How to Fix the P0571 DTC Code on Duramax (Expert Insights)

Having error codes shoved at your car may seem unfair to treat your expensive Duramax. However, you need to know that the code on your Duramax is only there because something is malfunctioning.

So what does the code P0571 mean on Duramax? It simply indicates that your vehicle’s Duramax engine idle cruise control system is malfunctioning. Moreover, which could be caused by the switch connected to the brake pedal.

Hopefully, the reasons above have helped to clear the doubts in your mind. However, you might want to tag along as we’d discuss what the code means in detail, some causes, and possible fixes.

What Does the P0571 Code Mean On Duramax?

As we mentioned earlier, the code P0571 means that the cruise control system is not functioning as it should be, and this sometimes leads to the brakes and the vehicle speed not working correctly.

  • P= Powertrain; is the collection of components that helps the car move forward.
  • 0= this is a generic number primarily based on the SAE standards.
  • 5= vehicle speed control and idle control system.
  • 71= this is a specific fault index that helps further narrow down the problem, representing poor management of the cruise control system.

How Serious Is The P0571 Code On Duramax?

This code, just like any other fault code, is pretty serious. Fault codes are made to warn the driver about a malfunction in the engine. Hence, neglecting false codes could lead to some severe issues.

Since our code suggests that the idle control system is not functioning as it should, you need to understand that it is not always the case.

Sometimes, when the brake pedal and switch connection become weak, this code may pop out along with the check engine light as a safety precaution.

Such issues may not seem significant, but note that once the idle control system stops malfunctioning and becomes completely non-operational due to negligence, it can get cumbersome on the pocket.

Furthermore, a problem with the idle control system would increase the risk of accidents, which is not something to be taken lightly. Such incidents can arise due to sudden brake failures or the Duramax vehicle skidding.

What Causes The P0571 Code On Duramax?

There might be a couple of reasons that lead to this fault code. So far, we only know a few, which tell us how devastating ignoring this code can get, but what about the specific causes that lead us to this problem?

Well, there are a few such causes that help tell us where the problem may originate and help us prevent the code from showing up again. Let’s check them out!

  • Damage to the brake circuit, such as faulty or torn wiring.
  • A faulty connection between the brake switch and the brake pedal.
  • Due to a defective switch, the idle control system buttons.
  • There is a short circuit in the control module of the engine.
  • The wrong brake bulbs were installed by mistake.

How To Fix The P0571 Code On Duramax?

You shouldn’t worry since we’ve got you covered and prepared through a path of steps that might help you resolve the issue by yourself in most cases. Here are the steps!

Step 1: Diagnose the Code Like Mechanic

To be entirely sure that the code is there for a valid reason, you need to be able to diagnose the code just like a trained professional. Use an OBD 2 code scanner to check that the code comes from the engine.

Then clear the code and test drive your Duramax to see if the code immediately shows up. If it does show up, that means the code is valid, and if it doesn’t, then there might be something wrong with the wiring.

Step 2: Test Out The Circuit

One important thing is to check the functionality of the circuit. Hence, you could connect a multimeter to the circuit to test the resistance and continuity for a wrong signal.

Step 3: Inspect Every Corner Of The Engine

The next step is crucial for the complete diagnosis of the engine. You need to check every part of the engine for any sign of tearing, especially the electrical components and the wire connections.

Once you notice that the wiring is good enough, it’s time to up your game by deliberately checking the brake pedals and the brake switches along with the wiring in between them.

Step 4: Fix The Problem You Found Using Relevant Methods

Once you’ve successfully detected the root of the problem itself, you can then go ahead and apply the possible fixes that go along with the specific part that needs fixing.

Suppose, when the issue persists due to faulty wiring, you replace the wires with new ones or tape the wire. Furthermore, if the brake switches or brake pedals cause the problem, replace them with new ones.

Once the issue seems to be resolved, the code vanishes. You might want to give your Duramax a test drive to see if the code pops up again. You’ve officially managed to fix the issue if it doesn’t appear on the screen.

Other Symptoms Of Getting P0571 Code On Duramax?

Several symptoms of code P0571 need to be checked for the good of your Duramax. Hence, along with the brake pedals and switches, there might be other signs. Let’s check them out!

  • The Check-Engine light is always on.
  • The cruise control system becomes almost non-functional.
  • Featcheck-engineSet, Resume, or Acceleration on the Cruise control would have difficulty functioning.
  • The brake doesn’t seem to turn on or glow when the brakes are applied.
  • ABS problems arise with further issues with the brakes of your Duramax.
  • A fuse that has blown off.

How Much Does It Cost To Fix The Duramax P0571 Code?

The cost of repairing this specific code on your Duramax depends mainly on the location you live in or the type of diagnosis route you would pick for your vehicle.

Suppose you decide to cut yourself a little slack and invest in a mechanic for this particular task. Then it might cost you somewhere between $95 and $150 for a complete diagnosis of your Duramax.

Furthermore, replacing the brake light switches typically ranges from $50 to $160.

Can You Drive Your Duramax With Code P0571?

It’s not advisable to drive with the code P0571 on your Duramax engine is not advisable. However, if you decide to still make a mistake for yourself, you’ll only be harming your Duramax.

Hence, it’s always a delight to resolve the issue as soon as the code appears to increase the engine’s longevity.


Hopefully, we’ve been able to convey the importance of fault code to you in the most appropriate way possible. You may know that fault codes should never be neglected, but corrected.

Moreover, this piece of writing consists of everything you need to diagnose and fix the P0571 code error on your Duramax.

We’ve added additional information to give you a sense of fullness and the feeling that nothing was left out. Till then, keep an eye out for error codes and get them resolved on your own.

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