Defective glow plug moduleMisfiring in the diesel engine
Check engine light warning

Let’s see them in detail.

Defective Glow Plugs

A defective glow plug can’t generate enough heat to warm the engine’s cylinder. So if you have got faulty or dead glow plugs, you will face difficulty starting the engine. Or, even the p0380 duramax no start symptom can also be detected.

In this case, the only solution is to get rid of the old faulty glow plug relay and replace it with a new one.

Open Fuse Or Faulty Fuse In The Circuit

Sometimes, the error code p0380 02 duramax might pop up because of damaged or open fuse, connectors, or wirings. Blown fuses are often associated with the error code and need to be repaired as soon as possible.

 So check out the fuses and figure out the exact problem.

To fix this issue replace or repair the damaged connections and fuses.

Faulty Glow Plug Timer & Module

A defective glow plug timer or a defective glow plug module can also be the reason for showing the 2001 duramax p0380 code.

Replacing the faulty glow plug module or timer is the solution in this case.

Diagnosis Mechanism Of P0380 Code

A detected P0380 trouble code could cause your vehicle not to operate. So, the p0380 duramax fix is required to run your car correctly.

At first, we need to diagnose the P0380 code using a standard OBD-II trouble code scanner. After observing the freeze frame data with a scanner, the mechanic will reset the error code and restart the vehicle. Then check if the trouble code returns or not.

Also Read: P1093 Duramax Error Code And Their Solutions

If the’p0380 duramax circuit ab’ code returns, check the fuses, wires, and other connectors around the glow plug circuit. If any issue is found in the connectors and fuse, replace or repair it.

On the other hand, if the trouble code does not return, the glow plug heater is irregular or intermittent.

Warning

The mechanic must obtain a proper protocol and follow or address the exact trouble code if the technician does not correctly follow the OBD-II error code diagnosis protocol. And this common mistake can lead the issue to more complications.

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Frequently Asked Questions (FAQs)

What is fault code P0380?

The P0380 is a powertrain code or, specifically, trouble code. A standard OBD-II trouble code signifies an issue within the glow plug heater circuit A. The diesel engine of your vehicle won’t start without a glow plug. It generates heat to warm up the cold engine and start fuel combustion.

How do I fix error P0380?

There are several ways to fix the error code P0380. Such as replacing glow plug, glow plug module, timer, damaged wires, and connectors or fuse. But you will need to figure out the exact reason behind this fault code.

How do you fix glow plugs?

The only way to fix the glow plugs is to replace them with a new one. So to replace it, disconnect the cable of the vehicle’s battery at first. Then remove the valve cover, glow plug wires and glow plugs in order. The last step is to insert the new glow plugs and reconnect the cables.

Final Words

That was all about the p0380 duramax error code for the glow plug heater circuit. You can easily checkup your vehicle’s glow plugs with a glow plug tester device. Besides, choosing a suitable glow plug control module is essential to avoid this faulty code repeatedly.

However, if the trouble code pops up, don’t panic at all. It is a prevalent issue among vehicle owners. All it takes is to repair and replace some parts of the diesel engine.

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D Conroy

Meet our senior writer and content manager of Automasterx. He has worked in several mechanical garages and mastered different vehicle diagnoses and parts repair. He never stops until finding out the ultimate solutions for any vehicle fault code. However, ensuring the only solid solutions for each vehicle malfunction is his core part of the duty, alongside analyzing fault codes and signals.

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